So what kind of phones are these? :))     I do have the guy's permission to post this pic.

Looking at frequency graphs of single BA headphones, one can see why a couple of drivers for the low end and an extra for the high end might be needed, since both low bass and 12khz+ tail off. Having heard headphones that go down to 20Hz, there's no question of the advantage.   But beyond a 4...

Hello, from Londres. that's London to people who don't speak French.   I'm not french however, just having a momentary lapse of language.   I listen to equalised Superlux HD681 on an O2/ODAC.   I'm calling myself theequalizer in homage to an 80s sleuth/justice series that I absolutely...