dbx 12 Series, Operation Manual

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I
NTRODUCTION
Congratulations on your purchase of a dbx graphic equalizer. All dbx graphic equalizers are high performance
multi-functional units designed to deliver all the flexibility and power that professional users demand. We recom-
mend that 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 12 Series Equalizers include the following features:
• Switchable Boost/Cut range between ±6dB and ±15dB
• Balanced inputs and outputs
• XLR, Barrier Strip, and 1/4" TRS connectors
• -12dB/+12dB input gain range
• 18dB/octave 40Hz Bessel Low-Cut filter
• Chassis/signal ground lift capability
• Internal power supply transformer
• Power-off hard-wire relay bypass with 2-second power-up delay
I
NSPECTION
Verify that the equalizer’s package contains the following:
• Equalizer unit matching serial number marked on package
• AC power cord
• Operation Manual
• Registration Card
• Four rack mount screws and washers
If any of these items are missing please contact dbx customer service at the number provided on the back cover of
this manual.
O
PERATING
C
ONTROLS
Front Panels
1231 - dual channel 31 band graphic equalizer
1215 - dual channel 15 band graphic equalizer
2
®
OPERATION MANUAL
1231
Graphic Equalizer
20 25 31.5 40 50 63 80 500 400 315 250 1.6k 1.25k 1k 800 5k 4k 3.15k 2.5k 16k 12.5k 10k 8k 6.3k 20k 2k 630 100 125 160 200
RANGE
OUTPUT
LEVEL (dBu)
LOW
CUT
EQ
BYPASS
INPUT
GAIN
dB
-12
0
+12
+/-6
+/-15 CLIP
+18 +10 0 -10
RANGE
OUTPUT
LEVEL (dBu)
LOW
CUT
EQ
BYPASS
INPUT
GAIN
dB
-12
0
+12
+/-6
+/-15 CLIP
+18 +10 0 -10
0
-15
+15
0
-15
+15
0
-6
+6
0
-6
+6
RANGE
OUTPUT
LEVEL (dBu)
LOW
CUT
EQ
BYPASS
INPUT
GAIN
dB
-12
0
+12
+/-6
+/-15 CLIP
0
-6
+6
25 40 63 100 160 250 400 16k 10k 6.3k 4k 630 1k 1.6k 2.5k
+18 +10 0 -10
1215
Graphic Equalizer
0
-15
+15
RANGE
OUTPUT
LEVEL (dBu)
LOW
CUT
EQ
BYPASS
INPUT
GAIN
dB
-12
0
+12
+/-6
+/-15 CLIP
0
-6
+6
25 40 63 100 160 250 400 16k 10k 6.3k 4k 630 1k 1.6k 2.5k
+18 +10 0 -10
0
-15
+15