Just a little warmer of a sound. My friend has a rotel amp that we tried at my house and it was rated at 350w and for some reason it made my speakers "sing" with more bass, where when i switched back to the parasound it sounded like it was lacking that bass. That doesn't sound too likely to be actually happening. Was it a level matched blinded test (and quick switching between)? Have you tried using equalization to address the boost in bass you want?