AUSTRALIAN MONITOR AMIS250 Series User manual

250W, 6 Channel Mixer Amplifier
AMIS250
Description
The AMIS250 is a 6 channel, 250 watt mixer amplifier suitable for rack or desk mounting. The ampli-
fier is a self contained compact unit of solid steel construction.
Inputs
The AMIS250 has six universal input channels with separate level controls. Each channel will accept
balanced or unbalanced microphone, line and auxiliary inputs. The unit has industry standard XLR
microphone sockets and dual RCA auxiliary sockets for each channel. An electronically-balanced
600 ohm telephone input for paging is also provided. An insert point is also featured on the rear
panel for those applications where an additional EQ or feedback exterminator may be required.
Outputs
The AMIS250 features 70 volt and 4 ohm isolated transformer outputs, plus a tape recorder output
by means of dual RCA sockets. A balanced 700mV XLR output is also provided to feed up to 6
power amplifiers.
3 Band EQ
The AMIS250 includes a 3 band equaliser (Bass, Middle and High), giving the user a wider range of
tone controls for high level music or difficult voice applications.
Tone Generator
The AMIS250 comes standard with an in-built four tone generator module. Tones include Bell, Pre-
announce Chime, Alert Tone and Evacuate Tone. Any of these tones may be activated from a sim-
ple contact closure on the rear panel of the amplifier.
Muting
VOX muting is standard on the AMIS250. A mic or line signal on channels 1 or 2 will mute channels
3, 4, 5 and 6. The muting function can be disabled via an internal link.
Phantom Power
Phantom Power (18V DC) is available from all mic inputs. A rear panel phantom power on/off switch
is also provided.
Protection
Internal current limiting protects the amplifier from both overload and overdrive conditions.
Australian Monitor Installation Series amplifiers feature a protection network that provides greater
stability and performance. Our amplifiers are recognised worldwide for their
reliability and this is due to the extensive levels of current limiting which pro-
tect the amplifiers from both overload and overdrive conditions.

Power Output 250 watts RMS
Maximum Load 20 Ohms @ 70 Volts
Power Bandwidth 60Hz - 17kHz (- 3dB)
Frequency Response 60Hz - 23kHz (- 3dB)
Total Harmonic Distortion 0.5% @ 1kHz rated power
Signal To Noise Ratio -74dB with all controls at their centre position
Tone Controls Bass @ 100Hz: Boost +12dB Cut -12dB; Mid @ 600Hz: Boost +12dB, Cut -12dB;
Treble @ 10kHz: Boost +9dB Cut -9dB
Inputs Six mic/aux universal inputs with XLR female mic sockets and dual RCA Phono aux sockets;
600 ohm transformer balanced telephone paging input
Input Sensitivity Mics: 1mV @ 200 Ohms; Aux: 150mV @ 47K Ohms
Outputs Speaker: 70 Volts, 4 Ohms; Tape: 350mV @ 10K Ohms; Line: Balanced 700mV
Phantom Power 18 Volts DC on all Mic inputs
Controls 6 Input channel gain controls, 1 Bass control, 1 Mid Control, 1 Treble control,
1 Master gain control, Phantom Power on/off switch (on rear panel)
Indicators Power ”on“ and ”Protect“ LED
Power Source 120VAC 60Hz 3 pin IEC connector; 24VDC
Power Consumption 400 Watts
Protection Current Limiter protection, plus AC and DC fuses
Dimensions/Weight 3.5" H x 19" W x 13" D (Chassis Dimensions only). 33.1lb
Rack Mounting Standard
Tone Generators Built-in four tone generator module.
Includes Bell, Pre-Announce, Alert and Evac Tones
Muting Built-in VOX muting. Channels 1 and 2 will mute channels 3, 4, 5 and 6
ARCHITECTURAL AND ENGINEERING SPECIFICATIONS
The mixer amplifier shall have six universal inputs each comprising of a balanced microphone with XLR
female sockets and an auxiliary input using dual RCA sockets. A balanced XLR output to drive additional
power amplifiers shall also be provided.
The amplifier master section shall include one master gain control, three EQ controls, one with 12dB of cut
and boost at 100Hz, one with 12dB cut and boost at 600Hz and the other with 9dB of cut and boost at
10kHz. Speaker outputs shall be transformer isolated at 70 volt and 4 ohms. The amplifier must be capable
of delivering 250 watts RMS into a 20 inductive ohm load, with less than 0.5% distortion measured at 1kHz
and with system hum and noise less than -74dB.
The amplifier shall be an Australian Monitor Installation Series model AMIS250.
UL APPROVED
PO Box 3126, Lynnwood, WA 98046 • Voice: 425-673-5175 • Fax: [phone]
• Website: www.australianmonitor.com • Email: [e-mail]
AUSTRALIAN MONITOR AUDIO INC.