JBL rmc User Manual

• Specialized Sound Level Meter

• Calibration CD

• User Guide

• Measurement Chart Paper (make additional 1-to-1 copies for future use)

• Width Template

• RMC Adjustment Tool

• RMC Remote Bypass Control

• 9 Volt Alkaline Battery

Using the calibration CD, warble tones spaced approximately on one-tenth octave centers
are played over the speaker systems, and the room response is measured and plotted
point-by-point on chart paper. The center frequency of a response peak is identified, and,
using the Width Template, the width of the peak is determined. The height of the peak in
dB is also measured. These three values are then entered into the RMC equalizer section
located on the rear electronics panel of the LSR6328P or LSR6312SP and, using a look-up
table in this manual, an inverse frequency response curve is introduced into the system.

The RMC Meter: Two views of the RMC sound level meter are shown in Figure 2. The
meter has a press and hold switch to incease battery longevity. Full-scale on the meter
corresponds approximately to a sound pressure level of 86 dB. The meter's scale covers a
range of 16 dB, the same as that of the chart paper you will use to record your measure-
ments. Here is a list of meter status indications:

• Power-On/Low Signal: This is indicated by the 

illumination of any LED on the bar graph. If 
the sound level in the listening space is below 
the measurement range of the meter, a green 
LED near the bottom of the bar graph will light.

• Overload: If the sound level in the listening 

space exceeds the range of the meter, 0 dB 
through -5 dB will all light simultaneously.

• Normal Measurements: When the sound level 

is within the range of the meter, the green LED 
will be off and one of the red LEDs on the bar 
graph will be illuminated, indicating the relative
sound level in decibels (dB).

• Low Battery: When the battery voltage is too 

low for accurate measurements, an LED at the 
bottom of the bar graph will be illuminated. At 
this point, replace the battery. (We recommend 
that you keep a spare battery on hand.)