This is a nice quality Aiwa TS-W35U Subwoofer. It features an impedance of 8 ohms.
Coustic subwoofers are designed to deliver high performance power at an unbeatable price. Polypropylene cone with excellent stiffness to weight ratio allows for high efficiency and high SPL. Large foam surround increases efficiency by further reducing weight. The all new Coustic subwoofers offer a solution for any enthusiast at an extreme value.
ANN-515 Passive Sub-Woofer Speaker, Metallic Silver Finish. 2 Front Air Port Tubes Damping Foam Assembled Inside 1 Pair 5 Ways Speaker Jacks Freq. Resp.: 23Hz ~ 500Hz Sensitive: 90 dB Resistance: 6.5 ohm Handling Power: Analog Min.100W/Max. 300Watts, Digital 500Watts. Weight: 37 lbs Dia.: 18.5"(H)x 15"(W)x 18.5"(D)