But you do want to only use rechargables. Normal batteries screw with the sound.
I still have my amp that I bought at the end of 2007. It has the separate adjustable gain for the Left and Right.
I use to use it at work with my DT770's but now I use it when I want to listen to my ipod and DT770's in bed.
Wow, gary has sold 7400 amps so far.