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5 spec sheets, checked against datasheets Filter and sort the whole list
Straight from the spec sheets
Klipsch R-120SW reaches down to 29 Hz on the maker's own figure, the lowest of the 3 subwoofers here. At the other end, Klipsch Reference R-8SW stops at 38 Hz.
Klipsch R-120SW is rated to 116 dB peak, the highest of the 3 here with a published figure. The quietest, Klipsch Reference R-8SW, tops out at 108 dB.
Klipsch Reference R-8SW at 15 lb. The heaviest we list is Klipsch R-120SW at 31 lb.
5 spec sheets
The amp is built in, so one cable from your receiver is all it takes. This is what nearly every home subwoofer is; the amp is matched to the driver at the factory.