McIntosh MC275 Owner's Manual download pdf (Page 10)

Caution: Do not connect the AC Power Cord to the

MC275 Right Side Panel until after the Loud-

speaker Connections are made. Failure to

observe this could result in Electric Shock.

The connection instructions below, together with the

MC275 Connection Diagram located on the separate

folded sheet “Mc1A”, 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 7.

1. For Remote Power Control, connect a power control

cable from the Audio Preamplifier Power Control

Main Output Jack to the Power Amplifier POWER

CONTROL IN Jack.

2. Connect XLR cables from the Balanced Main

Output connector of the Audio Preamplifier to the

Power Amplifier BALanced INPUTS. Place the

INPUT Switch in the BALANCED Position.

Note: An optional hookup is to use unbalanced

cable and place the INPUT MODE Switch

in the UNBALanced Position.

This McIntosh MC275 Power Amplifier is designed

for Loudspeakers with an impedance of 4 ohms, 8

ohms or 16 ohms. Connect a single Loudspeaker only

to the Output Terminals.

When connecting Loudspeakers to the MC275 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

4 Ohms

12AWG 10AWG 8AWG

8 Ohms

14AWG 12AWG 10AWG

16 Ohms

16AWG 14AWG 12AWG

3. Prepare the Loudspeaker Hookup Cable for attach-

ment to the MC275 Power Amplifier:

Bare wire cable ends:

Carefully remove sufficient insulation from the

cable ends, refer to figures 1, 2 & 3. 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:

4. Attach the previously prepared

bare wire cable ends into the ba-

nana plugs and secure the connec-

tions. Refer to figure F.

5. Rotate the top of the Output Termi-

nal Post clockwise until it is nger

tight. Refer to gure G. 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.

6. Referring to figure H, connect

the Loudspeaker hookup cables

with banana plugs into the hole

at the top of the MC275 Nega-

tive (-) and Positive

Output (+) Termi-

nals. The Positive

Terminals are inden-

tified as 4Ω (ohms),

8Ω (ohms) or 16Ω

Figure 1

Figure 2 Figure 3

How to Connect for Stereo Operation

Output Terminals

When connecting the Loudspeaker Hookup Cables to

the MC275 Power Amplifier Output Terminals please

follow 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

Figure F

Figure H

Figure F

Figure H

Figure G

How to Connect for Stereo Operation

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McIntosh MC275 Owner's Manual Page 10

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