McIntosh MC252 - Manual (Page 10)

10
Caution: The supplied AC Power Cord should not be
connected to the Rear Panel of the MC252
Amplifier until after the Loudspeaker Connections
have been made and the supplied protective
Terminal Connection Covers have been installed.
Failure to observe this could result in Electric
Shock.
There are two different ways of operating the MC252 mon-
aurally, Mono Bridged Mode and Mono Bi-Amp (Parallel)
Mode. The Mono Bridge Mode allows for Loudspeakers of
4S (ohm), 8S (ohm) or 16S (ohm) impedance to be con-
nected to the MC252. The Mono Bi-Amp (Parallel) Mode
allows for Loudspeakers of 1S (ohm), 2S (ohm) or 4S
(ohm) impedance to be connected to the MC252.
Choose the appropriate Mono Mode determined by the
impedance of your Loudspeakers. If the Mono Bi-Amp
(Parallel) Mode is appropriate for the Loudspeakers, pro-
ceed to page 12 for proper connections.
1. For Remote Power Control, connect a power control
cable from the Control Center or Preamplifier Power
Control Out to the MC252 Power Control In.
2. Connect cables from the Unbalanced Output of a McIn-
tosh Preamplifier or Control Center to the MC252
Unbalanced R/MONO Input.
Note: An optional hookup is to use balanced cables.
3. Prepare the Loudspeaker Hookup Cables that attach to
the MC252 Power 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 stranded,
carefully twist the strands
together as tightly as pos-
sible.
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. Tighten the top portion of the terminal post
and the set
screw to secure
the banana plug
in place. Refer
to figures 7 and
8.
Note: The use
of Banana Plugs is for use in the United States and
Canada only.
4. Referring to the “Mono Bridge Hookup Connections”
Chart on the next page, connect the Loudspeaker
hookup cables to appropriate output terminals based on
the impedance of the Loudspeaker (4S [ohm], 8S
[ohm] or 16S [ohm]), being careful to observe the cor-
rect polarities. If the Loudspeaker’s impedance is in-
between the available connections, use the nearest
lower impedance connection.
WARNING: Loudspeaker terminals are hazardous live
and present a risk of electric shock. For
additional instruction on making
Loudspeaker Connections contact your
McIntosh Dealer or McIntosh Technical
Support.
5. Attach the supplied Terminal Connection Covers with
the four Mounting Screws (6-32 x 1/4 inch Phillips
Head) to the Rear Panel of the MC252 Amplifier. Refer
to figure 9.
Note: The illustration in figure 9 is for the purpose of
installing the Terminal Connection Covers, showing
the opening on the covers for the Loudspeaker
Cables to exit the MC252. It is not intended to show
which terminal connections to use.
6. Connect the MC252 power cord to an active AC outlet.
How to Connect in Mono Bridged Mode
Terminal Connection Covers
Cover Mounting
Screw Locations
Cable Openings
Figure 9
Cover Mounting
Screw Location