Custom Made In The U.S.A. Hand Assembled Professional Ear Gear



Ross Martin’s Audio Designs are based on TI’s line of “Sound Plus” TM and their Super High End Burr Brown PCM1794 DAC and PCM4222 ADC. Affordable High End Audio for the Home or Pro Studio.  All of our units are STEREO or Multi Channel.

The PCM1794 Ultimate DAC is a must have converter for every studio and HI-FI enthusiast.  Our DAC and ADC are now used by SONY/McHenry Records

Super Low Noise 129Db  Low Jitter with TI’s NEW DIX9211 Receiver. Low Distortion

THD+N: 0.0004% with adjustable balanced outputs.

Optical and SPDIF inputs( RCA or BNC).  Studio Quality Reference  Mastering DAC

National LME 49710 and LME49720 Op Amps.  Hand assembled and tested in the USA.  Not a kit!  48 Hour Burn in.  Or custom configuration.

Internally Regulated DC Supply Voltages Of +3.3, +5,+15 and –15.

10ppm Crystal For The DIX9211

Direct coupled outputs all the way from the DAC to the Balanced Output Stage.  No hype about audiophile Caps.  Turns even the worst soundcard into a piece of HI END audio equipment.  As long as the card has a digital or optical output.  Upgrade your CD player, TV or anything else with a digital output.  Want A special config on the output jacks?  Just Ask.  Want a BNC on the SPDIF input.  Just Ask…….

Nothing to Adjust.  Just Plug it in and forget it!

Contact us for other op amp combinations!!

Snail Mail

3507 Lynnwood Dr.

Bellevue, NE 68123


We are a super small company it may take some time but we will get back with you.

Our Heavy Duty Boxes are made of 16 Gauge Aluminum with REAL HARDROCK MAPLE LIGHT OR  DARK END PIECES.



PCM1794A STEREO DAC  LME49710 LME49720

Price: $197.95

PCM1794A DAC Sale Price $197.95

 LME49710 49720

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SONY RECORDING SAYS“great dac this thing here is awsome!!!! better than apogee !! try it

PCM4222 ADC Analog To Digital Converter.  32, 44.1,48, 88.2, 96, and 192 Sample Rates  Bit Depth 24,20,18,16 Word Clock Out Master Clock Out/In  Selectable Filter Response Led VU Meters With Overflow Indicators.  LME49724 op amps  AES, SPDIF COAX and Optical Outs.  +4Db +-18Dbfs  Balanced XLR and 1/4” TRS Inputs   Price $362.95

We use all 50ppm 1% metal film resistors.

Cornell Dubilier or Vishay  .1uf bypass caps

105 and 80 Degree Cent Electrolytic General purpose bypass

Nichicon %5 film caps in the 2nd order filter.

We buy all our parts from Digikey, Dipmicro, Futurlec and Mouser.

We don’t use cheap parts like some amateur modders have posted on the net.  Changing general purpose bypass caps has NO EFFECT on the output circuit which is D.C. coupled and the cut off frequency of the 2nd order filter is above 162KHz

The original TI circuit for the pcm1794a used the lowly ne5534 and we will build the boards with i.c. sockets for the experimenter.   Why go to all of the trouble to make a great circuit board around these expensive parts and stuff it full of cheap parts?

Sony Records did their own blind listening test at Capitol Records in L.A. California with a few more than an audience of three and our single board unit beat everything else hands down. 

Single DAC vs. Dual DAC.

A single DAC is wired in a stereo configuration.

A Dual DAC uses one DAC for the Left Channel and one DAC for the Right Channel.  Giving the Highest SNR Possible.

We need your order to stay in business and grow.  Thanks!  No sales are what make us slow.