dbx 1231 Features & Specifications - Page 2

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dbx 1231 Features & Specifications
1231
DUAL CHANNEL 31 BAND EQUALIZER
-10
0
+10
+18
10
6
OUTPUT
LEVEL (dBu)
CLIP
0
-12
+12
dB
EQ
INPUT
LOW
BYPASS
GAIN
CUT
-10
0
+10
+18
OUTPUT
LEVEL (dBu)
CLIP
0
-12
+12
dB
EQ
INPUT
LOW
BYPASS
GAIN
CUT
POWER
24 WATTS
100V
50/60Hz
120V
60Hz
The graphic equalizer shall be a dual 31-band type with frequency centers on standard ISO
one-third octave frequencies ranging from 20Hz to 20kHz. The boost/cut ranges shall be
switchable via recessed front panel switches to either +/-6dB or +/-15dB and the selected
range shall be indicated on the front panel by either of two LEDs per channel. Low-noise
equalization sliders having a 45mm travel shall be utilized having center detents at 0dB.
The equalizer shall have front panel 41-detent rotary input gain controls having a +/-12dB
range. Bypassing the equalizer sections of the signal path shall be accomplished via front-
panel switches having corresponding LEDs to indicate when each channel is bypassed. A
40Hz low-cut Bessel filter per channel with 18dB/octave slope shall be insertable in the
signal path via front panel recessed switches with an LED to indicate when the filter is
active. Output levels shall be monitored on four-LED peak-reading bar graphs calibrated to
read -10, 0, +10, and +18dBu.
Electronically balanced/unbalanced inputs shall include 1/4" TRS, female XLR, and screw
terminal barrier strip, while servo-balanced/unbalanced outputs shall include 1/4" TRS,
male XLR, and screw terminal barrier strip shared with the input. A circuit/chassis ground
lift jumper per channel shall be strapped across circuit ground and chassis ground screw
terminals and shall be removable by the user.
balanced/unbalanced and RF filtered having a nominal input impedance not less than 40kΩ
balanced and 20kΩ unbalanced, and shall accept maximum signal levels of not less than
+21dBu. Outputs shall be servo-balanced/unbalanced and RF filtered having a nominal
output impedance of not more than 200Ω balanced and 100Ω unbalanced, and shall be
capable of driving not less than +21dBu into 2kΩ or greater and not less than +20dBm (into
600Ω) continuously.
Frequency response shall be better than 10Hz to 50kHz, +0.5/-3dB. Signal-to-noise ratio
shall be greater than 90dB, referenced to +4dBu. THD+Noise shall be less than 0.005%
with a 1kHz signal at +4dBu, while interchannel crosstalk shall be lower than -80dB from
20Hz to 20kHz.
The internal power supply shall be constructed using a thermally-fused transformer
mounted in a low hum orientation and shall be magnetically isolated from equalizer
circuitry by means of a mu-metal shield. The power cord shall be detachable from an
international standard IEC 320 power inlet receptacle. Unit shall be constructed to meet or
exceed all applicable international safety and regulatory agencies. Domestic unit shall be
powered from 100VAC 50/60Hz, 120VAC 60Hz, while international unit shall be powered
from 230VAC 50/60Hz. Unit shall consume no more than 24W. Housing shall be of all
steel/aluminum construction and shall be rack-mountable in an IEC standard 19" rack and shall occupy a 3U (5.25") rack space. The unit shall be a dbx 1231
Equalizer.
dbx engineers are constantly working to improve the quality of our products. Specifications are, therefore subject to change without notice.
®
A Harman International Company
3
1
+6
+/-15
+/-6
0
RANGE
-6
20
25
31.5
40
50
63
80
100
+6
+/-15
+/-6
0
RANGE
-6
C A U T I O N :
T O R E D U C E
T H E R I S K O F F I R E R E P L A C E
R I S K O F E L E C T R I C S H O C K
O N LY W I T H S A M E T Y P E F U S E .
