What is Ture Wireless Stereo?

What is Ture Wireless Stereo?

It is connected with the main speaker through smartphone, and then the main speakers connect s with the slave speaker via a Bluetooth wireless mode connection, to achieve true wireless Bluetooth for left and right channels separated of Bluetooth speaker.The program based on CSR Bluetooth4.0 with dual-mode module development.  When not connected to the speaker, the main speaker stereo back monomers. It is no delay, and good sound quality. Designed to provide customers with stable performance characteristics of high-end Bluetooth loud speaker programs. It need 2 pcs Bluetooth modules with TWS function to realize it as below. 

1. Apply to: high-end Bluetooth stereo speakers
2. Bluetooth module: CSR8670, CSRA64000 series Bluetooth 4.0 dual-mode
3. Bluetooth protocol: music playback (A2DP), streaming media control (AVRCP), Handsfree (HFP), serial data transmission (SPP), etc.
4. Functions: on / off, volume control, pause / play, previous song, next song, incoming calls, call transfer, call reject, redial the bottom, hang up, etc.
5. Additional features: UART data communication, display power in iphone mobile phone, caller ID, phone book synchronization, mobile phone anti-lost (no extra cost), call echo cancellation (CVC) APT-X audio formats to cable (registration) (need to pay an additional license fee)
6. Special features: 6 touch control keys
7. The input and output functions: analog audio, PCM digital synchronization, I2S, SPDIF, HDMI, optical fiber, etc.

Bluetooth Chips CSRA64000 Series Devices Comprision

Bluetooth Chips CSRA64000 Series Devices Comprision

It supports TWS, I2S, APTX，Low-cost support TWS, I2S, APTX Bluetooth module CSR64215 program, CSR low-cost True Wireless (TWS)  that CSRA64000 series Bluetooth stereo speaker module program. The series include CSRA64110, CSRA64210, CSRA64215 chip.

Product description:
1. Bluetooth V4.2 + EDR standards
2. RF power level Class II
3. Support A2DP1.3, AVRCP 1.5, HFP1.6 (includes support for WBS and mSBC), HSP1.2 protocols
4. Using CSR's latest sixth generation of CVC speech enhancement and noise 5. reduction echo cancellation technology implementation
5. Support multipoint connection (to connect two mobile application for voice and music connection)
6. Support CSR Secure simple pairing, Proximity pairing and CSR Proximity connection
7. Supports user-definable features multilingual Voice promote
8. Supports voice answer / reject a call
9. Support SBC, MP3, AAC, APTX APTX-LL audio formats
10. Leads to a variety of interfaces: PIO / UART / SPI / AIO / SPK / MIC / USB
11. Built-in 16-bit stereo codec, DAC SNR up to 95dB
12. Support TWS (left and right channel separation)
13. Supports I2S output
14. Built-DC converter power management
15. Integrated lithium battery charging function, the maximum charge current up to 400mA
16. Small surface mount package: 20 * 13 * 2.2mm
17. RoHS lead-free production process


Main comprsion

Applications

1. High quality wireless stereo headset

2. Hi-fi, sound

3. Having a wireless hands-free echo cancellation

4. Bluetooth Car Audio & Video

A HIFI Wireless Bluetooth 4.0 Decoder with CSR8670 and AK4490

A HIFI Wireless Bluetooth  4.0 Decoder with CSR8670 and AK4490

Currently more Bluetooth receivers had hit the market, but it just a Bluetooth receiver only that can receive and output signal quality is similar with CD level when its audio soucing is enough better like as lossless format.

Do you need more high solutiong wireless Bluetooth decoder? It should be better than those Bluetooth receiver. Now, we developed a Bluetooth Decoder, which is based on Bluetooth 4.0 CSR 8670 and DAC AK4490. It had been hit market.

