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Posts by alphaman

Perhaps because ....they are in diff. price categories and those who can only afford UD110 can't shell out for Dragonfly, Meridian, etc.Perhaps because ....those who can afford (and buy) the more $$ stuff don't believe a budget device can sound decent.Perhaps because ....reviewers that do receive review samples won't speak too much (or too loudly) when a budget overachiever from some unrecognized upstart enters the product category. I.e., POLITICS. Perhaps because ....the...
Good point, but it's worth it. I like the AD8397 opamp (+ LPF). Also, the ESS9023 was ESS's lower-end DAC, w/o ASRC -- their higher-end DACs are better. So, $10-15 cost increase is next to nothing -- esp. as when as an alt. and not as a replacement model -- and the increase in SQ should be significant. I, DIY breadboarded something similar a while ago with very good results.
Just found this thread...Nice write-up and updates ClieOS! This is an important topic and an important product category: low-cost, high-performance, thumb-drive DACs.  It's great there are real-world (=high-performance) alternatives to high-priced models such as Meridian, DragonFly, etc. Curious as to why Stoner switched to the TI (PCM) DAC in favor of the high-rated ESS. ESS has newer 32-bit models out now for portable use, so perhaps a future model by Stoner can...
Very interested in these. Tyll at IF say they measure VERY well. An Amazon reviewer noted these are 2nd only after 1964 Quad.  The Onkyo web site has good, succinct details.  Wow: 14.3mm dynamic driver ... and Onkyo stresses their design effort went into bass QUALITY, not QUANTITY. Hope y'all buy a ton and provide feedback ... and then us hold-outs can reap the bennies ... on YOUR tab, of course ;)
Migoul67 ... we've repeatedly read your comments about how much you like the TekMOD ... and your sig lists several source components that may be used in compare/contrast tests with T51. This would be useful ... even if source components are not exactly in same "category". E.g., TeKMOD vs. iBasso D7, etc. BTW: Your equipment (if sig line is correct) is hardly "poor" ... both in dollar value or audio quality.   
Without detailed schematics or better (more updated details or photos) you're all talk.  I've tried various tweaks with the T51 and CK4 on a breadboard, bench and with o'scope.My advice to those looking to bring the T51 to very high quality is simply replace the stock LPF opamp with an AD8066 or AD8397. That's mostly all one really needs to significantly improve over stock. And it's something most people with basic soldering skills can easily handle. 
As long as there is plenty of current, the TPA6120 works fine with one volt below its spec'd minimum (this is where actually testing the device -- measuring distortion, etc -- instead of just going off the datasheet pays off.) About your comment "I am not going to publish all details about the modification, it isn't necessary for me." It would be to your benefit to do so, as other DIYers from player.ru already have -- as I noted earlier, you seem to have only repeated...
The THS4222 may have "excellent data" (PUBLISHED specs) but  ...(a) those are specs done by the manuf. (or did you personally bench spec them, burnwaygta?); and (B), in any case, good specs do not always equal better sound. A good example of this is vacuum tubes vs. solid state.I have compared the THS4222 to the TPA6120 and much prefer the latter. I design by ear and  manuf. specs and my own oscilloscope measurements. The manuf. datasheets of opamps publish full and...
Not saying you will ever encounter the worst-case scenario but in the case of DC, it's not what you HEAR that will kill your IEMs ;)Is this what you're using for the TekMOD HO and/or LO opamps?Why not use purpose-built headphone amp ... also from TI? E.g., TPA6133A2. I think your customers would like this, but you'll have to solder at SOP level. Or you may also try a class-D amp for experiment.
That's a lot of effort ... and now, the TekMOD produces even greater transients?!! Well, we all NOW know what the risks are ... so those that may be affected have been properly warned ;)
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