I don't know how or why, but this amp does sound kind of thin and bright, but only slightly. I have no clue how it could be kind of bright since it measures flat and is supposedly just as transparent as the O2 (or so they say).
I haven't listened to this thing in weeks. The last thing I used it with was 2-3 different full sized CD players. I was listening to some Jpop with the 65th Anniversary and Magni and wanted to rip them off and fling them due to really harsh recordings.
I switched to the Headroom Micro and it was so smooth and just perfect. Both measuring flat and both transparent, so I don't know what's going on. All the harsh tracks on the Micro were still harsh/bad but a lot more bearable to listen to.
So I think I'd prefer the Magni with something like an HD-650 or a warmer sounding headphone. The 65th is kind of warm, but not as much as the HD-650 etc. It doesn't sound that warm on the Magni really. This is weird since the Micro I have isn't warm at all. The Fiio E9 is actually warmer.
Maybe the Magni (or sources) are just ultra revealing of crap recordings and all their nasty peaks, but highly unlikely. The Micro is certainly not colored.
Nobody finds the Magni fatiguing with the SR-325is or a DT-990? I did try to make sure to try many different sources. I made sure none of them were too warm or colored.
Hmm, maybe it's just not so good with the K702 65th Anniversary. Bad synergy maybe. It's not that bad really, but I prefer the Fiio E9 for the Q701/65th.
I think overall I still prefer the E9 despite not being as transparent.
I bet the Magni would be best with a slightly warm sounding source. I like how it sounds with my old Sony S380 Blu-Ray player. Uses an AKM DAC chipset, but doesn't really sound much like the Modi. It sounds pretty warm somehow.