DESC: The NILES CM-8SW ceiling-mount dual voice coil subwoofer! Forget about hollow, tinny sound now you can fill rooms with beautiful music from speakers that are virtually unseen. The 8" mica-filled polypropylene driver provides the rich bass that you thought youd never get from an in-ceiling installation. The baffle-mounted high-pass and crossover controls mean flexibility. Use the CM8SW as a single stereo subwoofer with an 8-ohm load, or connect it with the voice coils in parallel and use it as as a mono subwoofer with a 4-ohm load.