Studiocraft A 400 power amplifier – 400W - Rackmount Designed for fixed installations such as shops, catering, office spaces or multiroom audio. The amplifier is fully rack-mountable, works stable and is built for continuous use. Supports 100V line and low impedance, ideal for ceiling and wall speakers. Condition: used, technically working perfectly Brand: Bose Model: AmPlus 100 Size: 19” rack Application: business music, multiroom, fixed audio installations Been connected and tested, works as it should.