A terrific subwoofer run with Nautilus 800D. I decided to built two 13 cubic foot 18" JBL 2245H based subwoofers so the B&W is for sale now. Actually, having heard the JBLs one of the JBLs is for sale too as one is more than enough. I am in Minneapolis where you can audition and pick up. The sub is very heavy. It will need to be shipped freight. I will box and palletize it. You pay for freight and insurance. I can see that these have sold recently for $1500.