One of the suggestions is build your own subs. Your own homemade DEBRA/swarm system. Here is the amp used:
https://www.parts-express.com/dayton-audio-sa1000-subwoofer-amplifier-rack-mountable--300-811
And a cheaper alternative:
https://www.parts-express.com/dayton-audio-sa230-230w-subwoofer-amplifier--300-813
The setup instructions are on the "debra" website. Just need to build four small passive subwoofers. Build from scratch ( or pay a local carpenter/cabinet maker) with plans or buy a kit for 8" or 10" subs.
https://www.parts-express.com/dayton-audio-sa1000-subwoofer-amplifier-rack-mountable--300-811
And a cheaper alternative:
https://www.parts-express.com/dayton-audio-sa230-230w-subwoofer-amplifier--300-813
The setup instructions are on the "debra" website. Just need to build four small passive subwoofers. Build from scratch ( or pay a local carpenter/cabinet maker) with plans or buy a kit for 8" or 10" subs.