Adjusting Crossover Input Gains:
1. Adjust all crossover gain controls to 0 dB, 1/2 of maximum sensitivity.
2. Adjust all amplifier gains to 1/2 of maximum sensitivity.
3. Turn the volume knob on the equalizer to a maximum of 3 o'clock.
4. Increase the gain of the crossover until the onset of audible distortion. Then
decrease the gain prior to the immediate point of audible distortion. This setting
will minimize system background noise and prevents overloading of the
crossover.
5. Repeat step 4 for any remaining crossovers in the system.
6. Adjust the input gains next.
NOTE:
In many multi-crossover / accessory systems, the gain of some crossover and
accessories may need to be further decreased to achieve proportional balance.
Adjusting the Amplifier's input Gain:
Adjust the amplifier's input gain to 1/2 maximum sensitivity. Turn the volume knob on the
equalizer to a maximum of 3 o'clock. Increase the gain (clockwise) until the onset of audible
distortion. Then decrease the gain counterclockwise prior to the immediate point of audible
distortion. This setting will minimize system background noise and prevents overloading of the
amplifier. Repeat step 3 for any remaining amplifiers in the system.
NOTE:
Depending on the sensitivity of the systems preamp(s), the gain of the
amplifier(s) may not need adjustments. Also, in many multi-amplifier systems, the gain of
some amplifiers may need to be further decreased to achieve proportional balance.
TROUBLESHOOTING
If for some reason your system fails to operate properly, please refer to this guide. If you are
unable to resolve the problem, consult your Authorized
PPI
Dealer or call
1-800-62-POWER.
NO SOUND
Is the power LED illuminated?
Check fuses in power wire.
Be sure turn-on lead is connected.
NO SOUND IN ONE CHANNEL
AMP TURNING OFF
Check speaker leads and inspect for a short to ground or
an open connection.
Check pre-amp leads. Reverse left and right leads to see
if the problem is before the amplifier.
Check Mono Bridge and Bi-Amp crossover switches on
other units prior to the amp.
If the problem is in the amp, have your Dealer inspect
the unit.
Is the amp able to cool properly?
Check speakers for shorts or damage.
Make sure power and ground are secure.
Have
PPI
Dealer inspect amp.
Switching is controlled via a 6 position dip switch (located through the bottom panel of
the amplifier). Five of the six control switches adjust the different functions of the
crossover (refer to Figure D. above). The function of each is denoted by its relative 'on /
off' position
It is important to note that the low-pass outputs (RCA-jacks) are always available, and
the front inputs are their signal source. The position of switch 2 & 3 will determine the
frequency available at this output.
Outputs (Ax400 only)
The Ax400's front inputs supply the signal source for a set of RCA low-pass outputs. The
frequency of this output signal is determined by the integrated crossover. Switch 2 & 3 of
the 6 position dip switch adjusts the low-pass output frequency - 70 Hz, 110 Hz, 260 Hz,
and 300 Hz.
System Tuning
In order to achieve maximum signal -to-noise performance from a high quality mobile
sound system, it is desirable to use high signal levels wherever possible in the
interconnection cables. High signal levels will reduce the effect of induced noise. The
peak level of an audio signal is usually determined by the clipping level of electronic
components. The following procedure should be used as a guide when the system
installation is complete.
Содержание A204
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