Zuo Ye Xing Cheng From LS3 5A Monitoring Bookshelf Speaker Dual 5 Inch Bass Designing

Zuo Ye Xing Cheng From LS3 5A Monitoring Bookshelf Speaker Dual 5 Inch Bass Designing

As a Hi-Fi enthusiast, the legendary LS3/5a is a household name. The BBC LS3/5a is a secondary monitor speaker developed and designed by the BBC, the most authoritative broadcasting company in the UK. It is a masterpiece that spans two centuries. It seems that no speaker can be as good as the BBC's LS3/5a. It caused so much discussion among people. The original design was for in-vehicle monitoring of electronically controlled broadcasts, but the small speaker is like a shoe box but the sound is as gentle as jade. The mid-range is sweet, the treble is rich in detail and not noisy, and the low-frequency can perform well in small environments because of the airtight box. Remarkable and favored by enthusiasts, it has naturally become a benchmark and an immortal legend.

About the design

After a long period of crossover adjustment and listening, we finally made the current product. In addition to being consistent with the original box in terms of size and structure, this product also has very similar sound characteristics. The biggest feature is the design of double bass and composite low-frequency system. The effect is more obvious in the mid-frequency band than the previous version. It extends higher and more delicate than the original box. The low frequency has the same sense of volume and dive. At the same time, the impedance of 4 ohms is also smaller, and an ordinary small power amplifier can be easily pushed up! You don’t need a high-power amplifier to appreciate the “myth” in the audio industry.

Regarding sound performance

 

It is called the world's classic speaker. It has good and delicate high frequency extension, sweet and full mid-frequency, quick expansion and expansion of low frequency, good solidity, and good three-band balance, so you won't feel tired after listening for a long time. Suitable for listening to small-scale music such as vocals, strings, solos, concertos and chamber music. It is particularly good at playing vocals and other types of music, and its closed design is suitable for placement in a wider variety of spaces.

Amplifier matching suggestions

 

Low impedance, low sensitivity, dual large-diameter pure aluminum voice coils, low power amplifier control and requirements. The recommended power for Class A and tube amplifiers is 5-10W or more, and the recommended power for transistor amplifiers is 50W or more. More suitable for listening in spaces of 8-35 square meters. (It is recommended to pair it with an amplifier with deep low-frequency penetration, the effect is unexpectedly good!)

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LS3/5a Finished Speaker 1 Pair Double Bass Units Built-in 25W 50～20kHz Sealed Enclosure Crosspoint 3K

Jiu Meng He Chu Xun from Tube amplifier with switch power supply

Jiu Meng He Chu Xun from Tube amplifier with switch power supply

The song is Jiu Meng He Chu Xun by Teresa Teng , playing by CD player +Tube amplifier with switch power supply 

The song Farmer from Mark HIFI 5.25 Inch Full Range Speaker Unit Metal Cone

The song Farmer from Mark HIFI 5.25 Inch Full Range Speaker Unit  Metal Cone

It uses a 25mm coil and a 90mm super magnet to ensure sufficient energy and achieve a rich and full low frequency volume. This speaker has an amazing high frequency of 28KHz and a low frequency resonance frequency of 43Hz. This is a true full-range speaker. Mark's consistent control technology for metal basins has rich and delicate vocals, not noisy or irritable, suitable for long listening. For those users who require rich details, great dynamics, and clear and pure hearing, this speaker is very suitable.

Actually listen to the Yanhuang drum, dust drum, etc., immediately shock the low frequency attack, which is absolutely beyond your understanding of the same size speakers; the high frequency is clear and transparent, such as Gu Zheng, violin and other string music, precise and vivid

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Mark HIFI 5.25 Inch Full Range Speaker Unit  Metal Cone

HIFI 2 Inch Full Range Speaker Unit for Computer Speakers

This is a 2-inch full range speaker, its cone adopted flax fiber plus wool, focused on middle frequency and treble, of course, its bass is emphasis point. It is very suitable for making small desktop speakers, the speaker unit’s middle frequency is special thick and mellow, low frequency flexible, high frequency can be extended to 20KHz, which is a good choice used to upgrade computer speakers, because of its high sensitivity, amplifier with 8W-15W can easily push it. It is a very rare full range speaker unit.

