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About gepardcv

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  1. gepardcv

    KGSSHV Carbon Build Thread

    My ODAC is a piece of garbage. It clips loudly, audibly, and obnoxiously when macOS system volume is set to >50%. Maybe it's broken. Not one other DAC I tried does this, at any price point. If you want an integrated DAC+amp solution for your Carbon, you're much better off with Soekris boards. Still not recommended: (1) Carbons run somewhat hot, and I don't know if it'll take much to fry the DAC boards, (2) you'll have a much more complicated internal layout, (3) you'll need a larger case, (4) you'll have a much more complicated power supply setup to deal with. General piece of advice in addition to what others have already said: get some experience drilling and tapping external heatsinks. I destroyed the first one I worked on.
  2. gepardcv

    The Headcase Stax thread

    Over 3k USD for a slow-ass f/5.6 lens? I’ve had good luck with Leica glass and enjoyed rangefinders in the past, but that’s just silly.
  3. gepardcv

    The Multi Amp aka Dynalo Mk2

    Wait, did anyone actually determine that the heatsinks don't help cool the transistors? That's... counterintuitive.
  4. gepardcv

    The Headcase Stax thread

    Resurrecting a year-old post about the iESL. I've been thinking about this. What exactly is the problem of putting a cap after the ballast resistor? Is it just that having a capacitor as the last thing on the bias line would cause inrush current to surge while the cap is discharged and fry the diaphragm? If so, wouldn't the resistance still be set by the ballast resistors (5M or whatever) and so therefore still limit the current? Assuming voltage remains a constant 580V.
  5. gepardcv

    2018 PCB Group Buy with TKD pots

    My stuff came in. Thank you Steve!
  6. gepardcv

    The Headcase Stax thread

    Monoprice posted a product page for a $700 electrostatic system: https://www.monoprice.com/product?p_id=33455. No description or specs, but the pictures look like that might be a Stax plug...
  7. gepardcv

    (closed) Dynalo Mini enclosure group buy

    Also paid. Thank you!
  8. gepardcv

    The making of a SuSy Dynahi

    I usually make my own BOMs following the board silkscreens. That way it'll definitely be up-to-date. The only non-obvious parts I remember are the LED, so use LTL-307ELC.
  9. gepardcv

    The Headcase Stax thread

    You mean when the drivers are made or when the speakers are assembled? I was startled when a rattle in a pair of DIY C-Note speakers I built went away after a few hours of pink noise. (And that rattle wasn't imaginary. I have the speakers set up to play with a digital piano and Ravenscroft 275. The woofers definitely made bad noise when I pressed certain keys but not others.) It would make sense if the drivers were not run when manufactured, and it would also make sense to run a speaker for a while after assembly to get rid of problems like the one I ran into.
  10. gepardcv

    The making of a SuSy Dynahi

    Have you already gone through the existing Dynahi thread? There will be some dead links, but using the search function will get you pretty far. https://www.head-case.org/forums/topic/9768-kg-balanced-dynahi-build-discussion-thread/?tab=comments#comment-468974
  11. gepardcv

    Massdrop copycat R2R DAC

    I'm all for knocking down absurd prices, but the decision to dig in puzzles me. The product is getting dragged through the mud on every audio forum, along with Massdrop's name and reputation. Its comms/PR people, assuming they exist, have undoubtedly advised a strong mea culpa along with a solid dose of public groveling, and have so far been ignored. It doesn't even matter if the design was ripped off or not. Assuming the Massdrop-Airist contract was written by someone with minimal understanding, it would have included indemnification clauses specifically for this purpose, allowing Massdrop to ditch Airist with minimal legal fuss. Perhaps Massdrop is financially stretched, and eating the cost of the product and reimbursing the backers would be ruinous.
  12. gepardcv

    The State of DACSES

    I've had a Soekris dac1541 since late summer last year (~9 months or so). It's really good. I made a volume-matching AB (not ABX) switching box, and I could not hear much difference between the 1541 and a Gumby. Sold the Gumby, it's not worth the desk space and it has fewer features (not to mention it has that obnoxious relay that snaps loudly at night in a quiet house when it has no USB signal lock). The original filters are pretty neat and have audible differences — admittedly with sighted testing, but that's way more than I can say for any other filter-switchable DAC I tried. I also recently picked up an RME ADI-2 DAC to play with its DSP. Very neat device. The built-in parametric equalizer works well. I've never heard a 007A+Carbon combo thump this hard after I EQed it to (as best I can without a measurement rig) match the Harman curve (based on Tyll's old measurements of the 007). On the downside, I think it increases listening fatigue somewhat, so it's probably not ideal for long listening sessions. For short periods (like 30min or so), it sounds pretty fantastic and impressive. With all DSP turned off, I cannot hear meaningful differences between the ADI-2 and the dac1541, but I must admit I didn't try very hard.
  13. gepardcv

    Goodbye Tyll. Happy Travels

    Congratulations!! Have a great time out there with Putt!
  14. gepardcv

    Pass Labs discussion

    I don’t have a good sense of what speaker specs make them efficient. I have a C-Note kit waiting for assembly, and was thinking of using that with this amp (8 ohm impedance with a sensitivity of 85 dB 1W/1m). That looks to me like it’ll get plenty loud..?
  15. gepardcv

    i'm on a roll... the kgsshv

    I wondered about this... what is the actual audio effect of high offset? I've never wanted to experiment on my own builds, but I keep hearing about (trigger warning! ) SinglePower amps having +/-150V offsets and such... Does it just distort like crazy? Make noise? Does it clip? Anyone have measurement charts showing the effect?