FAQ

Q: Do you making the best DAC in the world?
A: No. We are not going to do the best DAC in the world, because it will be very expansive and it's development payback period will be very long or even endless.
    Instead of this, we are tying to do the best DACs with the reasonable and balanced price, and we have high performance, mid level and economy solutions.


Q: How I can use you multi channel USB interface and D/A convertors?
A: There are 3 different applications:
  • multi channel audio (home cinema), 5.1, 7.1 and 9.1
  • multi band amplification for stereo audio - you can use digital crossover (DePhonica, JRiver, etc.) for frequency band splitting, then X amplifiers and X speakers. Up to 10 channels (up to 16 with ATDAC-92).
  • multi channel audio with multi band amplification. This requires more then 10 channels, let say 12-16-24.  We do not sell the separate USB interface for this application, but we have ATDAC-92 with optionally up to 16 channels.
Q: Why you do not recommend to use digital volume control? Modern DACs are 32 bit, most of the audio tracks are 16 or 24 bit.
A:  This is a very common mistake, when the data register  width is considered as the real DAC resolution - there is no connection at all!

There are 2 usually used methods to define the real DAC resolution - SNR and ENOB.
I prefer the second method,  ENOB (Equivalent Number Of Bits), calculated from the SINAD (Signal-to-Noise And Distortion). 
SINAD is calculated from SNR (Signal-To-Noise Ratio)  and THD (Total Harmonic Distortion).
The first method uses SNR only. You should remember - ENOB < SNR < Data Register bits.

This is the comparison table of the most popular DAC chips:

 DAC     DATA Bit
 ENOB
 TDA1540     14 13
 TDA1541 16 15.5
 TDA1543 16 12
 PCM63P 20 14.9
 PCM63P-J 20 15.5
 PCM63P-K 20 16.2
 PCM1702 20
 15
 PCM1702K 20
 16.3
 PCM1794 24 17.6
 PCM2702 16
 15.3
 PCM5102A 32
 15.1
 ES9018 32
 19.6
 WM8741 24
 16.3
 CS4390 24
 15.8
 CS4398 24
 17.9
 AK4324 24 15.3
 AK4399 32 17.1
 AK4414 32 17.4
 AK4490 32 18.2
 AK4497 32 18.8
 AK4458 32
 17.4


Q:  What is the difference between ATDAC-8A and ATDAC-8AM?
A:  8AM is the same as 8A but with the separate headphones amplifier and analogue volume control (potentiometer).


Q:  What is the difference between ATDAC-10 and ATDAC-8 lines?
A:  ATDAC-8 line are low cost, USB input only D/A convertors.  The same is about ATDAC-91 vs ATDAC-9.


Q. What is the difference between ATDAC-10 and ATDAC-10S?
A. We make ATDAC-10 now  only in 10B version, with AK4490 chip.
    ATDAC-10S have 3 options - AK4490, AK4493 and AK4497.
    10S have additional analogue input, optional analogue volume control, InfraRed Remote Control and other features. See the description.


Q. Is there any sense in the numbering ?
A. Not always, many numbers  has been historically happened, but some sense  is:
  • 8xx -  Small USB DAC
  • 9xx -  Multichannel DAC
  • 10xx - High Performance Stereo DAC


Q:  All items, shown at your site are for sale?
A:  No. Some items are obsolete, and we keep this items at out site to show the history.  Not all, of course.
      Also we have some devices which are not shown at out site (usually the customized devices, etc.)


Q:  Do you accept the individual orders for developing custom device?
A:  Usually - no. We can make customization of our devices, if this is possible or if we see the market for this device (at least for 20-30 pcs). But, there are exceptions.


Q:  You making only audio devices?
A:  No, but the audio is our mainstream.


Q:  You have your own production line?
A:  Yes and No. PCB assembly for very small  quantity we are doing manually "in house", for higher quantity - we use  factory machine assembly.
Also the final device assembly and testing we are doing "in house".
But, of course we use subcontractors for some parts and operations (PCB manufacturing, some mechanical parts, higher quantity PCB assembly, etc.)



Q:  What is a lead time for orders?
A:  It depend of a stock. Items we have in stock are shipped within 2-3 working days.


Q: Do you provide combined shipment?
A: Yes. But the total weight should be considered.


Q: Do you provide the tracking number for shipment?
A: Yes, we do not send any parcel without the tracking number.


Q:  What are your shipment options?
A:  Currently: regular mail with the tracking number or EMS.


Q:  What are my payment options?
A:  Cash, check, PayPal for Israeli customers,  PayPal only for customers abroad.


Q:  Do you pay taxes?
A:  Yes, sure. We pay VAT, income tax and the social insurance.


Q:  Do your customers must pay VAT?
A: Only customers in Israel  must pay VAT. All prices at out site are before VAT.