@rhythmdevils sent these to me just before I decided to move to TX, hence the delay. I think I can honestly say that I think I've finally put my shit back together now. I still need a few more items, like more storage, and a real desk! I was thinking of getting myself a really nice desk, but I think those funds will have to go toward an APx555. Words cannot express how difficult it is to stay organized with all those boxes of gear! The M7 is a dark warmish sounding IEM. Pinna gain is tuned to a minimum, just a bit. The upper mids and lower treble are scooped. Basically those into a stereotypical Chinese IEM kind of voicing that enhances the genre of beautiful female vocal should stay away, far away from the IER-M7. Think of the tonal balance of the M7 like the Andromeda, but without the mid-treble peak, or like the Andromeda 2020, but with crappier technicalities: the resolution isn't anywhere close, the upper mids on to the highs are OK, the top octave is muted, the lows to mids are veiled like the HD650 on mediocre amps. I sense a lot of distortion. My bet is high second order just as much third order. I do find the frequency response agreeable and rather smooth throughout the audio band. This is the M7's greatest strength. The rest is rather questionable. For now, I will just provide the frequency response and impedance. I'm trying to get started on these, so doing these few measurements tonight will force me to provide distortion measurements maybe tomorrow. Sony IER-M7 Frequency Response Sony IER-M7 vs Andromeda 2020 (WHT) Frequency Response Sony IER-M7 vs Nair (WHT) Frequency Response Sony IER-M7 Impedance Higher source impedance can be expected to lift the upper mids and lower highs.