This is a nice quality Aiwa TS-W35U Subwoofer. It features an impedance of 8 ohms.
Alpine Type-R SWR-10D4 10" 3000 Watt Dual 4-Ohm Subwoofer With Staggering Power Handing And Ultra-Responsive Control Features: Alpine Type-R SWR-10D4 10" Subwoofer Fifth-Generation A New Level Of Type-R Performance Peak Power Output: 3000 Watts RMS Power Output: 1000 Watts Dual 4-Ohm Voice Coils Staggering Power Handing Clean Output Deep Bass...
Frequency response 25Hz-250kHz . Reversible top gasket. Large copper-wound Kapton voice coil. Auto tension push terminals. Flat Conex spider with loop stitched tinsel leads
Orion Cobalt Series 10 Inch 400-Watt Subwoofer - ORN CO104SFEATURES: Frequency response 39Hz-250kHz Reversible top gasket Large copper-wound Kapton voice coil Autotension push terminals Flat Conex spider with loop stitched tinsel leads Orion Cobalt Series 10 Inch 400-Watt Subwoofer - ORN CO104S