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OPERATORS MANUAL RA 27

REALTIME ANALYZER

QUICK START

If you are familiar with real time analyzers, feel free to jump right in. To avoid some of the lurking sharks read these

few tips as a reminder of what it is you already know:

FLAT IS NOT BEAUTIFUL. Equalizers have two basic purposes: correction and enhancement. The Rane analyzer

allows you to accurately correct system response to each location. A task very difficult to do by ear. Once this is quickly

done, then you adjust for further sound quality enhancement by ear; only rarely will a system be left in a “flat” condition.

USE MORE THAN ONE TEST MICROPHONE LOCATION. Speaker dispersion characteristics vary greatly, from

beamy highs to boomy bass traps. While performing the pink noise test, try at least two different test mic locations and

average the two if they differ.

USE ENOUGH PINK NOISE VOLUME TO OVERRIDE BACKGROUND NOISE. There’s no need to run

deafening pink noise levels to EQ a system. Just be sure that no green/red LED responds when pink noise is turned off (if

they do, background noise is causing erroneous readings and pink noise should be turned up higher).

USE ±3 dB DISPLAY SETTING FOR LOW FREQUENCY ADJUSTMENTS. The crest factor (peak response) of

true pink noise causes considerable LED flutter in the ±l dB mode, making it difficult to adjust quickly. We recommend

that the ±3 dB setting be used on frequencies below 500 Hz or so; use the ±l dB on the more sensitive mids and highs.

MONITORING PROGRAM WITH ANALYZER DISPLAY. When the front panel microphone is unplugged, the

analyzer display automatically monitors the RA 27 LINE INPUT signal. Use this feature to identify specific feedback

points by watching for red LEDs during the performance. You can then apply EQ exactly where it’s needed very quickly. If

all else fails, read the rest of the manual.

WEAR PARTS: This product contains no wear parts.

Summary of content (6 pages)

PAGE 1
OPERATORS MANUAL RA 27 REALTIME ANALYZER QUICK START If you are familiar with real time analyzers, feel free to jump right in. To avoid some of the lurking sharks read these few tips as a reminder of what it is you already know: FLAT IS NOT BEAUTIFUL. Equalizers have two basic purposes: correction and enhancement. The Rane analyzer allows you to accurately correct system response to each location. A task very difficult to do by ear.
PAGE 2
IMPORTANT SAFETY INSTRUCTIONS 1. Read these instructions. 2. Keep these instructions. 3. Heed all warnings. 4. Follow all instructions. 5. Do not use this apparatus near water. 6. Clean only with a dry cloth. 7. Do not block any ventilation openings. Install in accordance with manufacturer’s instructions. 8. Do not install near any heat sources such as radiators, registers, stoves, or other apparatus (including amplifiers) that produce heat. 9.
PAGE 3
FRONT PANEL DESCRIPTION POWER switch: You’ve probably figured this one out by now... Analyzer display LEDs: Each red LED lights up when response is too high in that band; green LEDs light when response is within ±3 dB or ±1 dB of the selected curve; yellow LEDs come on when response is too low. LEVEL control: Use this knob to adjust the microphone level (or line level when the microphone is unplugged) to properly drive the display.
PAGE 4
REAR PANEL DESCRIPTION LINE INPUT jack: This is an unbalanced ¼" Input to the analyzer. The range of acceptable signal levels is 15 mV-3.0 V AUX MIC INPUT jack: A female XLR type connector for inserting signals from a low impedance microphone into the RA 27. Use this jack when you wish to use a microphone other than the one supplied. PINK NOISE LEVEL adjust: Use a 1/8" screwdriver to adjust the output from the Pink Noise generator from 0 to 1.
PAGE 5
OPERATING INSTRUCTIONS Since the RA 27 features a unique form of realtime analyzer, we highly recommend that you read this section before performing an alignment with pink noise. If you’ve never used an analyzer before, use these instructions on your first occasion. You’ll be delighted at how simple it really is.
PAGE 6
MONITORING PROGRAM MATERIAL FOR FEEDBACK USING THE DISPLAY Once the pink noise test is completed, switch off the PINK NOISE on the RA 27 and unplug the Rane test mic from the front panel jack. When the mic is unplugged, the display is automatically switched to monitor the signal at the RA 27 LINE INPUT jack on the rear. Adjust the LEVEL control so that an occasional green LED blinks on during the performance peaks, but no red LEDs come on: you should be in the ±3 dB mode on the display.