User manual PRECISION POWER PAR 245

[. . . ] BACK TO CONTENTS FEATURES / SPECIFICATIONS 5 Band Parametric Equalizer Preamp Line Driver Choice of 16 Selectable Frequency/Q Settings for Each Band Front and Rear Outputs with Fader Control Dual Selectable Illumination Center-Detented Boost/Cut Controls ±15 dB Boost/Cut for Each Band Defeat Switch Gold-plated RCA Input and Output Connectors PWM (Pulse Width Modulated) Power Supply Independent L & R Input Gain Adjustments Input Clip Indicator Designed and Handcrafted in the U. S. A. Specifications Signal-to-Noise Ratio Total Harmonic Distortion (1 kHz, 1 VRMS) Boost/Cut Range Equalizer Center Frequencies and Q Values: Band Frequency Sub (30 - 66 Hz) Low (90 - 300 Hz) Low-Mid (430 - 900 Hz) High-Mid (950 Hz - 4. 6 kHz) Treble (6 - 16 kHz) Maximum Input Voltage (Flat) Maximum Output (10 k Load) Frequency Response Supply Voltage Dimensions 110 dB 0. 002% ±15 dB Q Value 2. 0 - 3. 0 3. 0 - 5. 5 2. 5 - 4. 5 2. 5 - 6. 0 1. 3 - 3. 3 10 VRMS 10 VRMS 3 to 100 kHz 9 - 15 VDC 4. 60" L 6. 75" W 0. 95" H 1 BACK TO CONTENTS MOUNTING Mounting To prevent damage to the PAR-245 while driving, mount it in a secure place. Choosing the appropriate location will depend upon your vehicle and the complexity of your system design. Typical mounting locations for your new PAR-245 would be in the dash or center console. [. . . ] Then adjust the control counterclockwise slightly until the LED doesn't light. This setting will minimize system background noise and prevents overloading the PAR-245. There are separate left and right gain adjustments for each input which allows left/right balance adjustments. Adjust gains to minimum sensitivity (fully counterclockwise on the gain control of a PPI amplifier. ) 2. Increase the gain on the amplifier until the onset of audible distortion. NOTE: In many multi-amplifier systems, the gain of some amplifiers may need to be further decreased to achieve tonal balance. 8 BACK TO CONTENTS SYSTEM TUNING Parametric Operation The PAR-245 Equalizer/Preamp puts an incredible amount of control at your fingertips. Correctly adjusted, it can solve many of the problems you will encounter along your road to perfect sound. By following these guidelines, you will avoid common pitfalls in system tuning and get your sound quickly dialed in. We recommend that you use a Real Time Analyzer (RTA) to speed things up, but it is possible to tune your system without it. It is important to understand what your equalizer actually controls to be able to use it effectively. On the face of the PAR-245 are five Boost/ Cut controls each corresponding to a range of frequencies. On the top are the five sets of Frequency/Q Selection switches to adjust for each Boost/Cut control on the front of the PAR-245 (See the chart on pages 14 and 15 for Frequency/Q selection. ) Q is an indication of how wide or narrow the adjusted bandwidth is. A low Q will affect a wide range of frequencies around the selected center frequency resulting in a gently curved shape, while a high Q affects a narrow band resulting in a peaked shape as shown below. 9 BACK TO CONTENTS SYSTEM TUNING NOTE: If you are using the PAR-245 as well as another equalizer (like the DEQ-230 or PMQ-210) Go to step 11. 1) The first step is to locate a suitable source of "pink noise. " A good choice would be the current IASCA competition reference disc. Ideally, the pink noise should play through your head unit, allowing you to compensate for any frequency response changes caused by it, or anything else, before the amplifiers. 2) Next, place the microphone from the RTA in the driver's seat at approximately head level. Initially, set the analyzer to read at 3dB per step, and set the speed of the RTA's readout to medium. Raise or lower the volume until you can see all (or most) of your frequency response on the RTA scale (a little above or below is OK). Make sure all of the equalizer's frequency controls are centered and look at the RTA screen. 3) You are trying to achieve a target frequency response, or "curve" that reflects your preference. You might think that a perfectly straight line would be best, but it really doesn't sound very good. If the sound isn't what you're looking for, go back to the pink noise and smoothly adjust your curve for more bass, less midrange or whatever you think will correct the sound. [. . . ] Some states or provinces do not allow the exclusion or limitation of incidental or consequential damages or limitations on how long an implied warranty lasts; so the above limitations or exclusions may not apply to you. Your product will be serviced on an in-warranty basis within the warranty period for the correction of warranted defects. If improper operation of your PrecisionPower product should occur, contact your Authorized Dealer for assistance with the return and factory repair of your PrecisionPower product. If an Authorized Dealer is not available, return the unit including your name, telephone number, return address, a copy of your sales receipt, and a description of the problem to: PrecisionPower, Inc. [. . . ]