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HIFI 2 Inch Full Range Speaker Unit for Computer Speakers

IWISTAO Car External Midrange Speaker High-Quality 2.5-Inch HIFI Speaker for Front Surround and A-pillar Modification

IWISTAO Car External Midrange Speaker High-Quality 2.5-Inch HIFI Speaker for Front Surround and A-pillar Modification

Enhance your car audio experience with the this Car External Midrange Speaker, designed for easy installation and impeccable sound quality. Crafted with precision from cast aluminum, this speaker unit is ideal for upgrading your car's audio system, serving as both a car external midrange speaker and a front surround speaker. Simply secure it in place using double-sided tape and enjoy a significant improvement in audio performance.

 

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IWISTAO Car External Midrange Speaker High-Quality 2.5-Inch HIFI Speaker for Front Surround and A-pillar Modification 

Hotel California from IWISTAO 4 Inches Full Range Transparent Labyrinth Speaker

If you are looking for a speaker that can deliver clear and immersive sound quality, you might want to check out the 4 Inches Full Range Transparent Labyrinth Speaker.

This speaker is designed with a unique labyrinth structure that enhances the bass performance and reduces distortion. The transparent acrylic material allows you to see the inner workings of the speaker and adds a touch of elegance to your decor.

It built in  a 4-inch full-range driver that can handle a wide range of frequencies and produce balanced and natural sound. Whether you are listening to music, watching movies, or playing games, you will enjoy the rich and detailed sound from this speaker.

The speaker is compact and lightweight, making it ideal for carrying around or placing on any surface. The 4 Inches Full Range Transparent Labyrinth Speaker is a great choice for anyone who appreciates high-quality sound and stylish design.

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IWISTAO SHIFI 4 Inches Full Range Transparent Labyrinth Speaker 1 Pair 60Hz-23KHz 92dB Max AKISUI4 for Monitor Speakers For Tube Amp

IWISTAO HIFI 4 Inches Full Range Speaker Heighten Empty Labyrinth Cabinet

This speaker cabinet is made of solid wood. Built-in a labyrinth structure, its height has been increased, then its transmission line channels will become longer, can enhance the low-frequency radiant energy, make low-frequency dive deeper, effectively overcoming insufficient bass of commend full range speaker cabinet, make the speaker cabinet the full-frequency be more full and rich.

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IWISTAO HIFI 4 Inches Full Range Speaker Heighten Empty Labyrinth Cabinet 1 Pair for Tube Amplifier

IWISTAO 2X30W HIFI Amplifier Stereo LM1875 Power Amp Desktop With Preamp OP TL084 Independent Rectifier

IWISTAO 2X30W HIFI Amplifier Stereo LM1875 Power Amp Desktop With Preamp OP TL084 Independent Rectifier

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IWISTAO 2X30W HIFI Amplifier Stereo LM1875 Power Amp Desktop

You Jian Chui Yan from a Walkman Headphone Output Antiques Strong Analog Taste

You Jian Chui Yan from a Walkman Headphone Output Antiques Strong Analog Taste 

Teresa Teng's "Seeing the Cooking Smoke Again" is a song that evokes warmth and sentimentality. Whenever I listen to this song, it takes me back to the past and reminds me of the simpler times.

In today's fast-paced society, finding a moment to relax can be challenging. However, when you listen to Teresa Teng's "Seeing the Cooking Smoke Again" on your Walkman, you can transport yourself back to a time of innocence and warmth.

The lyrics in this song capture the beauty and simplicity of that era. Lines like "Seeing the smoke from the kitchen again, in front of the gate of my hometown" evoke memories of childhood and hometowns. This feeling is difficult to put into words but can be experienced through music.

Teresa Teng's "Seeing the Cooking Smoke Again" is more than just a song; it is a source of emotion and memory. Whenever you listen to this song, you will feel its warmth and emotional impact. Let us take a moment to reminisce about the good old days, and let Teresa Teng's voice accompany us through every day.

