How do you guys go about it? In my experience when inputting a volume controlled device (iPhone) into a separately controlled device (ie car stereo) the volume of the former is very important. Are any portable amps able to receive a "digital" signal (possibly the incorrect terminology) that is...

Hope you can help me narrow down my potential picks as well as refine my thoughts. I'm a student so noise cancellation (active or passive) and minimal leakage are of importance. I also appreciate bass, but I'm not a basshead. Currently I have a set of TripleFi 10's that I'm in love with; they're...