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(11) IR Input
An IR repeater can be connected to this mini-jack.
(12) 12V Trigger
When this mini-jack is connected, the unit remains in power-off mode until 12 volts is supplied. Polarity is irrelevant.
(13) RS-232
Use this port to communicate with an RS-232 controlled touch panel system. See Appendix A for an explanation of the use of the
serial port, available commands, and their formats.
(14) Signal Sensing Auto On/Off Switch
With this switch in the “standby” position, your subwoofer can be safely left with the main power switched on continuously. The
subwoofer amp will turn itself on automatically when an audio signal is present. If no signal is present for approximately 10 minutes,
the unit will switch to standby mode. While in standby mode, your subwoofer amp will draw very minimal power. This function can
be disabled by leaving the switch in the “always on” position.
(15) Speaker Level Input Terminals
If you do not connect the IA-400D amplifier to your receiver using the line input/LFE input connection (Item 10, above), connect
these input terminals to the speaker output terminals of your amplifier or receiver. If you use this method of connection, when you
go to the receiver speaker set up menu, make sure you select the “large” speaker option. Also, select the option for no subwoofer.
This will make sure all bass and LFE information is fed to the speaker outputs and will be received by your IA-400D amplifier.
NOTE: Using both speaker terminals and the line level inputs is not recommended, as this may damage the IA-400D amplifier or
your receiver.
(16) Speaker Level Output Terminals
These connections send a crossed-over speaker-level signal to the front speakers. When connected in this fashion, your satellite
speakers will be crossed over at 80 Hz. This removes the lower bass frequencies from your satellites, enabling them to do a better
job reproducing high frequencies.
You may also connect your satellites directly to your receiver or amplifier along with the subwoofer if you wish to bypass this crossover.
An example of a speaker-level connection is shown in Figure 3.
InstallAdvantage IA-400D Amp manual
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