Rolls REQ131 Introduction, Installation, Front Panel, Rear Panel, Operation And Applications

INTRODUCTION

The ROLLS REQ series equalizers are intended for room equalizing or sound shaping and the approximate frequency response curve can be seen graphically by the settings of the frequency controls. Recording and broadcasting studios, sound contractors and musicians will appreciate the low noise, straightforward design, and versatile signal control of the REQ series.

INSTALLATION

Your REQ series equalizer may be installed in a standard 19î rack or placed in any dry, well ventilated area. The 1/4î connectors are balanced with the tip being positive (+) and the ring negative (-), or will assume an unbalanced state with unbalanced (TS) connectors. The XLR connectors are pin 2 positive (+). The chassis is lifted from the circuit ground (as are all ROLLS products) to help prevent ground loops. Since there are three types of input/output connectors, one type may be used on the input and another on the output. This helps to eliminate the need for special cables.

FRONT PANEL

The POWER switch is on when the red portion is showing. The VOL control provides the boost or cut settings for the input signal level. The LED bargraph shows the actual output level in dB so the use will know when the headroom is exhausted. EQ IN/OUT is for bypassing the equalizer circuits. The HPF and LPF controls are shelving filters , their 3dB down frequencies are indicated on the dials. For widest bandwidth, the HPF should be on 10Hz and the LPF should be set to 30 kHz. Frequency band slider controls cut or boost the indicated frequency by +/- 12 dB for the REQ131, or +/- 6 dB for the REQ215. When the slider is in the center or detented position, the frequency is left unmodified.

REAR PANEL

The rear panel contains the XLR, 1/4î, and RCA input and output jacks. Connect the power cable to a properly grounded AC outlet.

OPERATION AND APPLICATIONS

The REQ equalizers are useful signal processing tools where precise frequency control is needed across the audio spectrum. The frequency band centers are ISO standard, so it is compatible with most real time analyzers. When used with an analyzer, the REQ units may be used to tune an acoustical environment to avoid ringing (feedback), increase clarity, and flatten the overall frequency re- sponse. An analyzer is useful in determining the amount of equalization needed. Insert the graphic equalizer between the signal source and the power amplifier or crossover. Adjust the level and equalization as required to yield the desired system response. The HPF and LPF are used to band-limit the frequency re- sponse to increase clarity and reduce noise.

EXAMPLE

								LEFT .RET	OUT RIGHT	LEFT .RET	OUT
								2 AUX		1 AUX	2 AUX
1 MIC	2 MIC	3 MIC	4 MIC	5/6 MIC	7/8 MIC	9/10 MIC	11/12 MIC
+10	+10	+10	+10	+10	+10	+10	+10	.RET		RIGHT .RET	OUT
								RIGHT2 AUX	OUT LEFT	1 AUX	1 AUX
TRIM	TRIM	TRIM	TRIM	TRIM	TRIM	TRIM	TRIM
+60	+60	+60	+60	+60	+60	+60	+60

HPF

LPF

LEVEL

125

20K

20

25

31.5

40

50

63

80

100

160

200

250

315

400

500

630

800

1K

1.2K

1.6K

2K

2.5K

3.1K

4K

5K

6.3K

8K

10K

12.5K

16K

LINE

LINE

LINE

LINE

RIGHT

RIGHT

RIGHT

RIGHT

IN

OUT

50

100

4

6

0

+17

+12

TAPE

TAPE

30

200 2

10

+10

20

L

1.5

PWR

POWER PHANTOM

0

INSERT

INSERT

INSERT

INSERT

LEFT

LEFT

LEFT

LEFT

400

-7

+48V

16

HZ

500 1

KHZ

30 -12

+12

-12

R

EQ

-13

OFF

LEFT

RIGHT

BYPASS

L PAN R

L PAN R

L PAN R

L PAN R

L BAL R

L BAL R

L BAL R

L BAL R

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

0 AUX 2 10

12.5 k

12.5 k

12.5 k

12.5 k

12.5 k

12.5 k

12.5 k

12.5 k

RETURN

HIGH

HIGH

HIGH

HIGH

HIGH

HIGH

HIGH

HIGH

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

0

10

AUX 1

2.5 K

2.5 K

2.5 K

2.5 K

2.5 K

2.5 K

2.5 K

2.5 K

RETURN/

MID

MID

MID

MID

MID

MID

MID

MID

TAPE IN LEVEL

VOLUME 1

VOLUME 2

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

-15

+15

0

10

60

60

60

60

60

60

60

60

HEADPHONE LEVEL

HEADPHONE

LOW

LOW

LOW

LOW

LOW

LOW

LOW

LOW

OUTPUT

POWER AMPLIFIER RA200

+17

+8

0 AUX 2 10

0 AUX 2 10

0 AUX 2 10

0 AUX 2 10

0 AUX 2 10

0 AUX 2 10

0 AUX 2 10

0 AUX 2 10

0

-4

-13

0 AUX 1 10	0 AUX 1 10	0 AUX 1 10	0 AUX 1 10	0 AUX 1 10		0 AUX 1 10	0 AUX 1 10	0 AUX 1 10
+20	+20	+20	+20	+20	+20	+20	+20	+20
+14	+14	+14	+14	+14	+14	+14	+14	+14
+6	+6	+6	+6	+6	+6	+6	+6	+6
0	0	0	0	0	0	0	0	0
-10	-10	-10	-10	-10	-10	-10	-10	-10
-15	-15	-15	-15	-15	-15	-15	-15	-15
-20	-20	-20	-20	-20	-20	-20	-20	-20
-30	-30	-30	-30	-30	-30	-30	-30	-30
- ∞	- ∞	- ∞	- ∞	- ∞	- ∞	- ∞	- ∞	- ∞

1 2 3 4 5/6 7/8 9/10 11/12 LEFT RIGHT

SPECIFICATIONS
Frequency Response:	16 Hz to 30 kHz +/-3 dB
THD:	<.03%
S/N Ratio:	>90 dB
Max Input:	+21 dB (REQ131)
	+17 dB (REQ215)
Max Output:	+21 dB (REQ131)
	+17 dB (REQ215)
Input Impedance:	10KΩ (20K balanced)
Output Impedance:	50Ω
LED Levels:	+17, +10, 0, -7, and -13 dB
Frequency Centers:	31 ISO standard 1/3 octave +/-3%	(REQ131)
	15 ISO standard 2/3 octave +/-5%	(REQ215)
Shelving Slope:	12 dB / Octave (REQ131)
	6 dB / Octave (REQ215)
Size:	19" x 6" x 1.75"
	(48.3 x 15.2 x 4.5 cm)
Weight:	5 lbs. (2 kg)