IWISTAO HIFI 2 Way 6.5 Inch Bookshelf Solid Wood Empty Speaker Cabinet Double Cut Corner 19L

IWISTAO HIFI 2 Way 6.5 Inch Bookshelf Solid Wood Empty Speaker Cabinet  Diamond Double Cut Corner 19L for Tube Amplifier

This is a pair of 2-way bookshelf solid wood empty speaker cabinet with dovetail structure and diamond double cuts corner, and its outside is a original wood color plus varnish red-brawn as the photos showed.

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IWISTAO HIFI 2 Way 6.5 Inch Bookshelf Solid Wood Empty Speaker Cabinet  Diamond Double Cut Corner 19L for Tube Amplifier

What is a SDR radio?

SDR (Software Defined Radio) is a software-based radio technology that uses digital signal processing and computer software to receive and process radio signals. While traditional radios use fixed hardware circuits to receive and decode radio signals, SDR uses general-purpose hardware devices, such as computers or dedicated SDR receivers, and software to perform the tasks of signal processing and decoding.

The main advantage of SDR technology is its flexibility and configurability. Traditional radios require specially designed and manufactured hardware circuits for specific frequency ranges and modulation schemes. The SDR can adapt to different frequency ranges and modulation methods by changing the software configuration, so as to realize the flexibility of various radio applications, including radio broadcasting, amateur radio, radio communication, etc.

SDR radios can receive and decode signals of various modulation methods, such as amplitude modulation (AM), frequency modulation (FM), single sideband (SSB), etc. It can also provide high-quality audio output and allow users to adjust and process the received signal through the software interface, such as frequency selection, gain control, noise reduction, filtering, etc.

Another important advantage of SDR radios is their ability to perform digital signal processing. The signals received by traditional radios are processed by analog and output audio signals, while SDR can process and analyze the received signals at a higher level through digital signal processing. This enables the SDR radio to implement some advanced functions, such as signal identification, spectrum analysis, digital decoding, etc.

All in all, SDR radio is a radio receiving device implemented using software-defined technology, which has the advantages of flexibility, configurability and digital signal processing, and can receive and process various radio signals.

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Full-band Full-mode SDR Radio Software radios Multi-function FM 3.5 Inches IPS LCD Screen Built-in 2500mAh Lithium Battery

Liang Zhu from IWISTAO 2X40W FU29 Pull Push Vacuum Tube Amplifier

Liang Zhu from IWISTAO 2X40W  FU29 Pull Push Vacuum Tube Amplifier 

"The Butterfly Lovers Violin Concerto"  often abbreviated as "The Butterfly Lovers" or "Liang Zhu". 

We played it with FU29 pull-push vacuum tube amplifier.

This FU29 vacuum tube named FY29 in Russian, and named 829B in American. It is a composite vacuum tube in which two Cambodian tetrodes are packaged in a same glass shell. It is generally used in power amplifiers with push-pull output, which can reduce tube selection and matching trouble. FU29 filament voltage is 6.3V, current is 2.25A, screen voltage is 600V, curtain grid voltage is 200V, zero letter screen current is 40mA, full letter current is 110mA. The grid bias voltage is -18V, the optimal load impedance from the screen to the screen grid is 13750Ω, and the output power (effective value) reaches 44W when the signal is full.

In order to further simplify the circuit, this unit uses a composite tube 6N2 for preamplification and phase inversion, so that a single channel can use 6N2 and a FU29 to complete the power amplifier task, and it has 40W power output. It is small in size, unique in shape, but strong in driving force. Do not use the power of general transistors or digital power amplifiers to analogize the actual driving force of this tube power amplifier, because the high supply voltage and unique output transformer’s structure, its output internal resistance change for high and low frequency signals is relatively small, and it has a good low frequency driving ability. And the sound is soft and smooth, warm and delicate. This is why the tube amplifier has not been completely replaced after the emergence of many new technologies.

