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6
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
(7.6m m)
XLR Connectors
Below is the Pin configuration for the XLR Balanced
Input Connectors on the MA252. Refer to the diagram
for connection:
PIN 1: Shield/Ground
PIN 2: + Output
PIN 3: - Output
Power Control Connector
The Power Control Output Jack sends Power On/
Off Signals (+12 volt/0 volt) when
another McIntosh Component is
connected. A 3.5mm stereo mini
phone plug is used for connection to
the Power Control Output.
Data Port Connector
The Data Out Ports send Remote Control Signals to
Source Components. A 3.5mm stereo
mini phone plug is used for connec-
tion.
1. For additional connection information, refer to the
owner’s manual(s) for any component(s) connected
to the MA252.
2. Apply AC Power to the MA252 and other McIntosh
Component(s) only after all the system components
are connected together. Failure to do so may cause
a malfunction of system operations as the Micro-
processor’s Circuitry inside the components is
active when AC Power is applied.
3. The MA252 includes an Auto Off Power Save
Feature and the default setting is enabled. For
additional information including how to disable it,
refer to page 22.
4. When Power Amplifier Protection Circuitry of the
MA252 has activated, the Vacuum Tubes LEDs are
illuminated continuously with the color orange and
the sound will be muted.
5. When the Power Transformer has overheated due
to improper ventilation and/or high ambient operat-
ing temperature, AC Power is removed from the
MA252. Normal operation will resume when the
operating temperature is in a safe range again.
6. 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 MA252.
7. The MA252 Remote Control is capable of operat-
ing other components. For additional information
go to www.mcintoshlabs.com.
8. When discarding the unit, comply with local rules
or regulations. Batteries should never be
thrown away or incinerated but disposed
of in accordance with the local regula-
tions concerning battery disposal.
9. For additional information on the MA252 and
other McIntosh Products please visit the McIntosh
Website at www.mcintoshlabs.com.
Connector and Cable Information
Data
Signal
N/C
Data
Ground
General Information
PIN 1
PIN 2
PIN 3
General Information, Connector and Cable Information
3/10 of an inch
(7.6millimeters)
Power
Control
Ground
N/C
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