User guide

Rear Panel Features
AC Power Inlet
The operating voltage is 230/240 VAC @ 50 Hz. The 3 pin IEC power inlet is located on the bottom left of
the rear panel and accepts a standard mains power lead fitted with an IEC connector. Before plugging in a
power lead, please check the rear panel of the amplifier to ensure that the voltage switch is set correctly for
your part of the world.
The inlet is equipped with an in-built AC fuse holder fitted with a 6.3 amp fuse plus a spare within the
holder. Power consumption is 400 VA.
Please ensure that the mains power cord is disconnected before attempting to check or
replace this fuse.
230V/240V Slide Switch
The operating voltage of the amplifier is user selectable between 230V and 240V via a slide switch located
on the right of the AC inlet. This switch should be set to match the AC voltage of your country
24 Volt DC Power Inlet
The AMIS250 features optional 24VDC power to run off a battery supply if required. This is connected via
the rear terminal strip. The front panel Power Switch will not switch DC power ‘on’ or ‘off’ in DC
operation. In this mode the amplifier is always ‘on’.
Speaker Output Terminal Strip
The screw terminals on the left hand side of the strip allow access to the direct speaker outputs of the
amplifier. The screw terminals on the right hand side are for activation of the in-built 4 tone generator.
Reading from left to right the terminals are:
Low Impedance Common (use with 4 ohms)
4 Ohms
Spare
Constant Voltage Common (use with 70v or 100v)
70 Volt Line
100 Volt Line
Spare
Tone Generator Common (use with one of the 4 tones listed below)
Pre-Announce Chime
Alert Tone
Bell Chime