CSR8670 is one of the most stable, best Bluetooth chip, supports APT-X transmission. And  AK4490 is a new generation Premium 32-bit 2ch DAC with new technologies, achieving industry’s leading level low distortion characteristics and wide dynamic range. The AK4490 integrates a newly developed switched capacitor filter “OSR Doubler” that greatly reduces sound degradation from noise shaping, achieving a flat noise floor up to 200kHz. An innovative design technique utilizing a symmetrical layout for the left and right channels prevents signal quality deterioration, and a 32-bit digital operation block provides full 32-bit processing, making it capable of supporting wide range signals and achieving low out-of-band noise while realizing low power consumption. Moreover, the AK4490 has five types of 32-bit digital filters, realizing simple and flexible sound tuning in wide range of applications. The AK4490 accepts up to 768kHz PCM data and 11.2MHz DSD data, ideal for a high-resolution audio source playback that are becoming widespread in network audios, USB-DACs and Car Audio Systems.  

It is a high performance 32-bit stereo DAC that achieves industry leading level performance of THD+N (-112dB) for a voltage output with 120dB dynamic range. It is a member of the Audio 4 ProTM family that adopts a newly developed VELVET SOUNDTM technology and is the flagship product of a new generation 32-bit premium DAC called VERITA series. 

If do you think that  the perfotmance of this Bluetooth decoder is far better than normal Bluetooth receiver?  Actully, it is ture... The Bluetooth 4.0 version CSR8670 of the unit implemented digital signal transmission thought wireless function, the digital to analog conversion of audio output used a professional decoder chip AK4490 to play that the digital signal is decoded into an analog audio signal, and finally OP amplified the analog audio signal and output it. 

HIFI Wireless Decoder with Bluetooth 4.0 CSR8670 and AK4490

HIFI Wireless Decoder with Bluetooth 4.0 CSR8670 and AK4490

HIFI Wireless Decoder with Bluetooth 4.0 CSR8670 and AK4490

HIFI Wireless Decoder with Bluetooth 4.0 CSR8670 and AK4490

Back View of HIFI Wireless Decoder with Bluetooth 4.0 CSR8670 and AK4490

Back View of HIFI Wireless Decoder with Bluetooth 4.0 CSR8670 and AK4490

Inside View of Wireless Decoder with Bluetooth 4.0 CSR8670 and AK4490

DAC AKM AK4490

OPA2604AP

 one of the most stable, best Bluetooth chip, supports APT-X transmission

At the same time, the unit is compatible with optical input, optical input devices can be connected to any other optical fiber output, such as televisions, set-top boxes, projectors, DVD player, CD player, sound cards and other digital computer.

More details, please find HIFI Wireless Bluetooth 4.0 Decoder with CSR8670 and AK4490

A tube headphone amplifier with the most completed functions

A tube headphone amplifier with the most completed functions


May it be a tube headphone with the most completed functions? The anwser is yes, it is one of the most completed ES9018S advanced decoder in the industry currently, which can be used as HIFI headphone amplifier or preamplifier. Built-in XMOS (U8) + ES9018S + Bluetooth CSR BC8670, all functions are currently the best configuration. With the highest level decoding solution at one time, it built in USB digital interface XMOS (U8) program to support DSD hardware decoding, also it adopted HIFI tube-transistor hybrid differential amplifier circuit for headphone with strong driving force and Bluetooth CSR BC8670 programs to support high-quality lossless transmission APTX (I2S input receiving a digital signal after ESS9018 decoding preamp output), at the same time it supports OTG input function from the smartphone. Used a unique Patent tube-transistor hybrid differential technology as discrete components core made, it achieve high-quality pre-amplifier output also.


