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Interesting, lots to respond to. But I'm just curious. What exactly is the design of the Geddes sub? A cursory googling yielded little.
That's because it's proprietary It is a unique bandpass design where the driver is inside the cabinet with either multiple small ports or, in my case, a large passive radiator on the outside. The driver is a B&C 12TBX100 which is incredibly robust.
Hmmm. I guess I don't understand how a bandpass sub works. Is this the driver you mean? With a vented F3 of 83 Hz? https://www.parts-express.com/bc-12tbx100-12-high-power-woofer-8-ohm--294-569That doesn't seem like a proper sub woofer. What am I missing?
I've been reading glowing reports on this Dayton Audio driver for subs. Does anyone have experience with it? 18" with an Fs of 18 Hz and an efficiency of 93 dB, $245-$260.https://www.parts-express.com/dayton-audio-rss460ho-4-18-reference-ho-subwoofer-4-ohm--295-472
Your up against the laws of physics, with bass there is no (cheap) shortcuts.