dbx 30 User Guide
GRAPHIC
EQUALIZERS
30 SERIES
OPERATION MANUAL
®
CAUTION
dbx Professional Products
8760 South Sandy Parkway
Sandy, Utah 84070
Telephone (801) 568-7660
FAX (801) 568-7662
All trademarks are property of their respective companies.
This manual is part number 18-0521-A
© Copyright 1995 by dbx Professional Products
®
RISK OF ELECTRIC SHOCK
DO NOT OPEN
ATTENTION: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS
EQUIPMENT TO RAIN OR MOISTURE.
CAUTION: TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT REMOVE COVER
(OR BACK). NO USER SERVICABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE
PERSONNEL.
This symbol, where ever it appears, alerts
you to the presence of uninsulated dangerous
voltage inside the enclosure - voltage that
may be sufficient to constitute a risk of
shock.
This symbol, wherever it appears,
alerts you to important operating and
maintenance instructions in the
accompanying literature. Read the
manual.
A Harman International Company
MANUAL CONTENTS
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Q
UICK SET-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
I
NSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
W
ARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
O
PERATING CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
C
ONNECTING THE EQ TO THE SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . 6
R
EAR PANEL DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
I
NSTALLATION CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
O
PERATION AND APPLICATION NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . 12
T
ECHNICAL SUPPORT / FACTORY SERVICE . . . . . . . . . . . . . . . . . . . . . . 13
S
PECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
MANUAL CONTENTS
30 SERIES GRAPHIC EQs
INTRODUCTION
Congratulations for your purchase of a dbx equalization component. The dbx Graphic Equalizers are
high performance multifunctional units designed to deliver all the flexibility and power that professional
users demand. We recommend you take a moment to read through this Operation Manual. It provides
information that will assist you from system set-up to EQ applications. The 30 Series features include:
❍ 31 ISO standard center 1/3 octave constant Q frequency bands per channel (or 15 ISO standard
center 2/3 octave constant Q frequency bands per channel on model 3215)
❍ Low phase shift circuit design
❍ Variable high pass and switchable low pass 12dB/octave filters
❍ Electronically balanced inputs with superior common mode rejection
❍ Servo balanced outputs
❍ XLR, barrier strip, and TRS connectors
❍ -12dB/+15dB of input gain
❍ Chassis ground lift capability
❍ Toroidal power supply transformer
❍ Relay bypass on power-down
QUICK SET-UP
To get the equalizer up and running as quickly as possible, do the following:
❍ Unpack and inspect the equalizer and contents (pg. 3).
❍ Connect the equalizer to the system (pg. 6).
❍ Set levels and controls as needed (pg. 4).
For more detailed information about these steps, refer to the specified pages.
PROFESSIONAL PRODUCTS
INTRODUCTION, QUICK SET-UP
®
INSPECTION
Verify that the equalizer's package contains the following:
❍ Equalizer Unit (according to Model number marked on package)
❍ AC Power Cord
❍ Operation Manual
❍ Registration Card
❍ 4 Rack Mount Screws and Washers
If any of these items are missing, please contact dbx customer service at the number provided on the
inside cover.
WARRANTY
This warranty is valid only for the original purchaser and only in the United States. We warrant dbx products against defects in material or workmanship for a period of two years from the date of original purchase for use, and agree to repair or, at our option, replace any defective item, except external power
transformers, without charge for either parts or labor.
IMPORTANT: This warranty does not cover damage resulting from accident, misuse or abuse, lack of
reasonable care, the affixing of any attachment not provided with the product, loss of parts, or connecting
the product to any but the specified receptacles. This warranty is void unless service or repairs are performed by an authorized service center. No responsibility is assumed for any special, incidental or consequential damages. However, the limitation of any right or remedy shall not be effective where such is prohibited or restricted by law.
Simply take or ship your dbx product prepaid to our service department. Be sure to include your sales slip
as proof of purchase date. (We will not repair transit damage under the no-charge terms of this warranty.)
dbx will pay return shipping.
