@johnah5 Funny that you should mention the Hsu coax speaker, the CCB-8. I modified mine with an upgraded, external crossover, better wiring, internal panel damping, and high passed at 80hz, then going to a Audiokinesis subwoofer swarm. Amps are VTV Purifi mono blocks, Benchmark LA4. Remarkable! Serious definition, clarity, soundstage/imaging, dynamics. Here's a wealthy audiophile with a million dollar system that uses his Hsu CCB-8's to blow people away-