dbx Pro 1215 User Manual

8760 S. Sandy Pkwy.

Sandy, Utah 84070

Phone [phone]

Fax [phone]

Int’l Fax [phone]

[e-mail]

http://www.dbxpro.com

A Harman International Company

®

O

The dbx 12 Series were designed to meet the needs of the most demanding sound reinforcement
environments, while offering the simplicity of straightforward controls. The 1215 provides standard
features like dual channels, 15 2/3 octave bands, ISO frequency centers, +/-12 dB input gain range, and
switchable 40Hz/18 dB per octave low-cut filters, but also includes other thoughtful features. These
include 45 mm faders; selectable +/-6dB or +/-15dB boost/cut range for precise gain adjustments; XLR,
barrier strip, and 1/4'' TRS connectors for installation ease; balanced inputs and outputs for quiet
operation; and chassis/signal ground lift capabilities for quick hum isolation. The visionary design of
the dbx 12 Series makes your job easier.

The dbx 12 Series Equalizers were precision engineered to provide years of maintenance-free operation
in any application. The magnetically isolated transformer, electronically balanced/unbalanced inputs
and servo balanced/unbalanced outputs, RF-filtered inputs and outputs, and power-off hard-wire relay
bypass with 2 second power up delay were steps our engineers took to ensure compatibility for all
installations. Only the best components were utilized, yielding a 10Hz to 50kHz frequency response,
greater than 90dB SNR (ref +4dBu), less than 0.005% THD +Noise (1kHz at +4dBu), and interchannel
crosstalk of less than -80dB from 20Hz to 20kHz. All this attention to detail is contained in a 2U
steel/aluminum chassis. It’s no wonder that dbx has been a leader in the industry for over 25 years.

2231

DUAL CHANNEL 31 BAND
EQUALIZER WITH
TYPE III™ NOISE REDUCTION

18-1778-A 07/99

• Switchable Boost/Cut range between ±6dB and ±15dB

• Electronically balanced/unbalanced inputs

• Servo balanced/unbalanced outputs

• RF filtered 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 hardwire relay bypass with 2-second power-up delay

1215

Graphic Equalizer

0

+15

25 40 63 100 160 250 400 16k10k6.3k4k630 1k 1.6k 2.5k

+6

+/-15

+18+100-10

0

OUTPUT

LEVEL (dBu)

CLIP

-15

0

-6

+/-6

RANGE

CUT

LOW

+12

dB

GAIN

INPUT

-12

EQ

BYPASS

0

+15

-15

25 40 63 100 160 250 400 16k10k6.3k4k630 1k 1.6k 2.5k

0

+6

+/-15

-6

+/-6

RANGE

CUT

+18+100-10

0

OUTPUT

LEVEL (dBu)

CLIP

LOW

+12

dB

GAIN

INPUT

-12

EQ

BYPASS

1215

The graphic equalizer shall be a dual 15-band type with frequency centers
on standard ISO two-thirds octave frequencies ranging from 25Hz to
16kHz. 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. Acircuit/chassis ground lift jumper per channel shall
be strapped across circuit ground and chassis ground screw terminals and
shall be removable by the user. Inputs shall be electronically
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 servo­balanced/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. Signal­to-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 2U (3.5") rack space. The unit shall be
a dbx 1215 Equalizer.

dbx engineers are constantly working to improve the quality of our products. Specifications are, therefore subject to change
without notice.

FOR MORE INFORMATION CONTACT:

dbx Professional Products

8760 S. Sandy Pkwy.

Sandy, Utah 84070

Phone [phone]

Fax [phone]

Int’l Fax [phone]

[e-mail]

http://www.dbxpro.com

A Harman International Company

586

Dual Vacuum Tube Preamp

TYPE IV™ Conversion System

704

Inputs

Connectors: 1/4" TRS, female XLR (pin 2

hot), and barrier terminal strip

Type: Electronically

balanced/unbalanced, RF
filtered

Impedance: Balanced 40kΩ, unbalanced

20kΩ

Max Input Level: >+21dBu balanced or

unbalanced

CMRR: >40dB, typically >55dB at

1kHz

Outputs

Connectors: 1/4" TRS, male XLR (pin 2

hot), and barrier terminal strip

Type: Impedance-

balanced/unbalanced, RF
filtered

Impedance: Balanced 200Ω, unbalanced

100Ω

Max Output Level: >+21dBu

balanced/unbalanced into
2kΩ or greater
>+18dBm
balanced/unbalanced (into
600Ω)

System Performance

Bandwidth: 20Hz to 20kHz, +0.5/-1dB
Frequency Response: <10Hz to >50kHz, +0.5/-3dB

+/-15dB range +/-6dB range

Dynamic Range: 109db 115db
Signal-to-Noise: 90db 97db
THD+Noise: <0.005%
Interchannel Crosstalk: <-80dB, 20Hz to 20kHz

Function Switches

EQ Bypass: Bypasses the graphic

equalizer section in the signal
path

Low Cut (recessed): Activates the 40Hz

18dB/octave Bessel high­pass filter

Range (recessed): Selects either +/- 6dB or +/-

15dB slider boost/cut range

Indicators

Output Level: 4-LED bar graph (Green,

Green, Yellow, Red) at -10, 0,

+10, and +18dBu
EQ Bypass: 1 LED: red
Clip: 1 LED: red
Low Cut: 1 LED: red
+/-6dB: 1 LED: yellow
+/-15dB: 1 LED: red

Power Supply

Operating Voltage: 100VAC 50/60Hz, 120VAC

60Hz, 230VAC 50/60Hz
Power Consumption: 1215 24W; 1231 24W
Mains Connection: IEC receptacle

Physical

Dimensions: 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)

Weight: 1215: 8.5 lbs.

1231: 10.6 lbs.
Shipping Weight: 1215: 9.5 lbs.

1231: 11.6 lbs.
Note: Specifications subject to change.

DUAL CHANNEL 15 BAND EQUALIZER

CHANNEL ONE

CLIP

EQ

BYPASS

POWER

24 WATTS

100V 50/60Hz

120V 60Hz

OUTPUT

LEVEL (dBu)

-120+12

dB

INPUT

GAIN

+18+100-10

LOW
CUT

25 40 63 100 160 250 400 16k10k6.3k4k630 1k 1.6k 2.5k

+6

+/-15

+/-6

0

RANGE

-6

CAUTION: TO REDUCE

THE RISK OF FIRE REPLACE
ONLY WITH SAME TYPE FUSE.

ATTENTION: UTILISER

UN FUSIBLE DE RECHANGE DE
MEME TYPE.

PROFESSIONAL PRODUCTS
A HARMAN INTERNATIONAL
COMPANY
MODEL 1215
GRAPHIC EQUALIZER

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

MANUFACTURED UNDER ONE OR MORE OF THE FOLLOWING
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

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CHANNEL TWO

+15

0

-15

CONNECTOR POLARITY

PHONE:

XLR:

TIP

PIN 1

RING

PIN 2

SLEEVE

PIN 3

+18+100-10

OUTPUT

LEVEL (dBu)

CLIP

-120+12

dB

LOW

EQ

INPUT

BYPASS

CUT

GAIN

OUTPUT INPUT

OUTPUT INPUT

25 40 63 100 160 250 400 16k10k6.3k4k630 1k 1.6k 2.5k

+6

+/-15

+/-6

0

RANGE

-6

®

+15

1215

0

Graphic Equalizer

-15

CHANNEL 1

OUTPUT

-

+

CHANNEL 2

OUTPUT

-

+

INPUTOUTPUT

INPUT

-

+

INPUTOUTPUT

INPUT

-

+