[earfonia]

Anyone knows what is the gain setting for the headphone out op-amp (stock OPA2604) ???
 
I plan to try AD8066 to replace OPA2604, but AD8066 stables on gain 5 and above.  Thanks!

 

[earfonia]

Quote:

Anyone knows what is the gain setting for the headphone out op-amp (stock OPA2604) ???
 
I plan to try AD8066 to replace OPA2604, but AD8066 stables on gain 5 and above.  Thanks!

I got the answer, the low gain setting for headphone output 1 is 2.5, and the high gain setting for headphone output 2 is 10.
My mistake, AD8066 seems to be unity gain stable. The datasheet doesn't state it, also not stated what is the minimum stable gain, but the graphs showing gain of +1, +2, etc, so it seems that AD8066 can be use for Dr. DAC2 DX.  I will test it when have time.

 

[fishyee]

This amp is a little gem.  If you own one and haven't swapped out the op-amps yet, you must give it a try.  Depending on your cans, you can tailor the sound perfectly to your liking.  A OPA627 browndog in the headphone output did it for me.  It impacted the sound more than swapping out the op-amps in the dac section.
 
I also like the sample rate indicator lights ... tells me if my computer is sending out a true bit rate.

 

[earfonia]

I finally settled with 3x OPA2107 to replace the 3x NE5532 in the FDO section, and OPA1642 for the headphone amp section.  I tried also AD8066, not stable, generates noise after a while.  OP275 sounds very close with OPA1642, not easy to distinguish them, but OPA1642 has a tad better detail and separation.
 
Yes, Dr. DAC2 DX is very nice DAC+Amp unit, small and wonderful

 

[maybeyes]

nice thread, I m interrested what phones you guys are using and with what music? I m completing a travel rig I got the dr dac2 on stock opamps now and I m lost when it comes to picking a pair of phones.
 
The Dac is great with my speaker system, not much else to say, just perfect for me. Then I got myself a pair of sr80i's and I m not happy at all with that setup. No bass, some frequencies are saturated and some drum kicks sound almost like a clipping mp3 and are downright painfull, zero soundstage - all is flat. Few albums sound good though, things with lot of keyboards and no deeper bass. Also gibson SG's, Les paul's and Fender Telecaster are playing good.

 

[garfieldso]

Let replace the 2 wima 2.2.uf cap with some better one, the sound stage will be completely different!
I found the poor sound is come from the 2 wima 2.2uf caps, and it is the bottle neck of the Dr.dac2 dx.
I replaced them with 2 M-Cap 2.2uf 250V.
It will be impressive rather than replacing the op amps........

take a reference to
http://www.earzone.com.tw/viewtopic.php?f=8&t=2887

 

[Ultrainferno]

Nathan published his Dac3 review earlier
 
http://www.headfonia.com/audiotrak-dr-dac3-a-kludgy-steal/
 
Can't seem to find a Headfi thread on it

 

[RedTwilight]

  Nathan published his Dac3 review earlier
 
http://www.headfonia.com/audiotrak-dr-dac3-a-kludgy-steal/
 
Can't seem to find a Headfi thread on it

 Well having no Headfi thread is kludgy, but it works.