DBX 120XP User Manual

8760 S. Sandy Pkwy.

Sandy, Utah 84070

Phone (801) 568-7660

Fax (801) 568-7662

IntÕl Fax (219) 462-4596

customer@dbxpro.com

http://www.dbxpro.com

A Harman International Company

The disco boom of the 70Õs was fueled by the throbbing bass beat of dbx Subharmonic Synthesizers in discos around the world. During the 80Õs, patented dbx Subharmonic Synthesis was the secret weapon used by mobile DJÕs and film and sound professionals to produce an impact unavailable from any other deviceÑunique because the dbx process actually produces a new, Waveform Modeledª bass note, exactly an octave below the bass in the original audio.

The dbx 120XP Subharmonic Synthesizer has been specially optimized by dbx engineers for the needs of audio professionals. Its two separate bands of bass synthesis provide the best combination of smoothness and control, and the independent Low Frequency Boost circuit is designed to get the most out of high-performance low frequency speaker systems.

Flexible system interfacing is achieved by providing main outputs which can be full range (including synthesis) or high frequency only, along with a separate subwoofer output with its own level control.

The 120XPÕs patented subharmonic synthesis process actually builds the synthesized waveform using the waveshape of the original bass material. Unlike other attempts at bass synthesis, the dbx process produces smooth, musical low frequencies that don't interfere with mid and high-band information, even when maximum synthesis and boost are applied. The result is a low-end punch that people really feel, even at system levels that won't destroy sound equipment or damage hearing.

¥ Individual control for two ranges of subhar-

monic frequencies ¥ Separate Low Frequency Boost circuit ¥ Separate Subwoofer Output ¥ Balanced inputs and 1/4" jacks for all

connections ¥ Front panel LEDs that show crossover sta-

tus and synthesis activity ¥ Patented circuitry ensures that mid and high

frequencies are not affected ¥ Built-in crossover with choice of 80Hz or

120Hz crossover point

Enhance bass audio material for use in a variety of professional applications such as: ¥ Nightclub and dance mixing ¥ DJ mixing ¥ Theater and Film sound ¥ Music Recording ¥ Live Music Performance ¥ Broadcasting ¥ Aerobics

SYNTHESIZED FREQUENCYCROSSOVERBYPASSPOWER

MAX

MINMAX

MIN

36Hz-56Hz

26Hz-36Hz

SUBHARMONICS

LF BOOST

SUBWOOFER

The Subharmonic Synthesizer shall have a frequency response of 25Hz-20kHz ±0.5dB and 15Hz to 90kHz +0,

-3dB. The unit shall have 1/4" phone jack electronically balanced inputs with an impedance of not less than

18.5k½ and a maximum input level of not less than +20dBu for each of two channels. The unit shall have 1/4" phone jack outputs with an impedance of not more than 47½ and the maximum output level shall be not less than +20dBu into 600½. The unit shall have a single 1/4" phone jack output for signal to be sent to a subwoofer. The Subharmonic Synthesizer shall have a total harmonic distortion level (no synthesis) of 0.05% and an intermodulation distortion level (IHF or SMPTE, no synthesis) of 0.05%. The equivalent input noise shall be no more than -93dBu and the output noise (either output) shall be no more than -88dBu with controls set to maximum. The unit shall be equipped with the following front-panel controls: 26-36Hz and 36-56Hz Band Synthesis Level, Subharmonics, Low Frequency Select, Crossover in/out. The unit shall have Crossover, Synthesis, Power and Bypass indicators. The dynamic range shall be not less than 113dB and the synthesis frequency range shall be 26-56Hz (from 54-110Hz input signal). The crossover shall be 12dB/octave high pass (3dB @ 80Hz or 120Hz); 6dB/octave derived low pass, phase-coherent (unity-sum). The power requirement shall be 96-125VAC; 50/60Hz. The size of the unit shall be 1.75"x19"x6.2" (4.5cm x 48.3cm x 15.75cm) with a net weight of 4.75 lbs (2.2kg) and a shipping weight of 8 lbs (3.7kg.) The Subharmonic Synthesizer shall be a dbx 120XP.

120XP

Frequency Response:

(no synthesis, full-range mode) 25Hz-20kHz±0.5dB,

15Hz-90kHz +0, -3dB

Input Impedance: Balanced or Unbalanced ³18.5k½

Maximum Input Level: +20dBu

Output Impedance: 47½

Maximum Output Level: +20dBu into 600½

Connector Type: 1/4" TRS Phone Jack

THD: (no synthesis, either output) 0.05%

Intermodulation Distortion:

(no synthesis, either output) (IMD) IHF or SMPTE 0.05%

Equivalent Input Noise:

-93dBu, unweighted

Output noise:

(full range output) -88dBu, controls@max.

Front Panel Controls:

26-36Hz and 36-56Hz

Band Synthesis Level,

Subharmonics, Low

Frequency Boost,

Subwoofer Output

Rear Panel Controls:

Crossover Frequency

Select, Crossover in/out

Indicators: Power, Crossover,

Bypass

Metering: Synthesis activity (3

LEDs per band)

Dynamic Range: 113dB

Synthesis Frequency Range:

26-56Hz (from 54-

110Hz input signal)

Crossover:

12dB/octave high pass

(-3dB @ 80 Hz or

120Hz); 6dB/octave

derived low pass.

Phase-coherent (unity-

sum)

Power Requirements:

96-125VAC; 50/60Hz

DO Version,

180-250VAC; 50/60Hz

EU Version

Dimensions:

1.75"x19"x6.2"

(4.5cm x 48.3cm x

15.75cm)

Rack Space:

1 Rack Unit

Weight: Net/Shipping:

4.75 lbs/8 lbs

2.2kg/3.7kg

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