Stuff I have that I do recommend:
FLC8n, ALWUP UPC630
Stuff I have that I strictly don't recommend:
Sennheiser HD 280 Pro
Takstar 82 Pro, new 1.6m cable version
And some other headphones not worth mentioning.
DACS I don't recommend
Hidizs DH1000 aka Tempotec Sonata
Headphone Amp Inventory:
Scarlett 2i2 audio interface. Excellent DAC.
FLAC files as much as possible. Scarlett 2i2 audio interface, Harman Kardon HK 670 stereo integrated amplifier
Other Audio Equipment:
Dali 2002 speakers
I don't have a specific taste in music. I like everything except country generally. Therefore my references are rich and my demands high.
I have no sensetivity against lows, mids or highs. I like full bodied sound, the way you imagine the producer with his high quality monitors would like the track to sound during mastering.
I enjoy bass. When it's presented as the producer intended it to be. The above track should sound wide and Bass should both thump and vibrate with a slow roll off in the sub region. On headphones that are not capable of presenting bass correctly, that detail is lost and the bass will just thump.
I hate boomy bass, that effect you get when you overextend the speakers capability with equalizers and bass gain. And I hate bloated bass that tries to cover up the fact that the mids and highs are crap and makes everything sound muddied.
Not a big fan of recessed mids, the V shaped tunings where the female vocals will have precense but not male ones.
Generally like bright headphones combined with warmer amp/dacs. Cirrus Logic DACs are a good example of slightly warm DACs with usually excellent Airy sound and stereo imagin.
Binural/3D sound, Airy sound, width, depth:
Definitely very important to me. Important for Ambient music especially.
Tracks I test new sound gear with (reference tracks originally in FLAC):
Track is extremelly wide and deep (binural), easily shows when sound gear can't handle it in regards to width and depth, clarity in highs
Bass, mids, width and depth. Producer is using stereo imaging very well.
The spotify quality doesn't do it justice but at the 1:17 mark a wave of bass and cello comes that is just a marvel of sound mastering, it will make me shiver played through good sound gear, and is an easy way to spot bad gear.
Testing female vocals, strings and soundstage