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IWISTAO 2X40W Vacuum Tube Amplifier Pull Push FU29 Power Stage 6N2 Preamp Bluetooth 5.0 Whole Aluminum Chassis

What is an exponential and a hyperbolic Horn?

An exponential horn is a type of acoustic horn that has an exponential flare rate. This means that the cross-sectional area of the horn increases exponentially from the throat to the mouth. A horn with a flare constant of 1.0 is a true exponential horn, while a flare constant less than 1.0 is a hyperbolic horn. The details as below.

The formula is as follows,

m and fc (cutoff frequency Hz), c (speed of sound 34400mm/s)

Correlation In the case of the hyperbolic horn, the formula is

So, the specific calculation is more complicated, so I won’t go into details. Interested friends can do their own research, and here are so many, the main purpose is to show that the horn is not simply stacked with several boards, make a radian, and then seal a board on the left and right. It will work.

Therefore, the size of the horn is also fixed, and it does not support changing it to be larger or smaller.

The exponential horn has an acoustic loading property that allows the speaker driver to remain evenly balanced in output level over its frequency range.

An exponential horn works by increasing the overall efficiency of the driving element. The shape of the horn allows for a controlled cross-section increase, resulting in an impedance match between the sound source and the surrounding air. This means that an acoustic horn can radiate sound efficiently in a large frequency range. Efficient radiation is obtained when the pressure is in phase with the particle velocity, which requires a large surface at lower frequencies . The exponential flare rate of the horn helps to maintain an even output level over its frequency range.

The benefits of using an exponential horn include increased efficiency and improved output level balance over its frequency range. The exponential flare rate of the horn helps to maintain an even output level over its frequency range, allowing the speaker driver to remain evenly balanced in output level. This can result in greater acoustic output power from a given driver. Additionally, the shape of the horn allows for an impedance match between the sound source and the surrounding air, which can result in more efficient radiation of sound in a large frequency range.

An exponential horn is different from other types of horns in the way its cross-sectional area increases from the throat to the mouth. The flare rate of an exponential horn is exponential, meaning that the cross-sectional area of the horn increases exponentially from the throat to the mouth. This is in contrast to other types of horns, such as hyperbolic-exponential horns, which have a flare constant less than 1.0 and flare more suddenly at their mouth . The exponential flare rate of an exponential horn helps to maintain an even output level over its frequency range, allowing the speaker driver to remain evenly balanced in output level.

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IWSITAO Customized 1 Pair TAD TH4001 Hyperbolic Stable Diffusion Empty Wooden Horn 2 Inches Throat Birch Plywood Wide 612MM with Adapter

IWSITAO Customized 1 Pair Hyperbolic Stable Diffusion Empty Wooden Horn 1 Inch Throat Birch Plywood Wide 400MM with Adapter

R Core Transformer for Vacuum Tube Amplifier

R core transformer is a type of transformer that uses a ring-shaped core made of cold-rolled grain-oriented silicon steel, and the cross section is round, like O core transformer It has many advantages over conventional transformers, such as low noise, low loss,  low flux leakage, low no-load current, high efficiency, and compact size.  R core transformer is a kind of copper saving transformer, needs less copper for each turn. Its explosive power in audio better than toroidal transformer. The bobbins of R core transformer are made of PBT plastic, which has a strong dielectric strength and fire resistance. 

R core transformer is widely used in industrial control, home appliances, hi-fi audio equipment, signal equipment, office device, communication apparatus, test instrument and medical instrument. In this blog post, I will introduce the basic structure and working principle of R core transformer, and explain some of its applications and benefits.

The R core transformer consists of two parts: the R core and the winding. The R core is a continuous ring-shaped core that has no air gap or cut. 

The winding is wrapped around the R core in a spiral manner, forming two coils: the primary coil and the secondary coil. The primary coil is connected to the input voltage source, and the secondary coil is connected to the output load. OFC(Oxygen Free Copper) copper wire applied in R core transformers, OFC has no hydrogen embrittlement, and has a high conductivity. It is commonly used in audio equipment, vacuum electronic components, wire and so on.

