I don't believe I've heard it yet from a FiiO but just making sure it's there. I have some very low impendence and easy to drive 16 ohm IEM's that are sensitive to that kind of stuff. They aren't expensive, nor do I use them often, but my O2 has a slight problem just as you turn the volume up...

I rewrote some recommendations regarding the choice of amp for our soon-to-be-overhauled web site. It was old enough that it discussed our retired Smack kit, so it now includes Mainline instead. I won't post it here because that could easily be construed as advertising. But It should be up on...