The Bas X LCR is a two-way speaker featuring a ferrofluid cooled 1-inch silk dome tweeter a pair of matched long throw 4-inch mid/bass drivers with mineral filled polypropylene cones & rubber surrounds & dual rear-firing tuning ports. The Bas X LCR may be used vertically as a left or right main or surround speaker or horizontally as the center channel speaker in a surround sound system.