background image

8

the insulation is removed from the cable 

end. The acceptable diameter of the copper 

stands size is 0.100 inches (2.54 mm) so it 

will fit the into opening on the MI128 Con-

nection Plug.

B. If desired, the twisted ends can be tinned 

with solder to keep the strands together.

3. Adjust the two top screws of 

the Loudspeaker Connection 

Plug to provide a sufficient 

opening size so the bare wire 

will fit into the connector. 

Refer to figure 2.

4. Insert the Loudspeaker 

Hookup Cable bare 

wire end into the 

Connection Plug 

opening. Refer to 

figure 3.

5. With the Hookup Ca-

ble insulation flush 

with the Loudspeak-

er Connection Plug 

opening, now rotate 

the two top screws to 

secure the Hookup 

Cable with the plug. 

Refer to figure 4.

6. Now complete the remaining Loudspeaker Con-

nection Plugs and the Loudspeaker Hookup Cables

WARNING: The MI128 Chassis Loudspeaker Con-

nection Socket Pins present a risk of 

electric shock when the Amplifier is 

On. For additional assistance on using 

Loudspeaker Connections Plugs con-

tact your McIntosh Dealer or McIntosh 

Technical Support.

.

When connecting the Loudspeaker Hookup Cables to 

the MI128 using the supplied Loudspeaker 

Connection Plugs. Refer to figure 1.

1. When connecting Loudspeakers to the 

MI128 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

14AWG

12AWG

10AWG

8 Ohms

16AWG

14AWG

12AWG

This McIntosh MI128 Power Amplifier is designed 

for Loudspeakers with an impedance of 4 ohms or 

8 ohms. Connect a single Loudspeaker only to each 

Channel Output Terminal.

2. Prepare the Loudspeaker Hookup Cable for attach-

ment to the MI128 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: A. If the Loudspeaker Cable used is greater 

in size than 12AWG, it can be used by 

removing some of the copper strands after 

How to Connect from a Multichannel Zone 

Preamplifier

Caution: Do not connect the AC Power Cord to the MI128 

Rear Panel until after the Loudspeaker Con-

nections are made. Failure to observe this could 

result in Electric Shock.

The connection instructions below, together with the 

MI128 Connection Diagram located on the separate 

folded sheet “

Mc1B

”, is an example of a typical Mul-

tichannel System. 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 Information” on page 3.

1. For Remote Power Control, connect a power control 

cable from the A/V Control Center Power Control 

Trigger/Output 2 to the Amplifier POWER CON-

TROL INPUT.

Note: When the Power Control Cable is connected 

between the MI128 and an A/V Control Center, 

the AUTO OFF Signal Sensing Circuitry is 

automatically disabled.

2. Optionally, connect the MI128 POWER CON-

TROL OUT using a power control cable to the first 

Loudspeaker and then connect the first Loud-

speaker Power Control Out to the Power Control In 

on the next Loudspeaker. Connect the remaining 

Loudspeakers in the same way.

3. Connect unbalanced cables from the A/V Control 

Center Analog Audio Out Zone 2 (Left and Right 

Channel) to the MI128 BUS 1 INPUTS, making 

sure to match up channel designations.

4. Connect unbalanced cables from the A/V Control 

Center Analog Audio Out Zone 3 (Left and Right 

Channel) to the MI128 BUS 2 INPUTS, making 

sure to match up channel designations.

Figure 2

Figure 3

Figure 4

0.100 inches

2.54 mm

0.5 inches

12.7 mm

Output Plug Connection

Figure 1

Cable Insulation

Loudspeaker

Connection

Plug

Figure 4

Cable Insulation

Cable Bare Wire

Loudspeaker

Connection

Plug

Figure 3

Figure 2

Openings

Screws

Содержание MI128

Страница 1: ...McIntosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 2699 Phone 607 723 3512 www mcintoshlabs com MI128 Eight Channel Power Amplifier Owner s Manual...

Страница 2: ...iliar with your McIntosh equipment and any other brands that may be part of your system If you or your Dealer wish additional help concerning a suspected problem you can receive technical assistance f...

Страница 3: ...ced Inputs There are eight Unbalanced Analog Audio Inputs for all eight Power Amplifier Channels Digital Audio Inputs The Digital Inputs decode PCM Signals from external sources The Optical Inputs pro...

Страница 4: ...sions Rear View of the MI128 Side View of the MI128 Front View of the MI128 17 1 2 44 5cm 3 15 32 8 8cm 4 5 16 11 0cm 13 1 4 33 7cm 18 1 2 47 0cm 17 1 16 43 3cm 25 64cm 2 0 5 0cm 13 19 32 34 7cm 1 5 1...

Страница 5: ...is installed together with other McIntosh Components check clearances on all components before proceeding Cutout Opening for Custom Mounting MI128 Front Panel Custom Cabinet Cutout Support Shelf Chass...

Страница 6: ...BUS 1 Unbalanced Input Jack L or R dependent by its Channel Type BUS 2 Unbalanced Input Jack L or R dependent by its Channel Type DIG 1 Coaxial or Optical Digital Input Connector DIG 2 Coaxial or Opti...

Страница 7: ...7 Audio Input s Signal Selection Connections for Loudspeakers 1 8 Channels 1 8 Power Amplifiers Channels Mode Switch 1 2 3 4 5 6 7 8 STEREO MONO Channels Input Switch 1 8 LINE BUS...

Страница 8: ...he MI128 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...

Страница 9: ...Plug insert the Plug End into the correct MI128 Rear Panel Chassis Loudspeaker Socket Then connect the opposite end of the Loudspeaker Hookup Cable to the Loudspeaker Connection Terminals Make sure t...

Страница 10: ...re 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 A If the Loud...

Страница 11: ...ched to the Loudspeaker Connection Plug insert the Plug End into the correct MI128 Rear Panel Chassis Loudspeaker Socket Then connect the opposite end of the Loudspeaker Hookup Cable to the Loudspeake...

Страница 12: ...LED indicates various Channel 3 Circuitry Functions LED indicates various Channel 2 Circuitry Functions LED indicates various Channel 1 Circuitry Functions LED indicates various Channel 5 Circuitry Fu...

Страница 13: ...r of the eight Power Amplifier Channels 1 2 3 4 5 6 and 7 8 have switches located on the MI128 Rear Panel for selection of the Input Source Signal and determine the Audio Signal Mode Refer to pages 6...

Страница 14: ...ak power output does not exceed twice the rated power output or less per channel with all channels operating for any combination of frequencies from 20Hz to 20 000Hz Wide Band Damping Factor Greater t...

Страница 15: ...e the original shipping carton and interior parts only if they are all in good serviceable condition If a shipping carton or any of the interior part s are needed please call or write Customer Service...

Страница 16: ...cts is the policy of McIntosh Laboratory Incorporated who reserve the right to improve design without notice Printed in the U S A McIntosh Laboratory Inc 2 Chambers Street Binghamton NY 13903 www mcin...

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