Hi. I just bought a new rsa hornet yesterday and left it to charge with one of the included maha 300 batteries last night. This morning, I disconnected it from the charger, plugged it into my macbook with a mini-mini, and to my hd650. When I switch it on, the power switch glows orange/amber...

Hi all. I'm looking for an amp that would be suitable for my current/future headphones. Or perhaps I'm wondering if an amp will be required or is the best use of my $$$. First, some info on the headphones I currently have and plan to get in the future. I currently have a stock hd650, as...