Go with a tube pre amp and a solid state amp. Those 15 inch woofers need the control of a solid state amp IMO. I used a conrad johnson pv 10 pre with them and it was no small improvement over a solid state pre,but when I tried a tube power amp, the bass got really loose and sloppy.Look for a used pv10a and a nice little solid state power amp, like a Mccormack dna.5. They really dont need much power,just a few GOOD watts. Happy hunting,
Mike
Mike