Vented bass powered subwoofer enclosures 15" premium heavy-duty woofer Power amp has forced air cooling for maximum reliability Internal line level low-pass/high-pass crossover network Fully adjustable Kosmos® C for increased bass impact Polarity switch for polarity reversal of subwoofer Full-coverage heavy-duty perforated steel grill Steel handles XLR/1/4" combo jack input Compact dimensions for a 15" woofer based sub Two high-pass XLR outputs, and one full-range thru XLR output Threaded pole mount with speaker pole included 800 watts peak available power Ground lift switch for lifting cable shield from ground