Thanks for replying to my old questions. Have been using ada4627 and opa827 in the active crossover...havent done any rolling since then..... Not sure I could hear much difference. There was a difference when I swapped the opa2124 with lm4562 though..

There is this ultimate opamp shootout thread on dya and I couldnt tell the difference say between 741 and some other newer opamps @@"

Sorry Kingwa I had mixed it up and misrepresented your i2s cable connection suggestion. Thanks for correcting it.

Yes, Kingwa said using flat ribbon is better, and to try different types for comparison. Make it short though.....

But defintely good finding! Thanks for sharing!

I see, from the close up, those are resistors next to the socket along the i2S PCB traces....the real buffer chip is way far back....but don't know of any implication....and together with the interconnect on Hi Rez programs, just a thought : )

Should take it back, there is no PC involved, so the USB isolation is another issue, still the long i2s lines on the PCB design does bother me....

Btw, kschiu, did u have any success on the exa interface (assumed) to ref 7?

Have been watching that qls QA660 too....very tempted to place a pre order earlier, but there was no review...and some how Clark said he preferred the spdif out to the QA100 FDA digital amp over the i2s connection...a bit of a strange comment.maybe the usb has no galvanic isolation while the...

Hi Doobooloo,   Wondered if you had done these comparisons:   1) SBT UBS > D2 DSP > spdif > Ref 1 2) SBT UBS > D2 DSP > i2s > Ref 1 3) SBT UBS > Ref 1   Could you share that with us?   Many thanks!

Quote: Thanks!! Pardon me, but why tantalum? I thought the material has a strong signature of its own, no? I suppose this is a good combination that you have tried : )

My 4627 gets quite hot...must be oscillation.... What would be good bypass caps for them? And how? I lost track on this.... I have two on an adaptor, up and down,,,,do I need to by pass both chips? Thanks guys!

Speaking of oscillation, I recently installed some ADA4627-1s and opa827s in my circuit (+_15V), and noticed that the ADA chips got much hotter than the opa ones, though I understand the ADAs draw 2 mA more each, but, would it feel much hotter for a 210mW dissipation than a 150mW? actually it...

Spent some more time on the DI listening test over the weekend.   Further observation through my ears on the Sony DVD player (DVP-PR50P) vs. modded SB3 vs. DI (USB powered), as they were connected to the Ref 2 DAC and to my Linkwitz Pluto:   DI was good, close to if not at the same level...

Quote: Bingo~!! Thanks so much Nada : )