Hi, I have a pair of PSB M4U1 running off an iPhone 5 most of the time, and I just feel like they have to be pushed quite loud before the music stops feeling so flat, and then only a little louder and it will start distorting a little. I'm no audiophile so I'm not sure how to describe it better. I was hoping to get a portable amp to hopefully open up the sound at lower volumes...
At the moment I'm contemplating the JDS C5/CD5 (not sure which out of those two) or their little CMYOBB, if just a little more power is all the M4U1 need. I prefer a more neutral sound (not too bassy) but with with dynamic instrument separation, I guess.
I'm also contemplating:
http://www.peachtreeaudio.com/shift.html or
http://www.headphonia.com/Arrow-6NX/6TX/Headstage-Arrow-6NX::10144.html?XTCsid=bac630d1250348ac5c1eb643fbfdf36c or
https://www.oppodigital.com/headphone-amplifier-ha-2/
Any thoughts and advice would be appreciated.