HeadRoom Cosmic

Pros: good sound. portable.
Cons: expensive.

I listen heavily to classical and rock and have a hard time using any headphones without using the amp. The amp provides the Headroom 'process' that provides better depth to the sound which lets you listen for longer without getting tired. In addition it...

Pros: smooth, balanced sound
Cons: recessed RCA inputs

I use this amp with the Sennheiser HD 600s. The sound is very clean, with tight bass and a smooth midrange. The Cosmic has a very quick response, making it perfect for music with a wide dynamic range, such as rock. Classical music (especially strings) is...