Precision Acoustics PA500D, Инструкция по эксплуатации

Страница: 5 / 24

INSTRUCTION MANUAL
PA602 | PA604 | PA500D
Amplifier Settings
Gain Calibration
The gain control (input sensitivity) on this amp is not a volume control. It is designed to provide proper match-
ing of various source units to this amplifier, and provides a reference to how much signal will be necessary to
reach maximum operating power. Correct settings will ensure safe operation for both your amplifier and
speakers.
• Start by turning the gain level to the “MAX” setting. This is the minimum level, far right.
•Next, turn up your head unit volume up to 75% of max volume. For example, if your digital volume control
goes to “50”, you would use the “40” level for this exercise.
•Last, slowly begin increasing the gain sensitivity ‘counter-clockwise until distortion becomes audible, and
then turn the gain back a notch. You have now properly set your input sensitivity.
Crossover Control
Your amplifier has been designed with an onboard crossover, or filter management system. How you configure
these settings will be dependent on the speakers you are connecting to the amplifier. The crossover circuit con-
sists of two main settings: 1. Filter Type; 2. Frequency Adjustment.
The “filter type” is controlled by a “LPF, FULL, HPF” switch. The low-pass filter, LPF, will allow only low fre-
quency information to pass on to the speakers. The opposite would be achieved using the HPF, high pass filter.
When no filter is required, the FULL setting would be selected, allowing all frequencies to pass.
For proper operation of some speakers, it is necessary to select the crossover point to which they will play. The
“frequency adjustment” setting allows you to accomplish this. In a LPF mode, only frequencies up to the
crossover point will play, with a gentle roll-off beyond that point. In HPF mode, any frequency above that point
will be heard, with those below being filtered away gradually.
Low Level Output
Rather than running a 2nd RCA for multiple amplifiers, the low level output offered on the PA602 will provide a
full-range signal to an additional amplifier. Simply run a shorter RCA from this amplifier to the next one in line,
such as your PA500D subwoofer amplifier. Fading capability will not be possible in this arrangement.
Subsonic Filter
Getting the most out of your amplifier is our goal. Having a subsonic filter in your subwoofer amplifier is going
to achieve just that. If you’re running a ported subwoofer system, it’s crucial that the output signal from your
amplifier doesn’t drop drastically below the tuning frequency. If that should happen, your subwoofer will feel as
if it’s in open air. The result, slow and permanent damage to the voice coil.
The subsonic filter found on our PA500D offers a continuously variable setting from of 10Hz to 50Hz. This will
ensure that sub-harmonics are dropped off quickly from your desired frequency. Proper setting of this filter will
help your subwoofer play cleaner, louder and with less distortion. Furthermore, your amplifier runs more effi-
ciently by not wasting voltage and current on reproducing unwanted or damaging frequencies.