The working principle of R core transformer is based on the phenomenon of electromagnetic induction. When an alternating current flows through the primary coil, it generates a magnetic flux in the R core. The magnetic flux induces an electromotive force in the secondary coil, which produces an output voltage. The ratio of the output voltage to the input voltage depends on the number of turns of the coils. The more turns the secondary coil has, the higher the output voltage.

One of the main advantages of R core transformer is that it has low noise. Because the R core has no air gap or cut, it does not produce any mechanical vibration or humming sound when working. This makes it suitable for applications that require quiet operation, such as audio equipment, medical devices, and communication systems.

Another advantage of R core transformer is that it has low loss. The R core has high magnetic permeability and low hysteresis loss, which means it can efficiently transfer the magnetic flux from the primary coil to the secondary coil. The winding also has low resistance and low leakage inductance, which reduces the heat generation and power loss. As a result, R core transformer has high efficiency and low temperature rise.

A third advantage of R core transformer is that it has compact size. The R core has a simple and symmetrical shape that can fit into a small space. The winding also has a uniform distribution and a small diameter, which reduces the volume and weight of the transformer. This makes it easy to install and transport.

R core transformer is a versatile and reliable device that can be used for various purposes. Some of its applications include power supply, voltage regulation, isolation, impedance matching, signal transmission, and filtering. It can also be customized to meet different specifications and requirements.

There is a R core transformer, which is developed for vacuum tube preamplifier specially. Its primary voltage is AC 0-115V-230v, and its secondary voltage are dual 220V and dual 6.3V.

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IWISTAO R Type Transformer 35W Input 0-115V-230V Dual 220V 6.3V Tube Amp Preamp

How to Build a Center Speaker Cabinet with 2 Full Range Speaker Units

If you are looking for a DIY project to improve your home theater sound system, you might want to consider building your own center speaker cabinet. A center speaker is responsible for delivering most of the dialogue and sound effects in movies and TV shows, so it is important to have a good one that matches your left and right speakers. In this blog post, we will show you how to build an empty center speaker cabinet with 2 full range speaker units, which are speakers that can reproduce a wide range of frequencies without the need for tweeters or woofers.

The first step is to choose the speaker units that you want to use. There are many options available online or in local stores, but make sure they have the same impedance and power rating as your other speakers. You also need to check the dimensions and mounting holes of the speaker units, as they will determine the size and shape of your cabinet. For this example, we will use two 4-inch full range speaker units that have an impedance of 8 ohms and a power rating of 15 watts each.

The next step is to design and cut the cabinet. You can use any material that is sturdy and acoustically inert, such as MDF, plywood, or solid wood. You need to cut six pieces: a front panel, a back panel, two side panels, a top panel, and a bottom panel. The front panel should have two circular holes that match the diameter and position of the speaker units. The back panel should have a rectangular hole for the speaker wire terminal. The other panels should be plain. The dimensions of the panels depend on the size of your speaker units and your personal preference, but for this example, we will use these measurements:

- Front panel: 12 x 6 x 0.75 inches

- Back panel: 12 x 6 x 0.75 inches

- Side panels: 6 x 5 x 0.75 inches

- Top panel: 12 x 5 x 0.75 inches

- Bottom panel: 12 x 5 x 0.75 inches

The third step is to assemble and finish the cabinet. You can use wood glue, screws, or nails to join the panels together, making sure they are aligned and flush. You can also add some damping material inside the cabinet, such as acoustic foam or fiberglass, to reduce unwanted vibrations and improve the sound quality. You can then paint or stain the cabinet to match your decor or leave it natural if you prefer. You can also add some rubber feet or spikes to the bottom of the cabinet to isolate it from the floor.

The final step is to install the speaker units and wire them up. You can use any speaker wire that is compatible with your amplifier or receiver, but make sure it is long enough to reach your desired location. You need to connect the positive terminal of one speaker unit to the positive terminal of the other speaker unit, and then connect them to the positive terminal of the speaker wire terminal. Similarly, you need to connect the negative terminals of both speaker units to the negative terminal of the speaker wire terminal. You can then mount the speaker units on the front panel using screws or bolts, and attach the speaker wire terminal on the back panel using screws or nuts.

