Internet says ~ 90 db sensitivity. You don't need huge power. IF you have them hooked up to an arc welder, doesn't mean you are using the rated wattage. Maybe the load is demanding and you require high current/low impedance stability but most quality amps are good there (note that bridging channels diminishes this headroom by a factor of 2).
You will get more bang for buck with a nice integrated, most have digital inputs (build in dac these days). If you arnt price sensitive: Mcintosh, Luxman, Accuphase, Bryston, etc
If you are price sensitive you have literally hundreds of options from Nad, Yamaha, Dennon, Marantz, Rotel, etc
If you really want huge clean power, Class D is the way to go these days. No excuses needed for modern class D especially the premium modules from Hypex and the like.
https://www.buckeyeamp.com/shop/amplifiers/hypex/nc2k/1_channel