Bass leaves after amp warms up?

I've been following this post from the beginning but do not remember if the following has been asked. Do you know anyone else that has a similar system that you could spend some time listening to? I'm wondering if the problem is tied to a form of listener fatigue. I do not mean to offend. I ask only because somedays I can listen for hours on end with no perception difference and on others it goes quicker. Especially if I have had to mix sound for a band the day before. The patterns of the sound quality coming and going do not overtly suggest this but I thought I would throw in on the "grasping at straws".

Fish,

Here is perhaps one of the least expensive amp options out there I have seen that has similar power to your integrated but also advertised ability to double down to 4 ohms. SOme good reviews out there on it, though I have not heard, but low cost might help make it a viable option to consider at some point. Do the SPL meter test first though in order to get a clearer handle on what is going in currently.

Class D audio amp

Hi Atmasphere:
I lost the bass yesterday after "looking" for it all day.
I turned off the amp as you said and shortly after it was back.
But there is no pattern yet..I'm working with this procedure right now..
Today I played a Record with full dynamics & everything sounds good.
I am going out for the day and will listen when I return.
I have noticed better response during the am than pm but again it's not really consistent.
I'm working on acquring a SPL Meter probably from Radio Shack unless someone I know takes the time to visit me.
I have a portable cd recorder & plan to record when the bass is there & not-maybe hear the difference from the cd I make.
Thanks
Tony

Does anyone know if all the amps in question are MOSFET outputs??

I spoke with Musical Fidelity and was told they are High Current and go low 2ohms
He insisted I don't take the cover off the top