All of this hard work and engineering has lead to the incredible reputation now enjoyed by the SA series worldwide. We are very proud of what these woofers are capable of and we believe that they are one of the best woofers on the market today in their price and power range. Overall Diameter w/ Gasket: 15 5/8.Recommended Box Specs (Sealed): 2.5ft^3 (Yields F3 of 41Hz). Recommended Box Specs (Ported): 3.5ft^3 (Tune to 35Hz, Yields F3 of 28Hz). 19.0mm XMax by 70% BL method oneway (38.0mm peak to peak). Thick black anodized aluminum voice coil formers for maximum strength and heat dissipation.
4layer copper high temperature voice coil windings with 45mm winding length. Double layer permanently bonded high strength Nomex spider pack for maximum longevity and durability. Thick flat tinsel lead wires tied down to the spider to prevent lead noise and breakage.
Custom tooled triple joint support ring. Custom tooled frame spacer / ventilation ring.High efficiency airflow management integrated into the motor for maximum voice coil cooling. Dual Aluminum Faraday rings for reduced inductance and inductive distortion (pole cap and magnet ID). Specifications are measured after about 5 minutes of break-in time. You will see the CMS loosen up another 33% after some serious play time which will both reduce the FS and Qts figures of the drivers. Some Re variance is shown based on coil temperature from break-in period. D2 is closer to 4.0 in series and D4 7.0 in series at room temperature. This does not affect box calculations. Box specifications are suggestions other volumes and tunings can be used based on the needs of your application. The SA series woofers are compatible with most quality pre-fabricated enclosures as well. They also lend themselves favorably to fourth order band-pass enclosures. 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 "(2) SUNDOWN AUDIO SA-15 D4 REV. 3 SUBS 15 750W DUAL 4-OHM SUBWOOFERS SPEAKERS" is in sale since Monday, September 26, 2016.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.