Cart Continue shopping “Polk Monitor XT12 12″ High Performance Powered Subwoofer – Black (Each)” has been added to your cart. Product Price Quantity Total × Polk Monitor XT12 12" High Performance Powered Subwoofer - Black (Each) $529.00 Polk Monitor XT12 12" High Performance Powered Subwoofer - Black (Each) quantity $529.00 Coupon: Proceed to checkout Available Coupons (click on a coupon to use it) Cart Subtotal $529.00 Note: Shipping and taxes are estimated and will be updated during checkout based on your billing and shipping information.