Not really... The M40fs is one of the flattest headphone I've heard, actually. "Very recessed upper mids" doesn't characterize what I remember about the sound of that headphone or the D40fs I recommended (and own for well over a decade). Perhaps your reference for 'neutral' is a more...

Given your requirements, I can't see a better candidate than Audio-Technica ATH-D40fs. Selling now for 49$ on Amazon, which is in stark contrast with their original price in the late 90's (in the vicinity of 150$). A dated design but can still hold its' own even against it's newer siblings...

Dark and airy are usually mutually exclusive attributes. If you are looking for a dark headphone with great spatial representation, I don't think there's anything better out there than HD650 (for the money). But you need a very good amp to tap into their potential. They'll do OK even with a...

I have no experience with Pro80, but I do own the 2050 and several Superlux/Samson headphones. To my ears and my music of choice the 2050's are not as sonically competent as the Superluxes are. Resolution is lower, spatial presentation and accuracy are (much) lower. Tonally the Takstars might...

Have a look at Superlux HD681B, HD668B or Samson SR850. All 3 are variations on the same theme, all 3 relatively neutral sounding and highly detailed (for the price) headphones. All 3 are on the bright side of things and all 3 can be EQ-ed successfully according to taste or necessity. Neither...

I'll put another plug for the AKG K240S. The entire K240 line handles rock music very well, while retaining the AKG house sound (clear and well spaced out). They're also built very well and will, most likely, last for decades.

Impedance can be a bit misleading. In absolute terms a low impedance driver would present most difficulty to an amplifier, as it is with speakers. Low impedance demands more current from an amp. For speakers that can be an issue, as the current demands can be very high indeed (in the order of...

I'll just copy/paste here a response I gave in a similar thread:   They're very similar. The Samson SR850 is essentially a Superlux HD681B, rebranded.   Some people assumed they're identical to the HD668B (cup design shared some more similarities than with HD681 line). However they are not...

  What the EQ does is increase the quantity of certain frequencies, not their quality. If the highs are recessed and poor quality all you'll get is the same poor quality treble, only louder. If they're good to begin with, then an EQ can help.

The NX1 doesn't have a DAC section, it's just an amplifier. The USB port in the back is for charging purposes only.

They're very similar. The Samson SR850 is essentially a Superlux HD681B, rebranded.   Some people assumed they're identical to the HD668B (cup design shared some more similarities than with HD681 line). However they are not. Driver magnets and impedance are different, 32 ohm for the SR's and...

Given your music taste I think Audio Technica D40fs would be a better fit. Their price has decreased significantly over the years, to about half of what I paid for them some ... 10 years ago.   In terms of performance it's not far off from it's more recent sibling, the M50(x). The sound...

There isn't much between them in terms of SQ. Just different flavors of the same thing, mostly. The HD330 have a bit more dynamic sound, which goes a little better with rock music. The 681 EVO has a more laid back presentation with more relaxed treble and slightly better soundstage. If you...

Can you share a few more details about your setup and what you're looking for? More specifically: what will the headphone amplifier use as source with your computer? A soundcard or you have already a DAC? Would a dac/amp combo function as a substitute to what you already have in your main...