JL Audio 10TW1-4 TW1 Series Thin-Line 10" SubwooferCompact sub on a mission Advances in fabrication result in compact efficiency. JL Audio designed their TW1 subwoofers for tight spaces and tiny enclosures. Their 10TW1 4 10" subwoofer operates efficiently in an enclosure of only 0. 35 cubic feet and, at only 4 3 8" deep, this workhorse will fit in all kinds of tight spots you wouldn't expect a subwoofer to go. You can power this sub with up to 300 watts RMS, so it's perfect for medium sized systems.