Hey guys and gals!   I am due to receive my brand new Senns HD598 tomorrow morning, along with an iPod Video 5.5.   Has anyone ever tried those in a combo, without a portable amp/dac?    I'd also love some suggestions on a portable amp or amp/dac that's a proven great pair with those...

Hey there, guys and gals.   I just bought an iPod Video 5.5 and stumbled upon a couple of forum topics online, which were discussing at length something called "Rockboxing".   I did some research myself, however, I'd really like some synthesized input from you guys on what exactly the...