The Teach Logic IMA-700 Spectrum II, Receiver/Amplifier/Mixer is a main unit that has two infrared receivers, three sensor inputs, four stereo auxiliary inputs, one dual line output, page over-ride with page pass through feature, nine band equalizer, front panel output for personal FM assistive listening system, four amplifier outputs and an external in-line power supply. The Spectrum amplifier can be rack-mounted or under-shelf mounted with appropriate mounting kit or free stance on a shelf.