9
IR IN Port Connector
The IR input allows an external IR receiver to
be attached to the MHT300. The input is labeled
IR IN. By attaching an IR receiver using a 3.5mm
cable, the remote control can be used in another
location without a line-of-sight to the MHT300’s
front IR sensor. The IR input
IR sensors such as a Xantech
Model DL85K Kit.
Note: The IR receiver must provide its
own power supply.
RS232
The RS232-C Data Cable is a 3.5mm stereo
mini plug used to connect to external third party
controllers.
Typical RS232 settings are:
• -8 data bits, no parity and
one stop bit
•
AC Power
This connection is essential. Plug the supplied
power cord into the AC connector located in the rear
right corner of the MHT300 and into a grounded and
functioning AC outlet.
Connector and Cable Information (continued)
IR Data
Control
Ground
N/C
MHT300 TXD Out
Data being transmitted
MHT300 RXD In
Data being received
Ground
Output Terminals
When connecting the loudspeaker hookup cables to
the steps below:
1. Rotate the top of the output terminal
Post counterclockwise until an opening
appears.
Opening
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.
3. Rotate the top of the output terminal
4. Place the supplied McIntosh wrench over the top
of the output terminal and rotate it one quarter
of a turn (90°) to secure the loudspeaker cable
connection. Do not over tighten. .
Connecting a Loudspeaker
The MHT300 is designed for loudspeakers with
an impedance of 4 or 8 ohms. Connect a single
loudspeaker only to one pair of the seven output
terminals. Take note of how the speaker channels
will be set up, as this will help facilitate any DIRAC/
EQ settings established later on. Please follow the
with jumpers connecting each channel to the pream-
equipment.
When connecting loudspeakers to the MHT300 it
is very important to use cables of adequate size so
there is little to no power loss in the cables. The size
smaller the gauge number, the larger the wire size.
Loudspeaker Cable Wire Gauge Guide
Loudspeaker
Impedance
Cable Distance
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
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