If you are listening to Diana Krall, and you hear Katy Perry, the problem is much larger than amplifier technology. You either have one heck of a malfunctioning system, a set of speakers that were dropped out of a truck before being delivered to you, or you are experiencing neurological problems that require immediate medical attention. I'm not being facetious...Katy Perry and Diana Krall sound nothing alike, aside from both being female. If that's genuinely what your ears heard, you have bigger issues than deciding what amp to buy.
bcgator, it was an analogy. Diana Krall has a warm voice and the Ice Module made her voice sound cold and thin. Katy Perry has a cold and thin voice...hope that clears things up. ;-)