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.
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 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.
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.
