All in one plate amp.

That's a computer system subwoofer. That's fairly unique to that world.

You can buy seperate amps, but they aren't typically plate amps that drive the entire setup.

Buy an AVR and run all your speakers using the amp built into the AVR - that's most typical. (it's going to be cheaper for better quality than typical plate amps as well because AVRs are mass produced items rather than niche items).

You don't want something like that. For one, still the same mess, just sourced from a different location. Second, that is pretty unique, and the big downside to that is the ratig for wattage I am sure is way over spec. And third, even a low end dedicated external will probably outperform that by a mile so you're better off going the usual route. I can think of a couple more good reasons, but no. Any positives are still outweighed by the proper equipment.

butter and jelly please.

A good powered sub and a decent 7.1 AVR ($300+) with calibration (MCACC or Audyssey).