Flagship Headphone Amplifier HIFI Full DC Amp Class A KSA5 Circuit Power Amplifier 8W Output Discrete Component

This headphone amplifier is much layered and extensions, that can realism distinctly and fresh feeling for every note, details, and layer. Its THD + N (THD + Noise) only is 0.00607% @ 1KHz & 300ohm load

Its design is based on KRELL headphone amplifier ksa5 circuit, which should be the most powerful amp circuit for driving force currently. With a gold seal input FET, and output stage used two pairs of ON transistors king NJW15034.15032 (or 15,032.33) with 8A output current per channel, that guaranteed enough low output resistance. Effectively to drive transistor used four small power one in parallel, its benefits are more detailed and better overtone. You can drive those flagship headphones like as HD800 HD650 Q701, and so on. And as a Class A amplifier to use, it has a strong driving force, there are four speaker terminals installed on the back panel, enough to push desktop speakers.

The whole material used are extremely well, everything prepared for the flagship headphones!

How to handle unbalance for left and right channel of your HIFI audio system

How to handle unbalance for left and right channel for your HIFI audio system

Someone had asked our technician what he could do when the audio system happened unbalance for left and right channel.We summarized it the tips as below and hope it help you to solve the problem.

Before checking and adjustment, Please make sure the tubes had been put right position and get well contact between pins of tube and tube bases all.

1. Firstly, please check if the left and right are unbalanced when volume potentiometer is rotated to any positions.

1). only if the time around the beginning of the volume potentiometer, imbalance problem should be caused by the volume potentiometer.

2). If at any position, it is imbalance, it should be other questions.

2. Sitting down / standing up in the middle position of your listening area, does not move (the previous position does not move), so let your families quickly replaced the left and right speaker cables from the outputs of the amplifier to change, the cable ends of speaker do not move temporarily

1). If the same thing happened still, it should be the speaker and cable led to the problem. Then, please exchange the speakers and don’t move cables, if there is an offset for volume, it should be caused by the speaker, and it is probably caused by tremble speaker. If there is no offset, please check the cables.

2). If you replace the speaker cables and it happened, it should be caused by audio amplifier or signal sourcing.

3. At this time, please exchange your RCA signal cable (up and down to exchange)

1). If there is a shift, then it should be the signal source. Please check your audio signal sourcing.

2). If not a shift, then it should be caused by amplifier or signal cable, then please check the amplifier. For tube amp, please exchange the tubes to find out the problem.

4. There is a possible problem is the speaker placement, please try it.

IWISTAO Portable Stereo Bluetooth Speaker

IWISTAO Portable Stereo Bluetooth Speaker

This Bluetooth Speaker build in 2 pcs 3W 2 inch full range speaker units and a passive diaphragm to enhance bass, also build a rechargeable lithium battery.

It is a portable Bluetooth speaker and very popular at that days.

Tape also HIFI

Tape also HIFI 

Tape is also HIFI, enjoy it!

Future road for Bluetooth 4.0 technology combined with NFC

 

There are Bluetooth, NFC, and WIFI for short-range communications technology, and they have their own advantages and disadvantages, but also they could be a leading position in their own expertise areas. However, they are not mutually exclusive, but they could be a complement each other, and it become better solutions or products by mixing together, such as Bluetooth speaker with WIFI plus Bluetooth, or Bluetooth devices with Bluetooth 4.0 plus NFC, it may be develop more convenient and excellent product for user experiencing like as NFC & Bluetooth speakers. So these integrated technologies can also be applied to other fields. With forces of smart mobile terminal widening, it is lifted wireless-related technologies and NFC (Near Field Communication technology) is prevalence. Possibly some people thought, Bluetooth technology which has accompanied the mobile terminal for years somewhat seems eclipsed, it perhaps every dog has its day. However, the biggest advantages of Bluetooth technology still is low power consumption, stable, low-cost, high security, as well as Bluetooth technology has developed a broader category of products in the past years. The market is expecting that sales of Bluetooth products will exceed 32 billion in next five years, as well as a large-scale ecosystems of Bluetooth is expected to get quite fruitful.

Currently, Bluetooth technology has developed to 4.0 version, and compared with the previous version, substantial improvement is transmission of technical specifications, which is better than Bluetooth 2.1 + EDR and 3.0 + high-speed, in particular it solved a problem of large power consumption when devices apply for high-speed transmission applications via Bluetooth, devices can be switched working modes according to different work situations in the new version of the Bluetooth specification. In the Security section, Bluetooth 4.0 version applies a 128-bit AES encryption, and is very suitable for those areas requiring high security using.

As for low power consumption, Bluetooth 4.0 technology has a very low operating and standby power consumption, if using a button battery, Bluetooth 4.0 device can work continuously for several years. If it is able to match energy acquisition-related technology like as solar at that time, I believe it is free to use battery, make mobile devices be more light and thin for product volume. In addition, Bluetooth technology has been widely used in daily life, Bluetooth device is gradually increasing, also it can remove limit of pairing number through Bluetooth 4.0 technology.

It is often criticized by consumers that pairing verification is too complicated in the past, but now this problem has been fundamentally resolved. Bluetooth SIG said that they spotted NFC business opportunities, and has combined Bluetooth 4.0 and NFC technology to provide safe and easy online pairing, so that consumers will pair online those devices which have two functions both when pairing just gently touched, it will be able to start online validation and automatically complete the pairing.

Mostly common devices equipped Bluetooth technology are Bluetooth speakers, Bluetooth headset, and Bluetooth stereo or other AV products. However, with evolution of Bluetooth technology continuously,  it has begun to reach out to individual health and sports products, in the other hand , sensor devices equipped into mobile devices, it will fully meet consumer requirements of health care, sports and fitness, security, entertainment and home automation for Bluetooth Smart sensor applications in the future, as well as a varieties of Bluetooth products open more channels in networking applications, I believe that Bluetooth will occupy a place for development of the Internet of Things in the future also.

There is a Bluetooth 4.0 speaker with NFC as below.

http://www.aliexpress.com/store/product/Free-Shipping-Bluetooth4-0-NFC-Stereo-Speaker-CSR4-0-Instantly-Pairing-Connection-with-NFC-enabled-Smart/725205_1457314484.html