Inputs:
2 mic, -50dB XLR balanced
1 mic/line -50dB / -10dB
Outputs:
Loop Monitor - 1/4" jack
Audio out - 1/4" jack
Loop: Screew terminals
Loop output: >9 Amps peek, 0.1 to 1.0 Ohms
Phantom Power 15V, 2mA

The ET150, 300 and 450 form the a series of audio frequency induction loop (AFILS) amplifiers and are designed to provide studio quality sound in an AFILS system. The amplifiers have 3 inputs on XLR; 2 dedicated microphones and one microphone or line selectable using a rear panel switch. User selectable Phantom Powering is available for the microphone inputs, enabled via a rear panel switch.

The inputs are individually mixed before passing to the compressor limiter, which prevents loop overload whilst compensating for varying microphone usage. All controls are recessed to prevent unauthorised access. Indication is provided for compression level, output current, loop status and power supply. A loop current monitor socket is provided to allow headphones to be used to monitor the actual loop current.

An audio output (post compressor) is provided for recording, with a slave audio in to allow cascading. A loop OK voltage is available to illuminate a sign showing correct loop operation. The units are all 1u (44.5mm) high and a 19" rack mounting kit is available.