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McIntosh MC303 User Manual

Page 8

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8

How to Connect for Center and Surround

Channels

the connection of a single Loudspeaker per amplifier

channel, with an impedance of 2 ohms, 4 ohms or 8

ohms.

Note: The remaining Amplifier Loudspeaker Terminals

should not be connected to another Loudspeaker.

6. Prepare the Loudspeaker Hookup Cables that attach to

the Amplifier by choosing one of the methods below:

Bare wire cable ends:

Carefully remove sufficient insulation from the cable

ends, refer to figures 1, 2 & 3. If the cable is strand-

ed, carefully twist

the strands together

as tightly as possible.

Note: If desired, the

twisted ends can

be tinned with solder to keep the strands together,

or attach spade lug and/or banana connector.

Spade lug or prepared wire connection:

Insert the spade lug connector or prepared section of

the cable end into the terminal side access hole, and

tighten the terminal

cap until the cable is

firmly clamped into

the terminal so the

wires cannot slip out. Refer to figures 4, 5 & 6.

Banana plug connection:

Insert the banana plug into the hole at the top of the

terminal. Refer to figures A and B.

Note: Banana

Plugs are

for use in

the United

States and

Canada

only.

7. Connect the Loudspeaker hookup cables from a single

Loudspeaker to the output terminals that match the

impedance of OUPUT 1, being careful to observe the

correct polarities. Output impedance connections of 2

ohms, 4 ohms and 8 ohms are provided. If the Loud-

speaker’s impedance is in-between the available con-

nections, use the nearest lower impedance connection.

Refer to “General Information” Note 5 on page 3 for

additional information.

WARNING: Loudspeaker terminals are hazardous live

and present a risk of electric shock.

8. In a similar manner, connect a Loudspeaker to OUT-

PUT 2 and connect the remaining Loudspeaker to

OUTPUT 3.

9. Connect the MC303 Power Cord to a live AC outlet.

Caution: The supplied AC Power Cord should not be

connected to the Rear Panel of the MC303

Amplifier until after the Loudspeaker Connec-

tions have been made. Failure to observe this

could result in Electric Shock. For additional

instruction on making Loudspeaker Connec-

tions contact your McIntosh Dealer or McIn-

tosh Technical Support.

The connection instructions below, together with the

MC303 Connection Diagram located on the separate folded

sheet “Mc1A, is an example of a typical audio/video sys-

tem. Your system may vary from this, however the actual

components would be connected in a similar manner. For

additional information refer to “Connector and Cable In-

formation” on page 4.

1. For Remote Power Control, connect a power control

cable from the A/V Control Center or Preamplifier

Power Control Out to the Right Front Channel Power

Amplifier Power Control In. Connect a second power

control cable from the Right Front Channel Power

Amplifier Power Power Control Out to the Left Front

Channel Power Amplifier Power Control In.

2. Connect a power control cable from the Left Front

Channel Power Amplifier Power Power Control Out to

the MC303 POWER CONTROL IN.

3. Connect cables from the Balanced Outputs of the A/V

Control Center or Preamplifier (Left and Right Front

Channels) to the Left and Right Front Power Ampli-

fiers.

Note: An optional hookup is to use the UNBALanced IN-

PUTS with unbalanced cables instead of balanced.

However, both type of connections for a given Input

should not be used at the same time.

4. Connect cables from the Balanced Outputs of the A/V

Control Center or Preamplifier (Center and Surround

Channels) to the MC303 BALANCED INPUTs (1-3).

When connecting Loudspeakers to the MC303 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:

5. This McIntosh MC303 Power Amplifier is designed for

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

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