The Arachnid series SW-12SE subwoofer by Soundstream offers great sound at an affordable price. This Dual 4-Ohm woofer puts out 250 Watts RMS Power and has a mounting depth of 5.125".
This is a nice quality Emerson Subwoofer. It features an impedance of 8 ohms, and includes the speaker wire.
Injection-molded TPX Honeycomb cone woofer Multi-roll NBR Surround Progressive roll spider with woven tinsel leads Vented pole piece for heat dissipation Aluminum voice coil former Stamped steel basket 2" High-temperature aluminum voice coil 100oz. Double stacked strontium ferrite magnet structure Frequency response: 30-300 Hz Sensitivity: 85 dB Nickel plated push terminals