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 an 4 Amp slow blow fuse plus a spare
fuse.
Please ensure that the mains power cord is disconnected before attempting to check or
replace this fuse. Power consumption is 400 VA (max).
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 AMIS250P feature optional 24VDC power to run off a battery back-up 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
Located on the top left of the rear panel is the speaker output terminal strip. Reading from left to right, the
connections are:
COM Common or “-” for low impedance speaker loads (4 ohms).
4 The “+” for 4 ohm speaker loads (use with common)
COM Common or “-” for 70v or 100v speaker loads (maximum load of 40 ohms at 100v)
70 The “+” for 70v line speaker loads (use with common)
100 The “+” for 100v line speaker loads (use with common)
Please ensure that the correct “Common” is used. Low impedance and 70/100v loads can be used
simultaneously but please pay careful attention to the overall speaker load. When used individually, the low
impedance load should be 4 ohms or higher while the 100v line load should not fall below 40 ohms. When
both outputs are used simultanously, ensure that neither output is loaded to maximum.
Gain Control
Located to the left of the XLR input/output is a recessed screwdriver adjustable gain control. The gain
control is an input attenuation control normally used to match the amplifier to a wide variety of input
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