Frequency response: 20HZ 150Hz 4. Bass boost: 0dB to +12dB 11. Size: 345x260x68mm Connection: Black wire to earth Both grey & white wires for speaker Inputs to rear of radio Wire with black line is negative speaker side Turn gain up & enjoy.The item "KUERLE 8'' 600W Active Under Seat Car Subwoofer Audio Speaker Stereo Powered Amp" is in sale since Wednesday, June 24, 2020. This item is in the category "Vehicle Parts & Accessories\In-Car Technology, GPS & Security\In-Car Entertainment\Subwoofers". The seller is "mxqtech" and is located in Shenzhen. This item can be shipped worldwide.