Well the B&K PT-5 pre-amp has an active Low pass section @80Hz, while the rest is thru the typical crossover network with in my speakers. Mind you it sounds very very good, I am mainly concerned with the matter of the B&K's output via a maxed volume control, the amps are not hitting peak power is my thought.
As for the Proton's - they are 110wpc, however, they are able to deliver 1500wpc transients for 200ms into 2ohm loads, or more, depending on the source material. They are very very powerful amplifiers. And with a S/N ratio of 120dB, they are very quite as well.
By way of example, I have an AB international 1100A which is rated to 550wpc, the Proton side by side (single amp) Is everybit as poweful, and, more refined. I also have an Adcom GFA-555 and the Protons beats it as well.
Again, it is my belief that the B&K hasnt the output to run two amps, but then I could be wrong, hence my question.
Thanks for the comments.