The BOSE's PANARAY MB4 is a 200W low-frequency loudspeaker that may be utilised for both permanent interior installations and portable applications. This passive speaker will work with amplifiers like the Bose 1600 or 1800, as well as others that are rated for 4 or 8 ohm loads. The output, bandwidth, and size of the MB4 speaker make it suitable for use as a standalone bass unit or as a modular building block to complement other Bose products in a professional system.