You have now completed your DIY center speaker cabinet with 2 full range speaker units! You can place it on a shelf or a stand below or above your TV screen, and connect it to your amplifier or receiver using a single speaker wire. You can then enjoy a more immersive and realistic sound experience in your home theater!

Now, we offer several models for empty center speaker cabinet, then you don't need to build it by yourself, you just buy one of them and fix it.

IWISTAO HIFI Full Range Speaker Empty Cabinet CenterLabyrinth Speaker 3~4 Inch MDF 

IWISTAO 4-inch Double Bass Treble Center Speaker Empty Enclosure Birch 5.1 Home theater 12L

IWISTAO 2 Way 6.5 Inches Center Speaker Empty Cabinet Speaker Enclosure 15mm High Density Board

Why should a toroidal transformer be shielded?

A toroidal transformer is a type of transformer that has a doughnut-shaped core made of ferromagnetic material. Toroidal transformers have several advantages over conventional transformers, such as higher efficiency, lower weight, and smaller size. However, they also have some drawbacks, such as higher cost and higher leakage flux.

Leakage flux is the magnetic flux that escapes from the core of the transformer and induces currents in nearby conductors. This can cause interference, noise, and heating in the surrounding circuits and devices. To prevent this, a toroidal transformer should be shielded with a metal enclosure that blocks the leakage flux and reduces its effects.

Shielding a toroidal transformer can also improve its performance and safety. By reducing the leakage flux, the shielding can increase the coupling between the primary and secondary windings, which improves the voltage regulation and reduces the losses. Moreover, the shielding can protect the transformer from external magnetic fields that could saturate the core and cause overheating or damage.

Enclose the transformer in an magnetic shield enclosure to make sure it has much lower flux leakage. this kind of transformer has not only a good appearance but also high performance. It effectively reduced the magnetic flux interference to other components. And it is suitable for hi-end audio system.

There is a toroidal transformer shielded, which is developed for vacuum tube preamplifier or headphone amplifier specially. Its primary voltage is AC220v, and its secondary voltage are 170V and dual 3.15V.

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IWISTAO 60W Toroidal Transformer Dedicated Filling Glue Tube Preamp Headphone Amp AC170V 3.15V

The song Angel from 6F3 drive 300B Vacuum Tube Amplifier

Vacuum tube 300B is a mysterious vacuum tube with a long history, and don’t know how many music fans are fascinated. I still don’t know how many people are struggling to find its real voice. The audiophiles think that 300B is a female voice representative. But our 300B kit circuit is the embodiment of the sound of rigidity and softness. It is not only an attentive and charming woman, but also an iron and tender prince charming.

There are also rumors that the low frequency of 300B is not good. From an electrical point of view, the internal resistance of 300B is only about 800 ohms, which shows its damping coefficient is very good. Why is the rumors so? This is depended on the quality of the power supply, time constant of the circuit design and other reasons.

 

In fact, 300B tube is the best way to reflect the original atmosphere of music, because the tube’s characteristic curve distribution is excellent, coupled with second-harmonic sense of hearing, the mouth shape of the singer, the low-frequency tension of the chest resonance, its dynamics can be said to reach the perfect state, if regardless of the power, hundreds of thousands of transistor world-famous machines are difficult to surpass in the same power range as the 300B. From the acoustic point of view, the sound of the 300B tube amplifier is more expressive and richer, musical sense.

 

Our vacuum tube 300B kit has a unique acoustic and electrical regulatory concepts from the design to the selection of the output transformer.

The vacuum tube 6F3 is a relatively unpopular composite tube, which is quite a 12ax7+6p14 inside. Because of the large inventory, the price is related low, but its performance is extremely excellent, especially when it is connected as triode tube, which output internal resistance is particularly low, and linearity is good, driving 300B is absolutely no problem. In addition, many senior enthusiasts will inevitably ask, why use large loop feedback? This is our consideration of sound and stability. The large loop will sacrifice the transparency of mid and high frequencies. However, in order to improve the weakness of the low frequency of the tube, adopt the large loop can will make the internal resistance of the 300B tube amplifier lower, so that its overall sound balanced.

