The Spectrum III is the optimum sound-field system with 100 watts of power for large rooms or rooms with high ambient sounds levels. Create a good intelligible learning environment over a large area with up to eight ceiling or wall speakers. The four auxiliary inputs provide multimedia integration with even distribution of sound for all audio in the classroom. RS-232 wall panel control of the line inputs, Fire alarm connection (AC or DC), remote Teacher Security Alert, teacher priority with instant attenuation of the line levels via Sapphire IRT-60 pendant and Digital Feedback Guard (DFG) and switchable computer anti-hum circuit on computer input. The Spectrum III is a four-channel receiver/amplifier with four auxiliary inputs, page pass through, and 4ea 25 watt amplifiers for 100 watts of power.