Bass leaves after amp warms up?

I did listen to the two files but had trouble identifying the difference (my current system does not go very low in the bass, however). Both sounded extremely bright and spitty. How did you record them?

I just put a cd recorder in my listening position.
Recorded one when the bass was full then 1 hr.later when it was not..
One version gives the groove of the song while the other is lacking

Krell man, I take it you 'are' no more:) Those are some serious reviews.

Krellman, Well said. FWIW, I agree with I with you on all three points.

One of the reasons I recommended the SPL meter was for the OP to see for himself that his problem was not with absolute volume level of the bass. He just likes his system's sound when it is cold and the HF's dominate the sound and the sense of speed that can impart to the bass. Most of us, I think, would not consider this to be a balanced sound, but he does and that is why most folks couldn't really figure out his problem or how to solve it, we just don't listen to things with his ears nor his preferences. We have just assumed that he listens with our ears and priorities.

As someone suggested, if that is a sound he really wants, he needs to evaluate his components after they have warmed up and select components that will give him the overall sound he is seeking. A daunting task I suspect.

If you read Atmasphere's and my posts, you will discover that with this school of thought, a warmed up amp is in fact detrimental to optimal sound in that the outputs are then operating with reduced current. It does perform better when cold. But only because factory settings are deliberately conservative in an effort to allay future warranty issues. As I stated, most people don't care about this even if they notice. Factory settings are typically lower than optimal even when cold. Published specs have nothing to do with this issue so the manufacturers just cover their ass. In a class A/B amp for bi-polar devices, about 150ma per ch. is optimal regardless how many outputs there are. Mosfets are a different story. Typically between 200 and 300 ma per ch. Bottom line is heat is the killer so whether they're bi-polar or mosfet, if the temperature of the heat sinks at idle is around 120F, that amp is going to sound great for a long time. I don't believe this is an issue with class A amps, however.