16) Signal seems too loud and/or distorted when AU-1 or AU-2 program is
selected
a. The input signal level may not be properly matched to the
input sensitivity of the IMR-4. If your source is connected
using a line level output then try adjusting the volume from the
source equipment. The level should be set such that AUX
input has the same apparent loudness as the radio or CD
source in the Audio Center.
b. If connected to a loudspeaker or headphone output, be sure
that both input sensitivity switches are set to ON for the
desired channel. For Aux 1 channel set switches 3&4 to ON,
for Aux 2 set switches 5&6 to ON.
17) Signal is too quite when AU-1 or AU-2 program is selected
a. Be sure that input sensitivity switches are set to the OFF
position for the selected channel (AU-1 or AU-2)
b. Adjust the volume on your source equipment. Many devices
use a variable output and require that the volume be set nearly
to Maximum in order to achieve line level output. With most
TVs it is possible to defeat the internal loudspeaker
18) Hum or noise interference is audible when AU-1 or AU-2 program is
selected
a. Be sure that both Left and Right audio cables are properly
connected to your source. Leaving a cable unconnected will
allow interference to enter the cable
b. If connecting to a Mono source, you should use a ‘Y’ adapter
to send audio to both Left & Right channels of the IMR-4
c. Be sure that audio cable are routed away from vehicle main
wire bundles or other cables carrying large currents.
