I bought my ER4s and total airhead 1.5v 3 months ago. The sound is great. I am looking to upgrading in the near future. I talked with Headphone and they suggested the Cosmic amp. Is this the way to go our would it be better to keep my airhead for portable and get the something else like a...

I've had my total airhead for about 2 wks. I use them with my ER4S. Great sound. However, I was wondering if this amp is the best for these phones. What is your opinion? I can return them to Headphone if I want to upgrade.

I just got my ER-4S yesterday. I find that they are a little uncomfortable. Are the foam earpieces more comfortable. How long does it take to get use to the feel of the tips in your ears? The sound is very good, but I can hear the cord when I move. Any suggestions for that?