Precision Power Stereo Equalizer PAR224 User Manual

Connections  
Inputs - The PAR-224 has RCA phono jacks for inputs from two low level sources,such  
as a radio/tape unit and a CD player. A switch on the front panel selects the desired  
input. If only the radio input is used, this switch can then be used to mute the output  
when set to the CD position. The CD input can also be used to add an external signal-  
processing loop to the system. Connect the radio input to the preamp's radio input and  
also to the processors input (a "Y" connector is necessary) and then connect the  
processor's output to the PAR's CD input.  
Outputs - Two DIN-jack outputs - Front and Rear - are available on the back panel  
of the PAR-224. These ouputs connect directly to the DIN inputs of other  
PrecisionPower components such as an amplifier or crossover. A DIN to RCA  
adaptor is available for connections to other manufacturer's products.  
Power - The PAR-224 is Phantom powered, it receives +/- 15 volts from an external  
source - through either of it's DIN output connectors. Any PPI amplifier will automatically  
provide phantom power to the PAR-224 if it is connected to a DIN cable (a 15 ft. DIN  
cable is shipped with the PAR-224). Since the PAR-224 is powered by the amplifier, it  
will turn on and off simultaneously with the amplifier. If the PAR-224 is used in a system  
without a PrecisionPower amplifier, a Phantom Supply Module (PSM-100) must be used.  
The PSM-100 supplies +/- 15 volts to the PAR-224 and also adapts the DIN output  
connector to standard RCA phono jacks.  
PAR-224 EQUALIZER  
To take advantage of the PAR-224's unique capabilities, please read the  
following instructions before beginning. If you encounter difficulties during  
or after installation and are unable to resolve the problem, contact your  
dealer or call PrecisionPower for further assistance.  
Adjusting the Controls  
Volume - The PAR-224 volume control is a "master" level control for the system. The  
line output level and volume controls on the radio or other source unit will also affect  
system loudness. These controls should be set to a center position (1/2 to 3/4 of  
maximum) and the system volume adjusted with the PAR-224's control.  
Introduction  
The PAR-224 quasi-parametric equalizer - preamp is an auto stereo control  
center of unparalleled flexibility. It features 4 bands of equalization, dual  
inputs, front and rear outputs with fader, master volume and overload  
indicators. The center frequency of each equalization control can be set to  
one of sixteen different frequencies - allowing precise compensation for car  
acoustics. The choice of center frequencies, their spacing, and the selectivity  
("Q") of each of the bands can be optimized to solve the acoustic problems  
unique to your installation.  
Sub, Low, Mid, High - These equalization level controls operate in a conventional  
manner. They determine how much the frequencies in a selected band are boosted  
or cut (+/- 18 dB maximum). The 12 o'clock position produces no equalization (flat  
response).  
Frequency Selection - The center frequency of the individual equalization controls can  
be adjusted by proper positioning of the switches that are accessible through the bottom  
panel of the PAR-224. Each frequency has a "code" of switch settings as shown in the  
frequency selection table. The four switches allow up to sixteen distinct frequencies to  
be selected for each band of equalization.  
Mounting  
For under dash applications, a bracket is provided which allows adjustment of  
the preamp into the desired operating position. If the PAR-224 is to be  
mounted in a dashboard, console, or other panel, a 5" x 1 16/19" rectangular  
hole should be cut to clear the chassis. A minimum depth of 5 1/2" is required  
behind the panel to allow space for the connecting cables. The preamp installs  
from the front of the panel and is secured in place with four screws through the  
mounting holes in the front plate.  
Fader - The fader control on the rear panel balances the relative volume of the front and  
rear outputs. If only one output is used, the fader should be adjusted to the middle  
position. One output will be completely off if the fader is adjusted to either extreme.  
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Front of PAR is top of page  
Switch thrown to right  
Treble  
Mid-Range  
Freq. Q.  
16kHz 2.0  
Freq. Q.  
11.8kHz 2.7  
Freq. Q.  
9.6kHz 3.3  
Freq. Q.  
8.3kHz 2.0  
Freq. Q.  
4kHz 1.0  
Freq. Q.  
1.18Hz 4.1  
Freq. Q.  
1.08kHz 4.5  
Freq. Q.  
500Hz 1.7  
Freq. Q.  
7.4kHz 1.7  
Freq. Q.  
6.8Hz 2.3  
Freq. Q.  
7.8kHz 2.7  
Freq. Q.  
7.4kHz 1.7  
Freq. Q.  
750Hz 2.6  
Freq. Q.  
450Hz 1.9  
Freq. Q.  
680Hz 2.8  
Freq. Q.  
640Hz 1.5  
Freq. Q.  
10.8kHz 1.5  
Freq. Q.  
8.0kHz 2.0  
Freq. Q.  
9.6kHz 1.3  
Freq. Q.  
8.0kHz 2.0  
Freq. Q.  
1.5kHz 0.5  
Freq. Q.  
1kHz 1.0  
Freq. Q.  
1.34kHz 3.5  
Freq. Q.  
810Hz 0.83  
Freq. Q.  
11.3kHz 2.8  
Freq. Q.  
9.1kHz 2.0  
Freq. Q.  
12kHz 2.0  
Freq. Q.  
6.0kHz 2.0  
Freq. Q.  
2.17kHz 2.2  
Freq. Q.  
1.37Hz 1.4  
Freq. Q.  
2kHz 1.0  
Freq. Q.  
500Hz 1.0  
Mid-Bass  
Sub-Bass  
Freq. Q.  
240Hz 3.0  
Freq. Q.  
205Hz 3.5  
Freq. Q.  
188Hz 3.8  
Freq. Q.  
180Hz 3.0  
Freq. Q.  
90Hz 2.0  
Freq. Q.  
60Hz 3.6  
Freq. Q.  
54Hz 4.0  
Freq. Q.  
38Hz 2.3  
Freq. Q.  
190Hz 3.0  
Freq. Q.  
163Hz 3.3  
Freq. Q.  
175Hz 3.5  
Freq. Q.  
170Hz 2.9  
Freq. Q.  
46Hz 2.8  
Freq. Q.  
34Hz 2.5  
Freq. Q.  
42Hz 3.1  
Freq. Q.  
33Hz 2.0  
Freq. Q.  
195Hz 2.7  
Freq. Q.  
180Hz 3.0  
Freq. Q.  
185Hz 2.6  
Freq. Q.  
170Hz 2.9  
Freq. Q.  
53Hz 1.6  
Freq. Q.  
45Hz 2.0  
Freq. Q.  
48Hz 1.4  
Freq. Q.  
40Hz 1.8  
Freq. Q.  
205Hz 3.6  
Freq. Q.  
190Hz 3.2  
Freq. Q.  
210Hz 3.0  
Freq. Q.  
Freq. Q.  
Freq. Q.  
60Hz 2.0  
Freq. Q.  
65Hz 2.0  
Freq. Q.  
30Hz 2.0  
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150Hz 3.0  
70Hz 3.1  

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