Most of you old schooler's will probably remember this....
1992'ish Polk Audio C4 Subwoofer:
Original MSRP was around $500. Not exactly a bass head's dream sub, but nice, clean hard hitting bass in a very small enclosure. I just picked this up off CL and it is in near MINT shape. Very cool design.
Specs:
Driver complement - Four 6x9 drivers monted in a isobaric push pull configuration
Enclosure type - 4th order bandpass
Frequency response - 25 to 150 Hertz
Sensitivity - 94 db @ 1 Watt @ 1 Meter
Recommended amplification - 25 to 200 Watts per channel
Impedance - 4 Ohm stereo, 2 or 8 Ohm mono
Dimensions - 8" H x 26.25" W x 17.125 D
Weight - 26 pounds
Pictures:
Video: