Output Terminals And How To Connect For Bi-Amp - McIntosh MC1.25KW Owner's Manual

Output Terminals
When connecting the Loudspeaker Hookup Cables to
the MC1.25KW 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 figures A and
B.
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
figure C.
3. Rotate the top of the Output
Terminal Post clockwise until it
is finger tight. Refer to figure 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 figure E.
How to Connect for Bi-Amp
Caution: Do not connect the AC Power Cord to the
MC1.25KW Rear Panel until after the Loud-
speaker Connections are made and the protec-
tive Terminal Connections Cover is installed.
Failure to observe this could result in Electric
Shock.
The connection instructions below, together with
the MC1.25KW Connection Diagram located on the
separate folded sheet "Mc1B", is an example of a typi-
cal audio system. Your system may vary from this,
however the actual components would be connected in
a similar manner. For additional information refer to
10
"Connector and Cable Information" on page 3.
1. For Remote Power Control, connect a power control
cable from the Audio Preamplifier or A/V Proces-
sor Power Control Output Trigger 1 to Amplifier
One POWER CONTROL IN.
Note: When the Power Control Cable is connected
2. Connect a second power control cable from Ampli-
Opening
fier One POWER CONTROL OUTput 1 to Ampli-
Figure B
Figure A
fier Two POWER CONTROL IN.
3. Connect XLR cables from the Balanced Output 1
(R, refer to note 2 below) of an Audio Preamplifier
or A/V Processor to Amplifier One BALANCED
INput. Place the INPUT MODE Switch in the
BALanced Position.
Notes: 1. An optional hookup is to use unbalanced
Figure C Figure D
Figure E
4. Connect XLR cables from Am-
plifier One Audio BALANCED
OUTput to Amplifier Two BAL-
ANCED INput.
5. Using a suitable tool remove the
two screws from each side of
the MC1.25KW Rear Chassis
Handle and temporarily place
them in a safe place. Refer to
figure 1.
This McIntosh MC1.25KW Quad Balanced Power
Amplifier is designed for Loudspeakers with an
between the MC1.25KW and Preamplifier or
A/V Processor, the AUTO OFF Power Save
Feature is automatically disabled.
cable and place the INPUT MODE Switch in
the UNBALanced Position.
2. When multiple MC1.25KWs are used in a
Stereo or Multichannel System, match up
the Preamplifier or A/V Processor Channel
Output designation to each MC1.25KW with
Loudspeaker and the Loudspeaker location
in the room.
Remove Screws
Figure 1
impedance of 2 ohms, 4 ohms or 8 ohms. Connect a
single Loudspeaker only to the Output Terminals.
When connecting Loudspeakers to the MC1.25KW
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
25 feet 50 feet
Loudspeaker
(7.62 meters) (15.24 meters)
Impedance
or less or less
2 Ohms 12AWG 10AWG
14AWG 12AWG
4 Ohms
16AWG 14AWG
8 Ohms
6. Prepare the Loudspeaker Hookup Cable for attach-
ment to the MC1.25KW Power Amplifier:
Bare wire cable ends:
Carefully remove sufficient insulation from the
cable ends, refer to figures 2, 3 & 4. If the cable
is stranded, careful-
ly twist the strands
together as tightly
as possible.
Figure 2
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:
7. Locate the Terminal Connections Cover from
inside MC1.25KW shipping carton. Insert the just
prepared Loudspeaker hookup cables thru the
cover opening on the right side. Refer to figure 5.
100 feet
(30.48 meters)
or less
8AWG
10AWG
12AWG
Figure 3 Figure 4