4 D4 - Image Dynamics 8 350W RMS Dual 4-Ohm ID V. 8 Dual 4 ohm ID V. Optimized motor structure that uses finite element analysis for symmetrical and long linear excursion. Re: 1.95/7.8 ohms. Sealed: 0.25 - 0.45.Ported: 0.5 - 1.0. 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 "IMAGE DYNAMICS ID8 V. 4 D4 8 350W RMS DUAL 4-OHM ID V. 4 SUBWOOFER SPEAKER NEW" is in sale since Friday, May 1, 2015. 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.