µ-Dimension ProX 840.4 COMP, Manual, Page: 8 / 12

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1. Signal Input RCA jacks
It allows left(”L”) and right (”R”) input channels to be connected to the amplifier using
RCA jacks.
Please use high performance audio cable
!
2. Input level control
The input sensitivity can be adjusted to the output voltage of your radio using the input
level control, The input level control does no adjust volumel Optimum setting of the
control gives you a sufficiently larger regulating zone for your car stereo combination
without any distortion or overloading.
The “LEVEL”control allows an adjustment from 5.0V to 150mV
To adjust the input sensitivity, turn the controls fully counter clockwise to minimum.
Adjust the car radio unit volume knob to maximum volume, and then turn the level
controls on the amplifier clockwise until audible distortion occurs. Now turn CCW for a
bit and the adjustment is done.
An incorrect level control adjustment not only has a negative effect on “sound
impression” but can also destroy your speakers!
4. Power indication and Protection circuitries (Indicator protection)
The green LED indicator on side panel provides a visual indication that the amplifier is
turned on.
The red LED indicator provides a visual indication that a problem exists and the
protection circuitry has protected the amplifier by shutting it down. Turn the system off
and correct the problem before turning the system back on.
Thermal protection: the amplifier will shut down if its temperature exceeds a safe
operating level. The amplifier will remain off until it cools to a safe operating
temperature. Exercise care, the exterior of the amp may get uncomfortably hot to
touch before shutting down.
Overload: the amp will shut down if electrical current demands exceed safe level
(can be caused by low impedances or by incorrect input level adjustment).
Short circuit: the Amplifier will shut down if a short circuit condition exists (can be
caused by poor insulation or by a damaged voice coil)
D.C. offset protection: the amplifier will shut down if an unsafe D.C offset condition on
the amplifier output exists, in order to avoid further damage to the speakers.
3. Crossover
Move the “XOVER” switch into “H” position to use this filter. The crossover frequency (HPF
FREQ) is variable from 50 Hz to 500 Hz or from 500 Hz to 5KHz by the “X1 / X10” switch
position and can be individually adjusted. Turn CW to set to a higher frequency, CCW to
set to a lower frequency.
Move the “CROSSOVER” switch into “LOW” position to use this filiter. The crossover
frequency (LPF FREQ) is variable from 50 Hz to 500 Hz OR FROM 500 Hz to 5 KHz by the
“X1 / X10” switch position and can be individually adjusted. Turn CW to set to a higher
frequency, CCW to set to a lower frequency.