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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.
OPERATORS MANUAL
RA 27
REALTIME ANALYZER
Manual-1
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Summary of Contents for Rane RA 27
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Page 1: Quick Start
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. -
Page 2: Important Safety Instructions
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV technician for help. CAUTION: Changes or modifications not expressly approved by Rane Corporation could void the user's authority to operate the equipment. This Class B digital apparatus complies with Canadian ICES-003. -
Page 3: Front Panel Description
MICROPHONE INPUT jack: PLUG ONLY THE RANE MICROPHONE INTO THIS JACK – THE DC VOLTAGE SUPPLIED BY THIS JACK COULD BE DAMAGING TO ANY OTHER MICROPHONE. When the mic is plugged in, the display responds to whatever the mic picks up;... -
Page 4: Rear Panel Description
PINK NOISE OUTPUT jack: This is an unbalanced ¼" jack which supplies Pink Noise to the sound system. RA 27 CONNECTION SYSTEM HOOK-UP Connect the RA 27 into your system as shown below. Plug the Rane condenser microphone into the front panel MIC INPUT. CAUTION: Do not plug any other microphone into the front panel jack: This jack contains DC voltage which may be damaging to other microphones. -
Page 5: Operating Instructions
Pink Noise, turn up the LEVEL control on the everywhere else). With all EQ sliders flat (centered) adjust RA 27 until some of the green and red LEDs respond on the the electronic crossover frequencies and level controls (if display: now you’re looking at background noise. - Page 6 Pink Noise Output suits your mixer. microphones with the RA 27. 3. An RA 27 can be used as a driver alignment tool (see the AC 22/23/B Owners Manual) as well as a room-flattening equalizer. Drivers are aligned when maximum level is shown at the crossover frequency on the RA 27 display.