User Guide

SYSTEM TUNING

31.5

40 50 63 80 100 125 160 200 250 315 400 500 630 800 1K 1.25K

1.6K

2K 2.5K 3.15K 4K 5K 6.3K 8K 10K 12.5K 16K 20K

THIRD OCTAVE REAL TIME SPECTRUM ANALYZER

PPI

RTA

NOTE:

If you are using the

PAR-245

as well as another equalizer

(like the

DEQ-230

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. Also, some RTAs have a built-in pink noise source. 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. Turn

on your system and start the pink noise. 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. Instead,

shoot for a curve that starts about 9 dB up at the low frequencies (25

Hz to about 100 Hz) dropping gently to 0 dB in the midrange (250

Hz to 3 kHz), then dropping gently to -9 dB at 16 kHz and 20 kHz.

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