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Finished Vacuum Tube Amplifier:

IWISTAO Single-ended Tube Amplifier Tube Amplifier Mono-block Integrated West Electric Master 2x8W Vacuum Tube 6F3 Drive 300B 5Z2P Rectifier

DIY Vacuum Tube Amplifier Kits:

Vacuum Tube Amplifier 300B Kit Single-ended Class A No soldering 6F3 Preamplifier DIY Kits HIFI

What is an O core transformer?

An O core transformer is a type of toroidal transformer that has a circular cross section and no sharp corners. It is different from a regular toroidal transformer, which has a square or rectangular cross section. The advantage of an O core transformer is that it has less flux leakage and less copper loss than a regular toroidal transformer, because it has a shorter mean length of turn (MLT) and less insulation material. An O core transformer also has the same electrical benefits as a regular toroidal transformer, such as low noise, low stray field, high efficiency and compact size.

An O core transformer is made from grain oriented silicon steel, which has high permeability and low core loss. The steel strip is continuously pointed towards each end to produce a circular cross section. The transformer core is then wound with primary and secondary coils over the core. The winding process is similar to that of a regular toroidal transformer, but it requires more precision and skill.

O core transformers are suitable for applications that require a low profile and a high power rating. They can be used for power supplies, audio amplifiers, medical equipment, lighting systems and other devices that need reliable and efficient power conversion.

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IWISTAO 150W O Type Transformer 4N OFC Dual 18V or 22V 15-0-15V for DAC Preamp Headphone Amplifier

DIY Your Car Subwoofer with IWISTAO Empty Subwoofer Cabinet

DIY Your Car Subwoofer with IWISTAO Empty Subwoofer Cabinet 

Do you find yourself disappointed with the lackluster audio quality in your car? Want to experience the full power of your music while you're driving? Look no further than a car subwoofer!

A car subwoofer is an essential component of any high-quality car audio system. It is designed to reproduce low-frequency sounds like bass and drums, which can often be lost in a car's interior acoustics without proper equipment. With a subwoofer, you can bring your music to life and truly feel the beat of your favorite songs.

Installing a car subwoofer is a straightforward process that can be done in just a few steps. You can choose to have it professionally installed, or you can do it yourself with some basic knowledge of car audio systems. Once installed, you'll immediately notice a difference in the audio quality of your car. The bass will be deeper, more pronounced, and more satisfying.

Whether you're a music enthusiast or just someone looking to upgrade your car's audio system, a car subwoofer is definitely worth the investment. You'll be amazed at the difference it can make in the quality of your music and your overall driving experience. Don't settle for lackluster audio any longer. Upgrade to a car subwoofer and take your music to the next level!

For those who enjoy DIY projects, you can purchase a passive subwoofer empty speaker cabinet and fix your favorite bass unit into the cabinet. The board of this woofer is made of high-density board with a honeycomb structure, effectively eliminating standing sound. The outer surface of the speaker is pasted with black PVC leather, and the front panel is made of three-layer HDF boards. Enjoy the fun of customizing your car audio system to your preferences!

There are two types for the empty cabinet, one is inverted hole on the side, and the other is sealed one.

Inverted hole on the side

Or 

Front Inverted Holes

Sealed Empty Cabinet

After fixed the driver

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IWISTAO HIFI 8 / 10 /12 Inch Passive Subwoofer Empty Cabinet Honeycomb HDF Board Enclosure Sealed Box Car Audio DIY

IWISTAO HIFI 8 / 10 /12 Inch Passive Subwoofer Empty Cabinet Honeycomb HDF Board Enclosure Sealed Box Car Audio DIY

What is a pull-push output transformer?

What is a pull-push output transformer?

Output transformers are a crucial component of many electronic devices, particularly in audio equipment. An output transformer's role is to match the load impedance, such as a loudspeaker, to the amplifier output impedance. Different types of output transformers have their own advantages and disadvantages. In this article, we will focus on pull-push output transformers.

