Bass leaves after amp warms up?

I second that. You'll find my comment on the PS Audio P3 on page three but the P5 will be the same.

Good luck

Could the line conditioner have been robbing dynamics even if no components were pluged into it?

Seems extremely unlikely to me. Your AudioPrism Power Foundation Conditioner appears to simply provide a bunch of outlets and some passive noise filtering.

With nothing plugged into it, unless it is defective it should be drawing negligible current, and have no effect on line voltage. If it were defective and drawing enough current to affect line voltage, it would be getting hot and/or its breaker would trip.

Assuming that it was turned on when you made these observations, I suppose it is remotely conceivable that it could have some effect on noise conditions on the line, that might affect noise entering components plugged in elsewhere. I suppose it is also remotely conceivable that if it is located close to susceptible cables or components it might affect them to some small degree by radiating EMI or RFI to them. And if either of those effects were occurring, I suppose it would then be remotely conceivable that the sensitivity of your audio components to those effects might change during warmup.

How remote is "remotely conceivable", IMO? If I were a betting man I would be happy to offer 1000:1 against those possibilities.

Regards,
-- Al

I agree with you Al
You are very knowledgable

Fishing, I'm pretty sure I suggesting removing the power conditioner on page one.

The problem with most power conditioners, whether passive or active, is they force you to use a common power cord. If you get a voltage drop over that cord, it will rob the amplifiers of full output power. This is audible and measurable. If your amps draw more power after warmed up, there could be a tipping point. Maybe that takes about 1/2 hour?

Our amplifiers are quite unhappy with most power conditioners, especially the regenerator kind.

If the lack of a power conditioner continues to fix the problem, ditch the conditioner, or just use it on your source components.

I ordered cablepro revelation power strip from Gene rubin audio.
This has no filters switches or fuses in it
I need the convenience of 8 outlets
Are you familar with this product?