Quote: Yes you can.

Quote: Hi, don't think you will be disapointed. As far as I understand, the two dual filter opamps closest to the DAC affect both the head output and the RCA outputs, while the single buffer opamp after the filter opamps only affect the RCA output. That is, you can remove the buffer opamp...

Thank you razzz42 for your report on the LME49990.. Because of it I had to buy those chips (on adapters from China), and now I understand why you like them so much. I fully agree, the LME sound even better than the very good in my opinion THS4032. So now I am about to be lost in Nirvana...

Tried the HD2 without bufferamp and got the best computer sound I have ever heard. Leaving the buffer opamp socket empty gave much better sound than with the LT1028 or any other opamp at that position I have tried. I then compared THS4032 and AD797 on the filter positions and the clear winner in...

The 27pF ceramic disk caps I soldered on the AD797s proved to be a bad idea. Taking them off made an improvement. I now hear sweeter and more natural sound with the AD797 than with the THS4032 on the filter positions, so I'm back with the combo suggested in this thread, 1x2xLT1028 + 2x2xAD797...

After adding the CLC-filter between the P24 +12V and -12V I realize that before I did that I listened and judged not only the SQ potential of the opamps but their capacity to suppress garbage on the rails. With insufficiently filtered rails, LT1028CN8 (on the buffer position) came out as the...

Very nice! Beautiful capacitor mod. I tried myself once to upgrade the capacitors but ended up in a ruined card due to using a too high wattage soldering-iron, so well done! I see AD8066 as filter amps, but which amp is the nice can? How does your HD2 sound after the mod?.    

And one more thing. Forget about film caps between the rails (I know...I changed my opinion again). Solder electrolytic caps instead between the +V and -V rails on the opamp adapters. I use Elna Silmic II 100uF/25V. They do a great job cleaning up the sound in my system. Bass becomes more firm...

After some more listening I turned back to the LT1028CN8 as buffer stage. It has more body in instruments and they are more natural sounding. The AD797 is also very detailed and good sounding at first but it became obvious to me at comparing with the LT1028 that it has a slight artificial edge...

I would definitely try AD8066. How it sounds on your circuit I have no idea, but it is superb as output buffer on Prodigy HD2 (togeher with 2xLT1358 as filter amps). See my post  http://www.head-fi.org/t/322497/audiotrak-prodigy-hd2-opamp-configurations-list/435#post_8626006

This thread appears dead but for guidance I think I might anyway convey my experience and changed opinion on best opamp combo for the Prodigy HD2. After having built a high-end cics Memory Player computer with SSD, passive cooling and pi-filters on all voltages I have come to the conclusion that...

Hi, Very interesting thread. I tried the suggested combo 1x2x LT1028 + 2x2x AD797 and found it good sounding, better than the quite nice sounding combo 1xAD8066+2xLT1358 prior on my HD2 card. Only it is somewhat veiled in upper midrange and treble and not as transparent as a new combo I...