A pull-push output transformer is a type of transformer used in push-pull amplifiers. In a push-pull amplifier, two transistors or vacuum tubes are used, each handling half of the signal. The pull-push output transformer is designed to combine the signal from both halves of the amplifier into a single output.

The term "pull-push" refers to the way the output transformer is wired. In a pull-push output transformer, the two halves of the transformer are wired in opposite directions. One half of the transformer "pulls" the current, while the other "pushes" the current. This cancels out any magnetic fields generated by the current flowing through the transformer, resulting in a cleaner output signal.

One of the primary advantages of a pull-push output transformer is that it can handle higher power levels than other types of output transformers. The push-pull configuration allows the use of two output devices, each handling only half of the signal. This reduces the amount of power each device needs to handle, allowing for higher power output without the risk of damaging the output devices.

Another advantage of pull-push output transformers is that they can provide a balanced output. A balanced output is important in audio applications because it helps to reduce the amount of noise and interference in the signal. By using a pull-push output transformer, the signal is split into two equal parts, with each half being inverted from the other. This creates a balanced signal that is less susceptible to noise and interference.

In addition to these advantages, pull-push output transformers are also relatively easy to design and build. They can be constructed using standard transformer winding techniques, and there are many commercially available options for those who don't want to build their own.

However, there are also some disadvantages to using pull-push output transformers. One of the main drawbacks is that they can be more expensive than other types of output transformers. This is because they require more winding wire and more complex winding techniques.

Another potential disadvantage of pull-push output transformers is that they can be more challenging to tune. The balanced output requires precise matching of the two halves of the transformer, which can be challenging to achieve.

In conclusion, pull-push output transformers are a popular choice for high-power audio amplifiers due to their ability to handle high power levels and provide a balanced output. Although they may be more expensive and challenging to design and tune than other types of output transformers, their advantages make them a popular choice for many audio enthusiasts and professionals.

Now, some people asked us what is P1, G1, B+, P2, and G2 of a pull-push output transformer?

The terms P1, G1, B+, P2, and G2 are commonly used to describe the winding connections of a push-pull output transformer in a vacuum tube amplifier. These connections are similar to those used in a pull-push output transformer, but the naming convention is slightly different. Here is a brief explanation of what each term means in a vacuum tube push-pull output transformer:

P1 and P2: These are the primary windings of the transformer. P1 is connected to the plate of one vacuum tube, while P2 is connected to the plate of the other tube. The primary windings are where the amplified signal is applied.

G1 and G2: These are the center-tap connections of the primary windings. They are used to provide a balanced output signal. G1 and G2 are usually connected to ground in the amplifier circuit.

B+: This is the high-voltage power supply connection of the transformer. It is where the high voltage DC power supply is connected to power the vacuum tubes.

There are some examples as below, in order to understanding well. This diagram is for 2x25W pull-push vacuum tube amplifier, and for EL84, 6P1 tubes.

2X25W EL34 pull-push vacuum tube amplifier

EL84 pull-push vacuum tube amplifier

6P1 pull-push vacuum tube amplifier

Audio Note EL84 Pull Push Tube Amplifier

4.5 Inches Labyrinth Speaker Solid Wood Cabinet with Bose Model 100 PR Unit

4.5 Inches Labyrinth Speaker Solid Wood Cabinet with Bose Model 100 PR Unit

The Bose Model 100 PR was a highly sought-after speaker in the last century and many of them are still in good condition today. We have repurposed these units and integrated them into our custom-designed labyrinth speaker cabinet.

We have demonstrated the performance of these speakers in a video. Additionally, we offer empty 4.5-inch speaker cabinets for sale. You can purchase the Bose Model 100 PR units locally and install them in the cabinets with the pre-cut panels we provide.

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IWISTAO HIFI Speaker Empty Cabinet 4.5 Inches 1 Pair Labyrinth Structure with Solid Wood for Bose Model 100 PR Unit DIY