Many thanks Ypoknons & Leny for the quick and helpful answers.   Quote: I hadn't seen that thread yet - thanks, it's good information and helps address my question of whether or not the DT990 / 600 really needs "huge voltage swing to shine".  Also noted on coloration, sounds like I...

Realize that there are many similar threads, did some searching without a direct answer.  Apologies for new thread, but will try to phrase in a new way.   My question is about voltage swing in amplifiers for use with high impedance headphones.  How much is performance really affected?  I...

Sound pressure vs. perceived volume   Apologies for bumping an old thread - just didn't want to start a new one with many similar topics already.   I'm using a high impedance headphone (DT990 / 600) with a portable headphone amplifier (iBasso D4) - usually the volume is set between 12 - 2...