High level loop through subwoofer amp

[Breoyith]

TLDR
What premade boards can I buy to power an active subwoofer, provide volume and crossfade controls, and high level input/outputs

Hello,
I'm looking for information on adding high level loop through to a subwoofer amp.

I was given an older busted Boston Acoustics subwoofer and thought I'd take out the electronics and put in a premade class d amp board and subwoofer control unit.

Having high level input and output would significantly improve a system I have floating around the house and I can't seem to nail down the right search terms for the results I'm looking for.

Thanks in advance.

Ps: I was going to approximately follow directions I found in this video YouTube

He talks about using:
100 watt Amp Board TDA7293
Cross over board NE5532

Though I may need to find something with more power became it used to be a 220w active sub.

 

[Breoyith]

Here's the plate I'm looking to cannibalize.

Additional PS:
I thought this might be the right forum to post this in as my question is specifically about high level input/output loop through of the subwoofer crossover.

Please let me know if I was mistaken