Free Air Resonance (Fs): 32.35 Hz. Equivalent Compliance (Vas): 33.67 L.Frequency response: 24 200 Hz. You will be issued a Return Authorization Number. In order to maintain an inventory of 100%, Brand New, A-Stock, untouched products, all sales are final. We ask that you please be sure you are ordering the correct product. The item "JL AUDIO 12TW1-4 12 600W MAX 4-OHM TW1 SUBWOOFER LOW PROFILE THIN SPEAKER NEW" is in sale since Wednesday, October 8, 2014. This item is in the category "Consumer Electronics\Vehicle Electronics & GPS\Car Audio\Car Subwoofers". The seller is "woofersetc_outlet" and is located in Los Angeles, California. This item can be shipped worldwide.