Bumping for visibility of the below.   Quote:

Okay, so I have a question about the headband adjustment mechanism. On one side, it's become very loose and the system essentially doesn't grip onto the dots very well, sliding up and down too easily and often by accident.   Anybody had this happen or have any ideas on how to fix it? I figure...

The mathematics are covered in a DSP course and are clear and unambiguous.   This is the result with that perfect sinc (brickwall) filter. Keep in mind that the sinc filter has infinite support and is non-causal. The correct output now depends on values potentially infinitely in the future...

Sorry, I tried searching but didn't readily find the answers I was seeking, and I figure some of you may have a better perspective anyway. It's been a while and I'm out of the loop. Thanks.     Anybody know Can the E11K be used while charging? My understanding and recollection was that the...

More likely a measurement artifact than anything else. How many runs for each source did you do?   I mean, you can also measure the electrical output of the amp while it is driving those headphones.

So what's the channel tracking like? Technically this is the type of thing that wouldn't be that hard to get a decent ballpark estimate on via loopback testing via an audio editor or actually I think even the RMAA calibration, but a general impression is fine too. Any noticeable problems in...

  For methodological purposes, how about four tracks? Two with HOT and two without. That way there's repeatability and we can see if something in the test changes between two runs.   Or make it a ABXY by labeling A as with HOT, B as without, and X and Y being unknown, so people can try to...

  The E17 is not capable of anything close to 1 W (1000 mW) output, so you couldn't have put that much into the headphones. The amount depends on the headphone impedance, volume setting, input level, etc., but suffice to say, it was not near the limit, whatever physically that really...

I mean, seriously, if you designed and oversaw manufacturing of a great new product (much less one never been conceived before) and saw skeptics maligning it, wouldn't you explain how it works and part of the process? I mean, you would have to keep certain details under wraps, but resorting to...

  This is really a gross oversimplification of little value, but if you were to place HD 800 and LCD-3 on an axis, HD 650 would probably be somewhere in the middle in most or some respects and not way off either side. Except in price. It's definitely less expensive than the other two!

  There are some things the amp could do that may impact how soundstage is perceived but that would involve intentional deviations that would result in different things for different headphones. Definitely one thing it could do would be to have some series resistance on the ground return, for...

Well said, bigshot. Some people know of the above but don't believe it, but a lot of people don't even realize what's going on. Some speaker / headphone measurements and at different positions really should be a wake-up call.       Now you're making me wonder how many times in the history...

In lieu of any technical response from the company...   From the Facebook page: Good to know.     Well, we got some nice spectrographs out of this adventure, anyhow (and by "we" I mean we're totally a team of other people spending money, other people using their time, other people using...

  Cool. Nice to see.       Guys, could you help me out here? I haven't read audiophile writing in a while. Everything else aside, what do people even mean by "opacity" in this context? I guess an actual crossfeed circuit would definitely not be audibly transparent and so could said to...

Sorry, only have time for a quick skim through, so this response will be shallow, but you use the headphone output compared to the balanced line output of the same device?   I'm pretty sure you'll find the output impedance to be different for the two outputs (and probably not the balanced...

  Audio is not moving very quickly. If you look at where most of the money and engineering talent goes, it's not there (and most of it into the chipmakers, people doing the mass-market stuff). Recent technological breakthroughs don't really have much impact on what you can do with regards to...

First of all, the limit back in USB 2.0 days was 0.5 A (at 5 V). I think about everybody can expect a USB host to support 2.0 and that level, but proper USB 3.0 or higher ports supporting higher draws than that aren't quite ubiquitous yet. That said, some smaller, more mobile devices may not...

  Just in case this was a real question (at least in the first part), pink noise is a technical term for a specific type of noise, the kind having equal energy in every octave. So equal energy between 20 and 40 Hz as between 40 and 80 Hz and so on. This is as opposed to white noise (equal...

Listed specs may not be completely honest or really listed in ways that are completely comparable, but that's likely not the most relevant issue here.   The thing to realize is that these are maximum levels possible by the electronics. The vast majority of people on most of these devices on...

I don't know if I'd trust HeadRoom over design engineers at a manufacturer with respect to compensation curves for different headphone types.   IIRC it was Tyll who did most of their database of measurements for HeadRoom; when he left to do InnerFidelity, he does them now on a contract basis...

  It's still coming from the real world and is continuous (not a true discontinuity), just sometimes with some ultrasonic content maybe.   If that doesn't fit into Nyquist frequency, it gets aliased down or filtered out somewhere in the A/D chain, in various parts (maybe both to some degree)...

For what it's worth, I've tried all kinds of cable extensions and adapters and did a partial recable of a headphone that was breaking down. Usually it's the low-end where there's more room for things to be bad, right? Or do people say it really requires silver, cryotreating, or whatever else?

  Based on what listening distance? Or rather, which angles roughly are you recommending? Just wondering more about what your take on it is.

I'm pretty surprised anybody could stand to listen that loudly, to be honest. For HE-6, I'd believe it. For HE-400? That seems nuts to me. Pretty much if some music is pegged at an average level of -10 dBFS or higher, nobody's listening on 110+ dB SPL peaks. At least, I hope. The time when those...

  No, that's not how it works. Just check the circuit diagram. The AC goes into half-bridge rectifiers into filters and 7812 / 7912 linear regulators to generate +12 V / -12 V rails. It's those +12 V and -12 V rails that charge the batteries and also power the electronics (the three op amps)...