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General Information
1. For additional connection information, refer to the
owner's manual(s) for any component(s) connected
to the MHA150.
2. Apply AC Power to the MHA150 and other McIn-
tosh Component(s) only after all the system compo-
nents are connected together. Failure to do so may
cause a malfunction of system operations as the
Microprocessor's Circuitry inside the components
is active when AC Power is applied.
3. The MHA150 includes an Auto Off Power Save
Feature and the default setting is enabled. For
additional information including how to disable it,
refer to page 19.
4. When Power Amplifier Protection Circuitry of
the MHA150 has activated, the Front Panel Power
Guard LEDs are illuminated continuously and the
sound will be muted.
5. If the Power Transformer has overheated due to
improper ventilation and/or high ambient operat-
ing temperature, AC Power is removed from the
MHA150. Normal operation will resume when the
operating temperature is in a safe range again.
6. The Remote Control supplied with the MHA150 is
also capable of operating other McIntosh Compo-
nents. These other components may include Pre-
amplifiers, A/V Control Centers, Integrated Am-
plifiers, Source Components and Integrated Audio
Systems. There is a chance the MHA150 and one
of these other components may both respond to a
command issued by the MHA150 Remote Con-
trol or the Remote Control supplied with the other
component. This could affect operations such as
Volume Up/Down and Power On/Off. Many of
these other McIntosh components have the ability
to utilize what is known as "Alternate Codes" to
prevent them from responding to commands issued
4
by the MHA150 Remote Control. For additional
information refer to the Owner's Manual supplied
with the other McIntosh Component and look in
the "Setup Section - Remote Control Codes" of
the manual. In those rare instances where using
the "Alternate Codes" is not possible, the Remote
Control Sensor on the MHA150 can be switched
Off and the Front Panel Controls can be used for
operation instead of using the Remote Control.
Refer to page 20.
7. For the best performance and safety, it is important
to always match the impedance of the Loudspeaker
to the Power Amplifier connections. Refer to pages
10 and 11.
Note: The impedance of a Loudspeaker actually var-
ies as the Loudspeaker reproduces different
frequencies. As a result, the nominal impedance
rating of the Loudspeaker (usually measured at
a midrange frequency) might not always agree
with the impedance of the Loudspeaker at low
frequencies where the greatest amount of power
is required. Contact the Loudspeaker Manufac-
turer for additional information about the actual
impedance of the Loudspeaker before connecting
it to the McIntosh MHA150.
8. Sound Intensity is measured in units called Deci-
bels and "dB" is the abbreviation.
9. When discarding the unit, comply with
local rules or regulations. Batteries
should never be thrown away or inciner-
ated but disposed of in accordance with
the local regulations concerning battery disposal.
10. For additional information on the MHA150 and
other McIntosh Products please visit the McIntosh
Web Site at www.mcintoshlabs.com.
General Information, Connector and Cable Information
Connector and Cable Information
XLR Connectors
Below is the Pin configuration for the XLR Balanced
Input Connectors on the MHA150. Refer to the dia-
gram for connection:
PIN 1: Shield/Ground
PIN 2: + Input
PIN 3: - Input
Power Control Connectors
The Power Control Input Jack receives Power On/
Off Signals (+12 volt/0 volt) when connected to other
McIntosh Components. The Power
Control Output Jack sends Power
On/Off Signals (+12 volt/0 volt)
when connected to other McIntosh
Components. An additional con-
nection is for controlling the illumination of the Power
Output Meters on McIntosh Power Amplifiers. A
3.5mm stereo mini phone plug is used for connection
to the Power Control Jacks.
Output Terminal Connector
When cables with spade lugs are used
for Loudspeaker Connection, the spade
lugs need an opening of at least 3/10 inch
(7.6mm).
PIN 3
PIN 2
PIN 1
Power
Control
Meter
Illumination
Control
Ground
3/10 of an inch
(7.6millimeters)
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