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10
ICM-16/MHI Installation and Operation Manual
INSTALLATION
INTERFACING TO THE STUDIOS
The first concern is how you will insert the MHI in the monitor path. Most consoles have
a control room monitor output, which will directly feed into the MHI monitor input ter-
minals. From the MHI monitor output terminals, you will feed your power amplifier.
You need to pay attention to the balanced and unbalanced connections on the MHI.
Next is the interfacing of your headphone system. The MHI has one built-in head-
phone amplifier. It is capable of powering any low impedance headphones (8-600
ohms). However, you may use the MHI headphone outputs to feed your own head-
phone amp. In this case, you will hook it up similar to the way you do the monitor
path.
The MHI is equipped with a selectable microphone/line talkback input. If your
microphone pre-amp (insert point) feeds a line level DA, you could take one output
and feed the Broadcast Tools® ICM-16/MHI. In this case, you would set-up the
ICM-16/MHI’s microphone/line talkback input for line level (“Mic/Line switch
SW24 IN”). Use R99 (line level) 15 turn pot to adjust the gain. For final adjust-
ments, use the “T/B SEND” pot. If your plan is to use a microphone with the unit,
release SW24 (OUT) for microphone level. Consumer level devices (-10dbv) may
be used for talkback sources by pressing SW24 in and removing R95 (2.2k).
One last connection is necessary in each of your studios. The MHI needs to know
when the microphone is on and the monitor speakers are muted. Regardless of the
output your console feeds to (i.e. the on-air light, air check machine, etc.), it needs
to go to the MHI. This can be any “WET” DC input between 3 and 28 volts or
(DRY) contact closure on J2. We also provide a 5 volt TTL/CMOS (active low)
input available on J3. This signal will tell the MHI to mute the monitor path (if
active), as well as to invoke the DND feature, if used.
Making Provisions for Bypassing the Broadcast Tools® ICM-16/MHI
Once you have figured out how your interconnects will be installed, you should
make provisions for keeping your monitor and headphone systems working in the
event you need to remove an MHI for calibration or repair. It is strongly suggested
that you clearly mark all cables that go in and out of the MHI so that patching around
it is possible.
Connecting Broadcast Tools® ICM-16/MHI to the Controller
The connection between each MHI and the Broadcast Tools®ICM-16/Controller
uses category 3 to 6 cabling. Plug one end of the cable into the RJ-45 on the MHI
and the other into the desired station number on the Broadcast Tools® ICM-16
Controller’s RJ-45 connector.
Where to Mount the Broadcast Tools® ICM-16/Controller
Try to find a location that is central to all of your studios so that you can keep your
cable runs as short as possible. We also recommend keeping the interface easily
accessible for troubleshooting. This unit can easily be mounted in any standard 19”
rack. We suggest keeping the cable between each workstation and the controller less
than 1000 feet.
