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  1. qusp

    Stax Interview and Factory tour 12/12/12

    what do you call low and at what VDS? quite a few of the parts I mentioned were SiC Jfets and bipolars, but I agree its an area with the mosfets certainly that is a big problem. another thing was the fact that a Semisouth Engineer is working to understand what parameters are important to audio...
  2. qusp

    Audioengine A5+ Speaker Upgrades

    I speak mainly of the ceramics, there is more to specs than voltage and capacity. replacing them how you described will make the circuit performance worse. even replacing with the same type and increasing the capacitance may be worse by setting up resonances. as HF decoupling/bypass caps, the...
  3. qusp

    Audioengine A5+ Speaker Upgrades

    Handy Ray, I was commenting on the photos posted recently, since they were posted several times and people were talking about following recommendations and buying bunches of Elnas, I made the fairly reasonable deduction people would be replacing the 'crappy ceramics and SMD polymers' as is the...
  4. qusp

    Balanced B22 and buffalo dac build

    yep same thing as what i'm talking about, just done internaly, as you can see above i'd already looked that up in your manual to check it was possible and edited. I use ackodac these days for the main rig and have buff32 and buff II, but jumped ship before BIII and had to make sure it was doable...
  5. qusp

    Balanced B22 and buffalo dac build

    you can test by just shorting across the line of SData1-SData8 inputs to test before working out how to do that the neatest
  6. qusp

    Balanced B22 and buffalo dac build

    ahh sorry I thought they had made it so its able to be routed to all the dacs with the BIII in stereo mode, it depends on the dac implementation. PCM is louder or at least equal if the i2s is routed to all of the dacs. it depends on the source too, I havent tested Amanero in this way to see if...
  7. qusp

    Balanced B22 and buffalo dac build

    nice work! PCM is also somewhat louder sometimes than spdif with ESS so make sure to level match for comparisons. the Amanero board is a nice little unit, great for the money :cool:
  8. qusp

    The Opamp thread

    myself I stick to low inductance ceramic or thin film SMD, perhaps SMD PPS film. completely agreed, high class opamps are already running output stages in Class A or high bias AB for most loads. besides a CCS would be preferred for bias in a case/device that responds to it. indiscriminately...
  9. qusp

    The FiiO X3 Thread UPDATE: Project Back On! Read the First Post for Information.

    yep, device first, accessories later :cool:
  10. qusp

    The FiiO X3 Thread UPDATE: Project Back On! Read the First Post for Information.

    haha sorry... too dry? :D yeah I got it. indeed 3D printers and CNC are the future for niche hobbiests like us, even for short run PCB fabrication. Add in the spread of more accessible CLPD and FPGA programming tools and we can make our own hardwired firmware and dacs. actually seeing it on...
  11. qusp

    The FiiO X3 Thread UPDATE: Project Back On! Read the First Post for Information.

    oh yeah, oh well another brilliant idea down the drain, killed by a minor detail. I expected the hardcase would not be viable, at this price level and in smallish numbers it would likely increase the cost of the unit by 25% or more. I like silicone cases myself, stops them slipping out and...
  12. qusp

    The FiiO X3 Thread UPDATE: Project Back On! Read the First Post for Information.

    HolyCheese, asking for opinions on the comparative subjective SQ between the cowon and a device that isnt finished yet and nobody has heard, is not the best way to get meaningful information.
  13. qusp

    Listening to line-out

    well thats odd, because particularly with multidriver IEMs, using a constantly varying output impedance driven by a low current dac output is a terrible idea technically, perhaps you like the erroneous frequency response you are getting?
  14. qusp

    The FiiO X3 Thread UPDATE: Project Back On! Read the First Post for Information.

    but then you need a soft case to protect the hardcase from scratches....
  15. qusp

    Pictures of Your Portable Rig (part XVI)

    probably something in the clocking or spdif output circuitry of AK100, jitter will be higher in the peculiar UAC1 version of iphone USB->i2s->spdif conversion also (notice the extra conversion too), even if onboard clock is the same. I prefer well done USB2.0-i2s to spdif in home hi-fi, but...
  16. qusp

    Pictures of Your Portable Rig (part XVI)

    do you really mean transport? doesnt seem like you do, or you have made the mistake of thinking the Dac analogue specs listed apply to the digital out? there is no digital crosstalk, the crosstalk has no effect on digital output. I doubt you will find the AK100 still has lowest crosstalk for low...
  17. qusp

    The FiiO X3 Thread UPDATE: Project Back On! Read the First Post for Information.

    black shows dust, white shows grime, I know which I prefer....
  18. qusp

    iPad Mini - anyone ?

    hmm, you read the thread?
  19. qusp

    The Opamp thread

    haha, I think its more likely the way you (or whatever ebay dac it was) used it sounded rubbish, to say the Jung diamond buffer itself (the discrete circuit both BUF634 and LME49600/10 are based on) sounds rubbish, is quite frankly.... rubbish. opa627 is unity gain stable, but again current...
  20. qusp

    The Opamp thread

    yes, as ive covered here a number of times, its really not what I would call unity gain stable. they are stretching the truth in the datasheet, it needs a very well laid out and well executed PCB to make this work properly, its very prone to oscillation otherwise and not exactly happy driving...
  21. qusp

    Review: iHiFi 812 v2 portable player - an interesting "budget high-end" portable

    the 960 seems far too big and clunky to buy to use the digital out and the compulsive ASRC is a turn off for that application as well. you would hope for some significant other upgrades over the 812 for that much extra dollars, the pins and most parts for the digital out are already there so...
  22. qusp

    Melbourne Headphone Repair?

    Hey! I resemble that remark! :p
  23. qusp

    The Centrance HiFi M8 thread

    I agree completely about the RSA jack and i've been pretty vocal about it, its magnetic, its tin, its plastic, it has little by way of strain relief and it puts stress on the cable, i'm disappointed it has gained traction, only TRRS is worse... mini 4 pin XLR, Hirose (not the same as lemo) and...
  24. qusp

    The Opamp thread

    there are many reasons to go balanced, its not a magic bullet, but its not a myth. using the LCD2 and a fairly average balanced dac circuit isnt the best conditions, LCD2 are a piss easy load, one of the easiest headphones to drive of any type, so your main improvement will be from the dac, so...
  25. qusp

    Leaving portable hifi - it's too silly

    realizing why the O2 and ODAC are cheap only takes a few minutes of thought. hint, because their development, design, prototyping, testing and support are not part of the cost because they were given away for free (well I expect the bigger resellers are bearing some of this support, particularly...
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