The sound features of the preamplifier and headphone output is warm, delicate, transparent, fast, wide sound field and very dense. If your amplifier is insufficient driving force or its sound is chilled, you can use it to drive your headphones and earbuds or use it as a preamplifier; its sound quality will have significant improvement that can fully make your equipment sound achieve another higher level. Its unique patented technology for the core tube-transistor differential amplifier with full hybrid discrete components and parts designing, includes tube differential amplifier, preamplifier, driving amplification, power amplification and feedback tube recycling, combines the properties of transistors and tubes, so that it gets more delicate and gorgeous sound, and get transistor sound effect with rich transient, thickness, density of the sound quality, and higher driving force, which cannot achieve the sound quality and height if only depend on tube or transistor circuit designing.

There are main features as below.
1. DAC adopt chip ES9018S, which has 32BIT HyperstreamTM DAC patented structure, and time-domain jitter removal, as well as having a 135dB dynamic range and distortion of -120dB, it is highest level of performance in the industry today. This equipment has been full play the strength of this chip, with its high performance, enough to satisfy the most demanding audiophiles.
2. With Coaxial audio signal can input straight into ES9018S for decoding, it support for external high-quality digital audio.
3. Adopted USB digital interface XMOS (U8) with the highest level of 32BIT / 384KHZ ES9018S DAC decoder IC designing in the industry, it supports DSD hardware decoding solution. The benefits of built-in USB digital interface XMOS U8 and DAC decoding integrated, it obtain the best sound quality based on the shortest distance transport.
4. With the highest levels of audio-specific CSR8670 Bluetooth chip, its support Bluetooth playing. CSR8670 is a high-quality Bluetooth 4.0 chip that supports digital output in the industry, the signal straight output into ES9018S decoding, and support for APTX lossless transmission, powerful and excellent sound quality.
5. Input selections with CD / AUX / Bluetooth / USB (OTG mobile phone support input) / COAXIAL audio.
6. Output options: Headphone output or volume controlled preamp output (balanced and unbalanced, RCA output).

7. Fully discrete power amplifier configuration designed for high-fidelity headphone amplifier, strong driving force. And on the back panel, there is Gain switch, headphone range from 8 to 1000Ω impedance adaptation completely when adjustment.

More detail, please visit http://www.aliexpress.com/store/product/Tube-Headphone-Amplifier-Preamplifier-DAC-12AT7-Bluetooth-4-0-CSR8670-XMOS-ES9018-Decoder-DSD-Balanced-Output/725205_32672977168.html

Why Western Electric cable is so good?

Why Western Electric cable is so good? 

Why Western Electric cable is so good? Because it has a very distinctive features, it is a relatively high frequency soft, delicate but not very bright, transparent midrange, thick but not fat, but also low frequency is more flexible but not a hard, and it is widely used to make HIFI speaker interconnection cable and power cord for tube amplifier, that make the amplifier have pretty good performance, such as high-frequency glitches was silky smooth, overall feeling is very soft.

Those cables that consistent used in sea, military, communication were made of pure copper wire, cotton knit, soft packed which lead to good insulation, so it can play a very good waterproof, fireproof effect. And also, this makes the cable be super soft, you may redeem at any angle, fairly broad applicability.

There are main features for the cable

1. The cable has a special physical structure, internal copper core soft, silver-plated copper core out of white metal, then a gray insulating layer to twine wrapped, pure tone and warm, thick, and is a good choice to produce HIFI speaker cable, power cord.
2. WE gray spots cable, the first outer is layer of cotton, a second layer is plastic, the third layer is 250 pcs 0.25mm outside diameter copper core with coated silver metal.
3. With transistor amplifier, it also has a very good performance, its sound performance is clear, calm, rounded lines, grainy lines outstanding performance, wide sound field depth, and the sound quality is concerned.

Now audiophiles use it to make HIFI power cord or interconnection speaker cables.

There is a HIFI power cord that is made of Western Electric cable and Oyaide 6N OFC gold-plated power plug & socket , it is good choiec for your tube anplifier.

More detail, please visit http://www.aliexpress.com/store/product/HIFI-Power-Cord-Japan-Original-Oyaide-6N-OFC-Power-Plug-Socket-Gold-plated-Western-Electric-Gray/1984109_32669092351.html