The most popular from what I've read about (although from subjective sources) seems to be the burson op amps. I am not sure which models would be compatible. I'll do some more research :)
Thanks for the info. This is a good start for possible candidates. Hopefully others can chime in too...
Great review, thanks! Amir, if possible please test op amp swaps! It'd be very interesting to know if it does anything in the audible range. Also, testing it wouldn't be a waste of time as they mention this option as a feature when buying this product.
That's what I'm curious about. Considering the majority of audio talk online being biased bs, I am skeptical whether it will make a subtle change at best, but willing to try. Want to find a nice A/B switcher to use with other solid state amps too to compare apples and oranges. Only decent...
Own the O2 from mayflower, 1x and 3.3x gain. Own a topping A30. Very nice amps, recommend highly. In the future I plan to swap a burson opamp into a topping A30 and use another A30 I have to do an A/B comparison of opamps and see if they make a noticeable difference. Can't comment on the...
Is it possible to dim the display, or turn it off while using d50? @amirm
Interesting. Thanks for the link. Do you have recommendations for the cables to attach to this, and an enclosure for it?
Pffft, everyone knows if you want organic sound you have to use limestone. Its made from ancient sea creatures, that once had a full spectrum of marine sonar waves traveling through their shells that affects not only the tonal qualities, but the plankton of your source.
I'd vote for any or all of these products:
Topping A30 headphone amp
JDS Ol switcher passive preamp
JDS labs Subjective3, 3 band equalizer (very new, very interesting)
magni 3
O2 amp (have one with 1x/3.3x gain, pm me if you need it for review)
Aune X1s 10th anniversary dac/amp
Arcam rHead amp...
For testing a recently made r2r dac, I would suggest the combo dac/headphone amp r2r-11 from audio-gd as it would be about $450 usd tops, shipping included. Its also their cheapest r2r dac from what I can tell. Also, their nfb-11 has pretty much the same hype train...