McIntosh MA7900 Owner's Manual download pdf (Page 4)

on McIntosh Power Amplifiers. A 3.5mm stereo mini

phone plug is used for connection to the Power Con-

trol, Trigger and Passthru Outputs.

Data Port Connectors

The Data Out Ports send Remote Control Signals to

Source Components. A 3.5mm stereo

mini phone plug is used for connec-

tion.

IR IN Port Connectors

The IR IN Port also uses a 3.5mm stereo mini phone

plug and allows the connection of

other brand IR Receivers to the

MA7900.

RS232-C Data Port Cable

The RS232 Data Cable is a 3.5mm stereo mini phone

plug to a sub miniature DB 9 connector:

McIntosh Plug-In Jumper Connector

The MA7900 utilizes a phono style Plug-In Jumper to

connect the Preamplifier Output to the

Power Amplifier Input, one Jumper for

each channel.

Note: The Jumper Connector is available from the McIn-

tosh Parts Department:

McIntosh Jumper Connector Part No. 117781

XLR Connectors

Below is the Pin configuration for the XLR Balanced

Input Connectors on the MA7900. Refer to the dia-

gram for connection:

PIN 1: Shield/Ground

PIN 2: + Output

PIN 3: - Output

Power Control and Trigger Connectors

The Power Control Trigger Output Jacks send and

Passthru Input Jack receives Power

On/Off Signals (+12 volt/0 volt)

when connected to other McIntosh

Components. An additional connec-

tion is for controlling the illumina-

tion of the Power Output Meters

1. For additional connection information, refer to the

owner’s manual(s) for any component(s) connected

to the MA7900.

2. Apply AC Power to the MA7900 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 MA7900 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 MA7900 has activated, the Front Panel Power

Guard LEDs are illuminated continuously 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

MA7900. 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

14 thru 16.

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 MA7900.

7. The MA7900 Remote Control is capable of operat-

ing other components. For additional information

go to www.mcintoshlabs.com.

8. The IR Input, with a 1/8 inch mini phone jack, is

configured for non-McIntosh IR sensors such as

a Xantech Model HL85BK Kit. Use a Connection

Block such as a Xantech Model ZC21 when two

or more IR sensors need to be connected to the

MA7900. The signal from a connected External

IR Sensor will have priority over the signal from

the Front Panel IR Sensor.

9. 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.

10. For additional information on the

MA7900 and other McIntosh Products please visit

the McIntosh Web Site at www.mcintoshlabs.com.

Connector and Cable Information

Data

Signal

N/C

Data

Ground

General Information

Power

Control

Meter

Illumination

Control

Ground

Main, Trig 1&2

and Pass-Thru

PIN 1

PIN 2

PIN 3

IR Data

Control

Ground

N/C

General Information, Connector and Cable Information

PIN 1

PIN 6

PIN 5

PIN 9

Data In

(DB9-pin2)

Ground

(DB9-pin5)

Data Out

(DB9-pin3)

DB9

(male connector)

1 2 3 4 5 6 7 8 9 ... 35 36

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McIntosh MA7900 Owner's Manual Page 4

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