hi, i am looking for a portable amp for my grado rs-2. my music is on a 5g ipod 320 aac. i know you are going to recommend a source upgrade... but i really like moving from room to room within my house. my music preference is rock + pop. i am looking for a warm, thick, rich and detailed sound...

sorry double post

i was just wondering how loud an ipod is (in db) turned up to max level. thanks!!!!!!!

what is in your opinion the warmest, darkest, and detailed 12au7 or 12at7? i realize every setup is different but i was wondering if there is one or several tubes that are regarded as fitting this description. thanks!!!!!!!!!!!!!!!

i was just wondering how the er 4p compares to the grado sr60 when driven by a portable unamped. what would be the difference in overall sound quality? Music would mostly be rock and pop