don joewon song rs200 tune. KICKER - Solo-Baric L7S 15" Dual-Voice-Coil 2-Ohm Subwoofer - del: 44L7S152. SKU: 5772310. (13) Compare.. The bass reflex port should have at least 1/3 of the driver's diameter! Diameter of port(s) D p = cm ( You may change the port diameter ) Acoustic reflex thresholds generally are determined in response to stimuli of 500, 1000, 2000, Advice: -The subwoofer box can be extremely heavy and awkward to carry, get some helping hands if you need to. 2) Once the box has been moved install the speakers. I'd like to generate freq.s as low as 18hz, much lower if possible. So far my plan - based on another woofer (Pyle-Pro PDW21250) with a 1000.The Power Acoustik Subwoofer speaker has a dB efficiency of 83.6 and ispatible with various car stereo systems. This subwoofer makes an ideal addition to any music lover's car audio gear. RAZOR Series Subwoofer 1-Channel Amplifier Max Power 2,500 Watts RMS Power 2Ω 2,500 Watt Monoblock Amplifier.Subwoofer Box Skar Audio dual 18s for 2015 es Subwoofers | Slot (Front Panel) Net Internal Volume: 10.5 ft 3 . Port Area: 156 in 2 . Tuning Frequency: 32 Hz.