Amp and preamp on same outlet?

Loss of dynamics will happen.

How much/many dynamics will be lost in the same outlet?
How much/many of thom will be gained via dedicated linez?
Will there be anything more lost or found in the same outlet?

Move to a more efficient amp like Class D and no problem ever. I have both my 500w/ch monoblocks on the same outlet and dynamics match teh best I hear anywhere and are teh best I have ever had myself.

Efficiency done well is always a good thing.

My circuit breaker used to go frequently with modestly high power power sucking Class a/b amps.

Now the only time it might go is if I power up both 500w/ch Class D monoblocks at the same time. They never show any signs of strain or break a sweat running. Plus I can leave them on most of the time and teh impact to my power bill is negligible as quality power amps tend to go, so overall cost of ownership is lower as well.

If you have modern, reasonably decent gauge copper electrical wiring and a quality outlet, invest in a great noise reducing PC and conditioner. I use Transparent and MIT PC's and Transparent power conditioning with great success.

I agree with Ebm, +1