My next DIY sub will likely be a pair of Devastator horn subs.
https://shop.gsgad.com/collections/horn-subwoofers
My only concern is what tuned frequency version to buy, 19Hz or 28Hz ?
For the moment I am running a pair of Dayton Audio 18" Reference Series HO Sub-woofer Kits that I modified to double the cabinet thickness buy adding 1" of Baltic Birch on all sides. https://www.parts-express.com/Dayton-Audio-18-Reference-Series-HO-Subwoofer-and-Cabinet-P-300-7094
Power is provided by a pair of Crown XTi4000 amps in MONO
I would like a Speakerpower amp or a pair of big Krells to drive them.
https://www.speakerpower.net/store/p31/SP2-8000-HT_Dual_Mono_Subwoofer_Rack_Amplifier.html
At over 200lbs each, I can no longer lift them onto the stands by myself.
Before I moved a few years ago, I had them on stands I built that absorb vibrations and standing waves.
I really need a larger room... 😪