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2 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 2 subwoofers here. At the other end, Dayton Audio SUB-1000 stops at 30 Hz.
Klipsch R-120SW is rated to 116 dB peak, the highest of the 2 here with a published figure. The quietest, Dayton Audio SUB-1000, tops out at 110 dB.
Dayton Audio SUB-1000 at 29 lb. The heaviest we list is Klipsch R-120SW at 31 lb.
2 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.