STEP BY STEP PROCEDURE
5. ANALYZER SETTINGS:
Select either NORMAL or HOUSE CURVE on the RE 27 or RE 14 display.
Normal is generally used for large concert halls, large theatres and outdoor facilities. Use the HOUSE
CURVE for smaller concert halls, lounges, churches, etc. In this mode the analyzer is modified requiring
that all sliders between 400 Hz and 1.6 kHz must be attenuated -3 dB in order to obtain green LED
response (this is most easily seen in the ±l dB mode). This results in a warmer sound quality at lower
sound pressure levels, requiring less additional adjustment after the pink noise test.
NOTE: Wherever possible, try to correct for differences by re-aiming or re-locating speaker cabinets,
using EQ adjustments as a last resort
4. MICROPHONE PLACEMENT:
You should perform the pink noise test with at least TWO DIFFERENT
TEST MICROPHONE LOCATIONS for each separate channel of EQ. Since speaker dispersion
characteristics can vary greatly, it is desirable to look at a couple of different areas with the test mic to
obtain an average for the entire listening area If you are using one equalizer channel for both speakers
(mono), place the test mic in the center of the left half of the listening area and adjust for green LEDs with
pink noise through the left speaker. Now move the test mic to the center of the right half of the listening
area, run pink noise through the right speaker and observe the analyzer LEDs: use the RTA Level control to
center the response for as many green LEDs lit as possible. For each frequency that requires a different
adjustment than the left channel, note the original setting of the slider, then adjust it so that the green
LED above it is lit and then note this new slider position: the final setting should be half-way between
these two slider positions, resulting in an average response for the left and right channels. If you are
running stereo, use two mic locations for each channel, averaging in the same manner if there are
differences.
3. PINK NOISE RUN-UP:
Turn down the mixer output controls before switching on the pink noise, so
that you don’t detonate your speaker cabinets inadvertently. Now switch the pink noise button IN ON
THE RE 27/RE 14 and turn up the mixer and EQ Level controls slowly until you hear pink noise through
the speaker(s). There is a pink noise output level adjustment on the rear of the RE 27 and RE 14—use a 1/8"
screwdriver to increase or decrease the amount of pink noise to the mixer as necessary.
2. BACKGROUND NOISE CHECK:
Any background noises such as air conditioners, talking nearby traffic
and the like can cause false readings on the analyzer display if the pink noise volume through the
speakers is not loud enough to drown these noises out. Before turning on the pink noise, turn up the RTA
Level control on the RE 27 or RE 14 until some of the green and red LEDs respond on the display: now
you’re looking at background noise. Slowly turn the RTA Level control back counter-clockwise until all
the green and red LEDs are off, and no background noise is showing on the display. You will now have to
run the pink noise volume through the speakers loud enough to make sure that the RTA Level control is
not turned clockwise (up) from this setting otherwise the background noise will falsify the readings.
For special applications you can use another microphone by patching into a Send/Receive loop on a
mixer as described in Rane Note 104 (available on request).
CAUTION: DO NOT PLUG ANY OTHER MICROPHONE INTO THE FRONT PANEL JACK ON THE RE 27
or RE 14: THIS JACK CONTAINS DC POWER SUPPLY VOLTAGE FOR THE RANE CONDENSER
MICROPHONE WHICH MAY BE DAMAGING TO OTHER MICROPHONES.
1. SYSTEM HOOK-UP:
Connect the RE 27 or RE 14 into your system as shown in Diagrams III-1 through
111-4, whichever is appropriate. Plug the Rane condenser microphone into the front panel jack.
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