3
Connector Information
Power Control Connector
The MI1250 Power Control Input receives an On/Off
signal from +5 to +12 volts. The Power Control Output
will in turn provide a +12 volt Output Signal with a
total current up to 50mA. An additional connection
is for controlling the illumi-
nation of the MI1250 Meter
Power Output Indicators. The
3.5mm stereo mini phone
plug connects to a McIntosh
Preamplifier or A/V Control
Center Power Control Output.
Introduction
Now you can take advantage of traditional McIntosh
standards of excellence in the MI1250 Power Ampli-
fier. The Twelve Channel Power Amplifier produces
high power output per channel and will drive quality
Loudspeakers to a high level of performance. The
MI1250 reproduction is sonically transparent and ab-
solutely accurate. The McIntosh Sound is “The Sound
of the Music Itself.”
Performance Features
• Power Output
The MI1250 consists of Twelve Power Amplifier
Channels, each capable of 50 watts into 8 ohm or 90
watts into 4 ohm Loudspeakers with distortion less
than 0.05%.
• Loudspeaker Guard
The McIntosh Loudspeaker Guard Circuit prevents
the amplifier from being overdriven into clipping,
with its harsh, distorted sound that can damage your
valuable Loudspeakers.
• Versatile Operation
The MI1250 provides power amplification for up to
twelve channels in a multi-Zone Audio System.
• Unbalanced Inputs
There are twelve Unbalanced Analog Audio Inputs
for all twelve Power Amplifier Channels.
• Digital Audio Inputs
The Digital Inputs decode PCM Signals from exter-
nal sources. The Optical Inputs process Digital Sig-
nals from 32kHz to 192kHz with 24-Bit resolution.
• Sentry Monitor and Thermal Protection
McIntosh Sentry Monitor power output stage protec-
tion circuits ensure the MI1250 will have a long and
trouble free operating life. Built-in Thermal Protec-
tion circuits guard against overheating.
• Power Control
The McIntosh Power Control Circuit allows for
remote turn-on of the MI1250 Power Amplifier from
a McIntosh A/V Control Center or Preamplifier for a
single or dual Zone System.
• Robust Power Supply
A well regulated power supply ensures stable low
noise performance.
• LED Solid State Front Panel Illumination
The even Illumination of the Front Panel is accom-
plished by extra long life Light Emitting Diodes
(LEDs). The Metal and Glass Front Panel ensures
the pristine beauty of the MI1250 will be retained
for many years.
Power
Control
Meter
Illumination
Control Ground
