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Soekris discrete R2R DAC?


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Anyone already bought this one and/or seriously considering it? Seriously tempted to try one against my M-Dac with the added bonus that it could drive my T1s directly :)

 

dam1021_top.jpg

 

More info: 

 

http://soekris.com/products/audio-products/dam1021.html

 

https://hifiduino.wordpress.com/2015/01/30/building-soekris-r-2r-dac/

 

and a couple of gargantuan diyaudio-threads  ;D

 

 

//UFN

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Finished building the first one of the DAM1021. This is the .05% resistor version. Runs on +/- 9VDC rails. Amanero USB/i2s receiver. It's hard to beat for the money.  

2nd DAM1021 build close to being complete, waiting for a 1-foot USB cable. This one is with the DAM1021-12 board, the one the uses .01% and .02% resistors which can be visually identified by the

It lives. Sounds very nice. The Amanero interface causes drop-outs and nasty plops on Fs change, which isn't very nice. The word is that a certain Chinese USB->I2S interface by one Diyinhk doesn't

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It looks like an interesting DAC (output taken directly off the R2R for single ended), I've been following it for a while. There is an issue with the current firmware (this should be updated according to Soren)- there is DC surge when switching sampling rates and two people have fried their speaker drivers. So be sure to manually mute before you do that.

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These plops occur at Fs change when using certain USB/I2S interfaces and aren't harmful to your speakers. One guy fried his speakers by directly connecting the DAC to a 400W amp. All in all a reasonable thing to do, only if the DAC doen't lose it's connection to the potentiometer. Which it did (prototype setup, less than optimal soldering...) and gave the speakers a taste of that class D glory.

 

As for the other guy - he somehow damaged the SMPSU. Sure, there are still kinks to iron out, but it is to be expected. Fortunately the DAC has a serial port which can be used to reprogram its firmware.

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It lives. Sounds very nice. The Amanero interface causes drop-outs and nasty plops on Fs change, which isn't very nice. The word is that a certain Chinese USB->I2S interface by one Diyinhk doesn't behave that way.

 

9FficSV.jpg

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Got mine running yesterday with xmos usb-i2s, sslv +/- 12 PSU and stock firmware (still waiting for my usb-serial to arrive).

My first impression is this DAC has really clear sound, decent treble and mid. Yet the soundstage isn't very deep and the bass is not adequate. 

My comparison is based on the same amp and headphone and comparing r2r to my forssell mdac-2

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An acquaintance of mine did a series of tests and measurements on his DAC and it turned out that current filters are less than optimal. To get the best sound try feeding in as high resolution signal as you can.

 

I'm waiting for a new set of filters to come out.

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  • 2 weeks later...

Just swapped out the digital filter on my DAC. I consider it to be a must! So far the best one for me was MB1 by TNT on DIYA.

What kind USB RS232 did you use?

Mine from adafruit doesnt seem to get the job done right.

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I bought a trendnet USB-RS232 from amazon, it works well with soekris's R2R.

With new firmware and NOS filter, Ive be able to do all the conversion and upsampling with my HQplayer.

The bass is back although still not quite perfect.

Also running in NOS reflects filter changes in HQplayer very well.

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I wonder how it would do with a balanced tube output stage. Circuit ideas anyone?

 

The "Broskie cathode follower" lends its self well to balanced drive.

Build 2, and hook them up out of phase.

 

broskie%20cathode%20follower.png

 

You could also build a simple long-tail-pair output stage with a robust small-signal tube (5687, 6h30, etc) and transformer couple to the output. If you want to get fancy (and why not?) use a blumlein garter instead of a LTP. 

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  • 4 weeks later...
  • 2 months later...

Soekris R2R connected to the Raspberry Pi2 (RPI2)

 

post-4645-0-34127300-1432788574_thumb.jp

Soekris integrated in to existing Logitech Media Server setup with 2 existing RPI2s and 2 squeezeboxes.

 

Ipost-4645-0-29031600-1432788773_thumb.jp

 

In the background is the LMS playlist manager, in the foreground is the player control app.

 

 

 

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