Furman Sound Stereo Equalizer RR 131 User Manual

®
GRAPHIC EQUALIZERS  
MODELS RR-215, RR-131, and RR-231  
an EQ adjustment of ±6 dB or ±12 dB, depending on the  
setting of the Range switch.  
FEATURES  
Three models:  
All models are built using compact 20 mm sliders,  
allowing a full set of 30 or 31 sliders to fit in only a single rack  
space. Though small, the sliders are of high quality and have  
a smooth, silky feel. They are center detented for quick,  
reliable identification of the zero setting.  
RR-215: Dual 15 Band Graphic Equalizer  
RR-131: Single 31 Band Graphic Equalizer  
RR-231: Dual 31 Band Graphic Equalizer  
20 mm sliders with center detents used throughout  
Output level matching controls with 0 to 10 dB range  
Bypass and Range buttons with LED indicators; Range  
buttons allow ±6 dB or ±12 dB slider adjustment  
Low Pass and High Pass buttons (RR-215) or sweepable  
controls (RR-131, RR-231)  
Because the exact EQ setting chosen may alter the  
program’s overall loudness, Level controls are provided.  
These are sliders which allow trimming the gain over a 10 dB  
range. An LED Clip light glows if the audio signal has  
exceeded the maximum output level (i.e., an overload  
condition exists), in which case the Level slider can be  
reduced to avoid distortion.  
Clip LEDs indicate overload conditions  
Unbalanced RCA, as well as balanced 1/4" TRS phone  
and XLR connectors, for all inputs and outputs  
Ground lift switches  
Pushbuttons are provided on each channel for Bypass,  
allowing an instant comparison of the sound with EQ in or  
out. A yellow LED glows when the EQ is bypassed.  
Dual voltage switch (100/120 or 200/240 VAC)  
All models feature extra control of extreme lows and  
highs. The RR-215 has High Pass buttons which cut lows  
below 40 Hz, and Low Pass buttons which cut highs above 16  
kHz. The RR-131 and RR-231 provide adjustable controls for  
High and Low Pass, allowing the cutoff frequencies to be set  
anywhere from 10 to 250 Hz, and 3 to 50 kHz, respectively.  
The High Pass function is particularly useful in avoiding  
power-gobbling rumble in systems not designed to reproduce  
extreme lows.  
DESCRIPTION  
RackRider's newest line of graphic equalizers have the  
features and performance you need for any sound  
reinforcement, room equalization, or recording application.  
The single-channel RR-131 and dual-channel RR-231  
divide the audio frequency spectrum into 31 bands, each  
spaced 1/3 of an octave apart, while the dual-channel  
RR-215 divides the spectrum into 15 bands, each spaced 2/3  
of an octave apart. The actual center frequencies chosen are  
those designated as standards by the ISO. Each slider allows  
For ease of hookup, any of three types of connections  
may be used for each input and output: XLR (balanced), 1/4"  
TRS phone (balanced or unbalanced), and RCA  
RackRider ® products are designed and imported exclusively by:  
Furman Sound, Inc. • 1997 South McDowell Blvd. • Petaluma, CA 94954, USA  
 

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