D O N O T O P E N
AT T E N T I O N :
U T I L I S E R
AT T E N T I O N :
R I S Q U E D E C H O C E L E C T R I Q U E - N E PA S O U V R I R
U N F U S I B L E D E R E C H A N G E D E
W A R N I N G :
T O R E D U C E T H E R I S K O F F I R E O R E L E C T R I C
M E M E T Y P E .
S H O C K D O N O T E X P O S E T H I S E Q U I P M E N T T O R A I N O R M O I S T U R E
PROFESSIONAL PRODUCTS
A HARMAN INTERNATIONAL
COMPANY
MODEL 1231
MANUFACTURED UNDER ONE OR MORE OF THE FOLLOWING
GRAPHIC EQUALIZER
U.S. PATENTS: 4,234,804 4,316,107 4,329,598 4,331,931 4,377,792
4,403,199 4,409,500 4,425,551 4,434,380 4,454,433 4,471,324
4,473,793 OTHER PATENTS PENDING
Inputs
Connectors:
Type:
Impedance:
Max Input Level:
CMRR:
1kHz
Outputs
Connectors:
Type:
Inputs shall be electronically
Impedance:
Max Output Level:
System Performance
Bandwidth:
Frequency Response:
Dynamic Range:
Signal-to-Noise:
THD+Noise:
125
160
200
250
315
400
500
630
800
1k
OUTPUT
OUTPUT
1/4" TRS, female XLR (pin 2
hot), and barrier terminal strip
Electronically
balanced/unbalanced, RF
filtered
Balanced 40kΩ, unbalanced
20kΩ
>+21dBu balanced or
unbalanced
>40dB, typically >55dB at
1/4" TRS, male XLR (pin 2
hot), and barrier terminal strip
Impedance-
balanced/unbalanced, RF
filtered
Balanced 200Ω, unbalanced
100Ω
>+21dBu balanced/unbalanced
into 2kΩ or greater
>+18dBm
balanced/unbalanced (into
600Ω)
20Hz to 20kHz, +0.5/-1dB
<10Hz to >50kHz, +0.5/-3dB
+/-15dB range +/-6dB range
109db
90db
<0.005%
1.25k
1.6k
2k
2.5k
3.15k
4k
5k
6.3k
8k
10k
586
Dual Vacuum Tub
OUTPUT
INPUT
OUTPUT
INPUT
+
-
-
+
CONNECTOR POLARITY
PHONE:
XLR:
TIP
PIN 1
RING
PIN 2
SLEEVE
PIN 3
OUTPUT
INPUT
OUTPUT
INPUT
+
-
-
+
Interchannel Crosstalk:
Function Switches
EQ Bypass:
Low Cut (recessed):
Range (recessed):
Indicators
Output Level:
EQ Bypass:
Clip:
Low Cut:
+/-6dB:
+/-15dB:
Power Supply
Operating Voltage:
Power Consumption:
Mains Connection:
Physical
Dimensions:
115db
Weight:
97db
Shipping Weight:
FOR MORE INFORMATION CONTACT:
dbx Professional Products
Phone (801) 568-7660
Int'l Fax (801) 568-7583
http://www.dbxpro.com
+15
0
-15
1231
12.5k
16k
20k
Graphic Equalizer
+15
0
-15
INPUT
INPUT
<-80dB, 20Hz to 20kHz
Bypasses the graphic equalizer
section in the signal path
Activates the 40Hz
18dB/octave Bessel high-pass
filter
Selects either +/- 6dB or +/-
15dB slider boost/cut range
4-LED bar graph (Green,
Green, Yellow, Red) at -10, 0,
+10, and +18dBu
1 LED: red
1 LED: red
1 LED: red
1 LED: yellow
1 LED: red
100VAC 50/60Hz, 120VAC
60Hz, 230VAC 50/60Hz
1215 24W; 1231 24W
IEC receptacle
1215: 3.5" H X 19" W X 7.9" D
(8.9cm x 48.3cm x 20.1cm)
1231: 5.25" H X 19" W X 7.9"
D (13.4cm x 48.3cm x 20.1cm)
1215: 8.5 lbs.
1231: 10.6 lbs.
1215: 9.5 lbs.
8760 S. Sandy Pkwy.
Sandy, Utah 84070
Fax (801) 568-7662