The Paper Horn by Inlow Sound
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Diy 4 x 18" bass reflex subwoofer:

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You will want to stack a pair of these subs, otherwise the weight is not manageable.

I'm fabricating these for a customer, and based on prior experience, they can shake the house to its foundation! (should one so desire) ;^)

This fellow, when stacked, is configured as an 4 ohm load, though it could be 1 ohm, or 16 ohms. According to Hornresp, 4 of these cabinets develops 115 db 1 watt 1 meter with a watt going to each driver, so it took very little to convince me that this idea deserves life.

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The desired audio spectrum is displayed on the left side of this graphic. The 3db down point is about 18hz. This output is with 1 watt input! Not too shabby...

​Below: the impulse response is strong, and for first octave bass, dampening of the ringing is quite reasonable.
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I prefer to tune my encloses with the bottom half of the impedance curve higher in impedance the the front half.
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Max acoustic power developed with 8, 18" drivers at 1w1m (above), and the power to each channel (below). Xmax is reached long before power restrictions are exceeded.
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