A custom enclosure is cool but a ready made In Phase XTB enclosure offers the ultimate in constructional integrity and suitability for each subwoofer driver or multiple subwoofer used. Designed to be a perfect acoustic match to each loudspeaker, they range from eight inches, via tens and twelves up to fifteen inches and with single, dual and even triple woofer enclosures, you can have bass from simple reinforcement, right up to competition grade muscle and all with outstanding musicality and deep lows you can feel as well as hear. The single driver designs even come in left and right hand orientations for better cosmetics when used in pairs within the same car boot. Only the best materials are used. Marine Treated Medium Density Fibreboard (MDF) up to a whopping 36mm thick for the front baffles and 18mm walls, all structurally braced internally for rigidity for maximum output. The leather paint finish is very tactile and the alloy ports look the business. In Phase bass enclosures; when you want awesome performance and you want it now.