I've had an (unfounded) thought that perhaps, current-out (i.e. very high output impedance, current source) amps could increase isolation in open-back isodynamic headphones by "stabilising" the membrane, counteracting EMF created by external sound on the membrane. It's unfounded and I can't...

Does anybody own at once a good voltage-out amp and a current-out amp? I'm wondering about possible differences in external noise isolation between these kinds of amps.

Quote: I suspect the 10-11 kHz peak is due to driver's dimensions, not the cup..

Wow, just when I think that it's entirely doable to 3d print new, larger cups for Fostex, I read about Alpha Dogs. When I think that I could actually do that as well without much trouble - I see that thread. Fascinating!   Sadly I don't have enough properly free time to dive into it yet, but...

Don't recall exactly, but tracking number is carried over to Russian post and iirc it can also be tracked via usps.

jgray91, bluemonkeyflyer,   I've been and still using beyer gels on a DBV-like mod without much problem. I don't really recall precisely how they sounded initially, before the first adjustments, but now their sound doesn't produce any fatigue. Granted, I do listen with stereo convolution...

Quote: You can slap them on top of cups or attach them via a DIY lip. :)

Indeed, seems that wool-type materials have significantly better absorption than foam materials. So it's likely preferrable to use fiber instead of foam as cup filler. Though still, impedance matching is present, so a boundary layer of foam (e.g. in cup wells) would be beneficial. That could...

Midrange is doable with BMF's mods entirely, these seem to address the 11k resonance problem. Or it could be the quirk of measurement actually - all the RMAA measurements seem to be somewhat too flat after 10 kHz.. I think that could be done in less destructive way. But I'm not going into the...

Here's FR of an mod of one Russian guy. White is unpressed earpads, green - pressed. Notable is flat FR above 10 kHz. The mod is very extensive. He picks the drivers, removes stock paper, saws through metal plates, mades wooden earcups no less than 10mm thick, and does custom damping, cup...

Where have the DBV#3 measurements went to? Don't see them anymore... It seems that the main component of modding is damping the driver, that's what seems to provide flat responce. To get flat responce above 10kHz one would have to get inside the driver and damp from there, I suppose.

Have you pinched holes through transpore as well? (They shouldn't work the other way anyways) Try covering them, with transpore for example.   Holes seem to provide a HUGE boost of deep bass. Mine have +25dB at 20Hz, I can't say it sounds muffled, it's more like I'm sitting inside a huge...

Made lips for Beyer gel earpads out of pleather, as I grew tired of tape attachment: takes a lot of tape, some time, not very repeatable - every time I reinstalled the pads, I got them placed differently, a bit messy, and is too tight - not possible to make a lot of space under the pad that way...

Quote: I do have problems with damping, but they're of another kind. I have way too elevated bass, +20db by 20hz. Hence, they are actually dark, but to me, they're bright.

Quote: From what I understand, you just have to substitute the program's jar file with beta jar on Mac. Don't think it actually has any fatal bugs, what we're interested in is anyways not OS-related, just internal calculations.   By the way, do you use your headphones with crossfeed...