English Contents Introduction; Inspection; Operating Controls - dbx 20 Series Operation Manual

OPERATION MANUAL
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 recommend 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 20 Series Equalizers include the following features:
• Revolutionary dbx TYPE III™ Noise Reduction capable of restoring up to 20dB S/N ratio
• Proprietary patent-pending PeakPlus™ Limiter for system protection
• Switchable 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 C
PERATING ONTROLS
2031 - single channel 31 band graphic equalizer
-10 0 +10 +18 10 6 3 1
+6
OUTPUT GAIN
LEVEL (dBu) REDUCTION (dB)
CLIP +/-15
0
+10 +15
+/-6 0
+5 +20
-12 +12 0 OFF
dB dBu
TYPE III EQ INPUT LOW PeakPlus RANGE
NR BYPASS GAIN CUT THRESHOLD
-6
2231 - dual channel 31 band graphic equalizer
-10 0 +10 +18 10 6 3 1
+6
OUTPUT GAIN
LEVEL (dBu) REDUCTION (dB)
CLIP +/-15
0
+10 +15
+/-6 0
+5 +20
-12 +12 0 OFF
dB dBu
TYPE III EQ INPUT LOW PeakPlus RANGE
NR BYPASS GAIN CUT THRESHOLD
-6
-10 0 +10 +18 10 6 3 1
+6
OUTPUT GAIN
LEVEL (dBu) REDUCTION (dB)
CLIP +/-15
0
+10 +15
+/-6
0
+5 +20
-12 +12
0 OFF
dB dBu
III
TYPE EQ INPUT LOW PeakPlus RANGE
NR BYPASS GAIN CUT THRESHOLD
-6
2
20 25 31.5 40 50 63 80 100 125 160 200
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
250 315 400 500 630 800 1k 1.25k 1.6k 2k 2.5k
Front Panels
3.15k 4k 5k 6.3k 8k 10k 12.5k 16k 20k
+15
0
Equalizer/Limiter
with TYPE
-15
+15
0
-15
3.15k 4k 5k 6.3k 8k 10k 12.5k 16k 20k
Equalizer/Limiter
+15 with TYPE
0
-15
2031
III NR
2231
III NR