McIntosh MA7900 Owner's Manual download pdf (Page 12)

Caution: Do not connect the AC Power Cord to the

MA7900 Rear Panel until after the Loudspeaker

Connections are made. Failure to observe this

could result in Electric Shock.

The connection instructions below, together with the

MA7900 Connection Diagram located on the separate

folded sheet “Mc2B”, is an example of a typical audio

system. Your system may vary from this, however the

actual components would be connected in a similar

manner. For additional information refer to “Connec-

tor and Cable Information” on page 4.

The McIntosh MA7900 Power Amplifier Circuitry

is designed for Loudspeakers with an impedance of

2 ohms, 4 ohms or 8 ohms. Connect a single Loud-

speaker only to the Right and Left Output Terminals.

When connecting Loudspeakers to the MA7900

it is very important to use cables of adequate size, so

there is little to no power loss in the cables. The size is

specified in Gauge Numbers or AWG (American Wire

Gauge). The smaller the Gauge number, the larger the

wire size:

Loudspeaker Cable Distance vs Wire Gauge Guide

Loudspeaker

Impedance

25 feet

(7.62 meters)

or less

50 feet

(15.24 meters)

or less

100 feet

(30.48 meters)

or less

2 Ohms

12AWG 10AWG 8AWG

4 Ohms

14AWG 12AWG 10AWG

8 Ohms

16AWG 14AWG 12AWG

1. Prepare the Loudspeaker Hookup Cable for attach-

ment to the MA7900 Power Amplifier:

Bare wire cable ends:

Carefully remove sufficient insulation from the

cable ends, refer to figures F, G & H. If the cable

is stranded, carefully twist the strands together

as tightly as possible.

Notes: 1. If desired, the twisted ends can be tinned

with solder to keep the strands together.

2. The prepared bare wire cable ends may be

inserted into spade lug connectors.

3. Banana plugs are for use in the United

States and Canada only.

Banana Plugs are for use in the United States and

Canada only:

2. Attach the previously prepared bare wire cable ends

into the banana plugs and secure

the connections. Refer to figure I.

3. Rotate the Output Terminal Post

clockwise until it is nger tight.

Refer to gure J. Then using the

McIntosh Wrench, rotate the top of

the Output Terminal one quarter of

a turn (90° ). Do not over tighten.

Refer to gure E.

4. Referring to figure K, connect the

Loudspeaker hookup cables with

banana plugs into the hole at the

top of the terminal to

the MA7900 Negative

Output Terminal and

Positive Output Termi-

nal indentified as 2Ω

(ohms), 4Ω (ohms) or

8Ω (ohms) connection

to match the impedance of the Loudspeaker, being

careful to observe the correct polarities.

Note: The illustration located on the separate

folded sheet “Mc2B” is for connection to an

8Ω (ohms) Loudspeaker.

If the Loudspeaker’s impedance is in-between

the available connections, use the nearest lower

impedance connection. Refer to “General Informa-

tion” Note 6 on page 4 for additional information.

WARNING: Loudspeaker terminals are hazard-

ous live and present a risk of electric

shock. For additional instruction on

making Loudspeaker Connections con-

tact your McIntosh Dealer or McIn-

tosh Technical Support.

Output Terminals

When connecting the Loudspeaker Hookup Cables to

the MA7900 Amplifier Output Terminals please fol-

low the steps below:

1. Rotate the top of the Output Terminal Post coun-

terclockwise until an opening

appears. Refer to gures A and

2. Insert the Loudspeaker hookup

cable into the Output Terminal

Post opening or the cable spade

lug around the center post of

the Output Terminal. Refer to

gure C.

3. Rotate the top of the Output

Terminal Post clockwise until it

is nger tight. Refer to gure D.

4. Place the supplied McIntosh

Wrench over the top of the Out-

put Terminal and rotate it one

quarter of a turn (90° ) to secure

the Loudspeaker Cable Connec-

tion. Do not over tighten. Refer

to gure E.

Figure A

Opening

Figure B

Figure C Figure D

Figure E

How to Connect Loudspeakers

Figure F

Figure G

Figure H

Figure I

Figure J

Figure K

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McIntosh MA7900 Owner's Manual Page 12

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