Amp/preamp combo for B&W Matrix 801's

i use them biamped.eagle 2 for the bottom and 2 mc 275 commemorative bridged for the top.
also use a maughan box and happy as a clam.
they are hard to drive with a tube amp running full range although big arc amps do the job decently well.
bass is much tighter with ss amp on the bottom however.