Hi @yyzsantabarbara
I own the Luxman 507ux. I totally hear where you are going with this, since this amp did the same for me, but I do suggest that another way to extend your speaker’s range is great room acoustics.
For a fraction of what you spent on your preamp/amp, I’d spend some money with GIK Acoustics. Great advice, and biggest bang for the buck.
Over and over I’ve heard good room acoustics make speakers sound bigger and better.
Best,
E