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 Precision
Power
for further assistance.
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.
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.
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
Precision
Power
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 re/- 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 Precision
Power
amplifier, a Phantom Supply Module (PSM-100) must be used.
The PSM-100 su/- 15 volts to the PAR-224 and also adapts the DIN output
connector to standard RCA phono jacks.
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.
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.
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.
