Speaker Inputs: connect to head unit or amplifier speaker outputs. It receives the signal that your amplifier can’t handle.
Outputs: Connect to the amplifier inputs. The signal processed by the device is what just the amplifier wants.
REM In: Rem turn-on input. It works with the “REM” in the “Turn-on” mode.
REM Out: Connect to aftermarket audio equipment with “Rem In”. Rem-out will always remain active when the IOEM is turned on (regardless of the turn-on method). Connect it to only 1 aftermarket amplifier.
Load Select: 20-ohm/60-ohm/20k-ohm Many OEM head units require a resistance load to output audio signals, so an LOC without that load won’t work. 20-ohm or 60-ohm are compatible with most such systems. Select 20-ohm/60-ohm for those systems, and 20k-ohm for all the rest.
Ground Isolation: Try different switches when the “alternator whine “or “ground noise” creep into the audio path, as power ground and signal ground are not tied together. Turn off the converter when switching it.
GND: power supply has the same ground as the audio.
ISO: The power supply ground is separated from the audio.
200-ohm: There is 200-ohm load between the power ground and the audio ground.
Gain: It adjusts the output signal for every channel pair. 9.5V RMS.
Clip: The LEDs lights up then the output signal gets distorted.
LPF: It can be switched off or activated to filter signal above 250Hz. The 2 rear channels are mostly for subwoofers.
Boost: Adjusts bass from 0-12dB at 45Hz.
Turn-on Mode: It provides the drivers with the convenience to choose different ways to activate the device.
REM: It’s a traditional way of triggering the IOEM66/88 to work but provide you timely control when it will be turned on or off via ignition.
DC: The IOEM66/88 will be activated when the head unit is on, but please note the signal from the head unit should be a DC offset one.
AUD: When VOX is selected, the IOEM66/88 will only turn on when the head unit plays something, either radio, music from CD, or Bluetooth streaming.
Input Mode: When you want to get 6 or 8 outputs with the 4 speaker level inputs, switch it to 4CH. The 6 or 8 outputs will be fed with the same source, but you can still set LPF and or Boost for it.
REMOTE: IOEM88/66 provides optional remote level control for rear channels. It’s an attenuation control of the signal through the rear channels.