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Everything posted by gepardcv

  1. 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.
  2. Wait, did anyone actually determine that the heatsinks don't help cool the transistors? That's... counterintuitive.
  3. 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.
  4. 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...
  5. 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.
  6. 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.
  7. 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
  8. 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.
  9. 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.
  10. Congratulations!! Have a great time out there with Putt!
  11. 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..?
  12. 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?
  13. Reviving an old thread, sorry-not-sorry... DIYAudio Store is running a preorder sale on Pass ACA kits, $317/pop with a dual monoblock option. Includes the works. The default build is 7Wpc (class A), the monoblocks are 20Wpc. I'm really tempted, but would appreciate advice from more knowledgable people here. I've been interested in Pass designs for a while, and this is my chance to get my feet wet reasonably cheaply. But if I don't like it, I'll end up with more amps I don't use taking up closet space (cough)... https://diyaudiostore.com/collections/frontpage/products/amp-camp-amp-kit
  14. You mean the polarity is inverted on the drivers? That's nuts. Does it fail the wiring center/twisted test on https://www.audiocheck.net/soundtests_headphones.php? (Note the quote from the page on the subject: "That would be the last straw if your headphone's manufacturer made wrong connections, but it sometimes happens as reported with very cheap brands, or counterfeit replicas.")
  15. It's easy. Let's stop pluralizing "headphones". Instead of saying "a pair of headphones", just say "headphone". As in, "I think the SR-009 is a slightly-bright headphone" and "Stax wants to make improvements with the SR-009S headphone". Same for the HD800 and HD800S.
  16. If Stax currently sells every unit it has the capacity to manufacture, then it might not make sense to do any more marketing. Also, it's far from clear that Stax can scale up manufacturing if demand increases (and we definitely don't want it to respond to rising demand the other way, by raising prices).
  17. Let’s not forget that Focal warranty is non-transferable, so used units don’t get serviced, even if they originally came from an authorized dealer at full MSRP+tax. (Not that Stax warranty support is anything to boast of, either.)
  18. Could there be something goofy with your playback software or DAC, or the combination of the two? For example, I found that the ODAC clips nastily with software playback volume is set to 100%, but could not reproduce the problem on other DACs.
  19. It depends on the max current draw, doesn't it? For 20V with a SS Dynalo, for example, you need some heatsinking, but not a huge amount. For those builds, I just attach the devices to the aluminum chassis (through a pad, naturally) and it works well. For 30V with a SS Dynahi, I attached them to large external heatsinks.
  20. @penmarker: This is the standard HC advice on the subject:
  21. Not once you deduct the cost of running a company, building product, and paying taxes. With 8M gross revenue, it probably lost money — must have, or it would likely have stayed in business.
  22. Out of curiosity, which Russian forums do you read?
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