NOTE: No other warranty, written or oral is authorized for dbx products.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to
state. Some states do not allow the exclusion of limitations of incidental or consequential damages or limitations on how long an implied warranty lasts, so the above exclusion and limitations may not apply to
you.
INSPECTION, WARRANTY
30 SERIES GRAPHIC EQs
OPERATING CONTROLS
dbx 3031
dbx 3031C
dbx 3231L
dbx 3215
PROFESSIONAL PRODUCTS
OPERATING CONTROLS
®
IN
OUT
EQ
12 dB
-12
6 dB
RANGE
IN
OUT
HI CUT
IN
OUT
LO CUT
25
IN
OUT
EQ
12 dB
-12
6 dB
RANGE
IN
OUT
HI CUT
IN
OUT
LO CUT
25
IN
OUT
EQ
12 dB
-12
6 dB
RANGE
IN
OUT
HI CUT
IN
OUT
LO CUT
25
CHANNEL 1
CHANNEL 2
IN
OUT
EQ
12 dB
-12
6 dB
RANGE
IN
OUT
HI CUT
IN
OUT
LO CUT
25
0
dB
dB
GAIN
32
Hz
LO CUT
0
dB
dB
GAIN
32
Hz
LO CUT
dB
dB
GAIN
32
Hz
LO CUT
dB
dB
GAIN
32
Hz
LO CUT
3
6
+7-6
12
18
24
+15
30
36
63
42
125
Headroom (dB)
Power
200
3
6
+7-6
12
18
24
+15
30
36
63
42
125
Headroom (dB)
Power
200
3
6
0
12
+7-6
18
24
+15
30
36
63
42
125
Headroom (dB)
Power
200
0
3
6
+7-6
12
18
+15
24
30
63
36
125
42
Headroom (dB)
200
Power
+12
0
-12
20 25 31.5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1K 1.25K 1.6K 2K 2.5K 3.15K 4K 5K 6.3K 8K 10K 12.5K 16K 20K
0
-10
-20
20 25 31.5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1K 1.25K 1.6K 2K 2.5K 3.15K 4K 5K 6.3K 8K 10K 12.5K 16K 20K
+12
0
-12
20 25 31.5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1K 1.25K 1.6K 2K 2.5K 3.15K 4K 5K 6.3K 8K 10K 12.5K 16K 20K
20 25 31.5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1K 1.25K 1.6K 2K 2.5K 3.15K 4K 5K 6.3K 8K 10K 12.5K 16K 20K
+12
0
-12
+6
0
-6
0
-5
-10
+6
0
-6
+6
0
-6
3031
1/3 OCTAVE
GRAPHIC EQ
3031C
CUT ONLY
1/3 OCTAVE
GRAPHIC EQ
3231L
DUAL 1/3 OCTAVE
GRAPHIC EQ
RANGE
HI CUT
LO CUT
3
0
IN
OUT
EQ
12 dB
-12
dB
dB
6 dB
GAIN
IN
32
63
OUT
IN
OUT
25
Hz
LO CUT
+12
6
+7-6
12
18
24
+15
0
30
36
42
125
Power
200
-12
25 40 63 100 160 250 400CHANNEL 1 630 1k 1.6k 2.5k 4k 6.3k 10k 16k
+6
IN
OUT
EQ
12 dB
0
6 dB
RANGE
IN
OUT
HI CUT
IN
OUT
LO CUT
-6
3
0
-12
dB
dB
GAIN
32
63
25
Hz
LO CUT
+12
6
+7-6
12
18
24
+15
0
30
36
42
125
Headroom (dB)Headroom (dB)
Power
200
-12
25 40 63 100 160 250 400CHANNEL 2 630 1k 1.6k 2.5k 4k 6.3k 10k 16k
+6
0
3215
DUAL 2/3 OCTAVE
GRAPHIC EQ
-6
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