The ET150, 300 & 450 form the professional range 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.
At A Glance
Technical
Specification
Products & ordering information
Supplied By
Document number DET45700101
Inputs
Audio inputs 2 off microphone, 1 mic / line selectable
Type XLR
Phantom Selectable, 12V 5mA
Sensitivity -50dB Microphone -10dB Line
Mains Input
Voltage 230V ~ 50/60 Hz
ET150 ET300 ET450
Power 100VA Max 180VA Max 300VA Max
Internal fuse 2 off 3.15A(F) 2 off 5A(F) 2 off 6.3A(F)
Plug top Fuse 5A
Fuse for Spur 5A
Indication & Controls
LED indicators 4 off gain reduction, 5 off loop current, power,
loop integrity and protection operating.
User Controls 3x input mixer and current Drive.
Protection Recessed screwdriver adjust only.
Audio Processing
Compressor Variable ratio 1:1 to limit 20:1.
Attack 10mS
Release Automatic from 500mS to 1500mS
Dynamic Range >60dB
THD <0.25%
Output Stage
Type Current Mode
Loop impedance 0.1Ω to 1Ω
ET150 ET300 ET450
Peak Current >9A peak >12A peak >15A peak
125mS burst >6A peak >8A peak >10A peak
RMS Current 2A 3A 4A
(@1KHz)
Protection DC, Thermal, Short circuit, soft start.
Dimensions
Extents Height 44.5mm
Width 432mm (free standing) 485mm with Rack kit
Depth 165mm