520 500 Series De-Esser


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The dbx 520 will help you expertly tame the excessive sibilance often found in vocals and other high frequency dense material. Based upon the legendary dbx 902, the dbx 520’s unique features make it possible to achieve an exact amount of de-essing regardless of variations in signal levels. The 520 allows you to create brilliant, crisp vocals without sibilance!

With its modular 500 Series based design, the dbx 520 examines the differences in dB between the high frequency and full-bandwidth portions of a signal, allowing de-essing of signals which change in level by as much as 60 dB. It features a Frequency Control with range from 800 Hz to 8 kHz, Gain Reduction Metering and a De-essing Amount Range from 0 dB to 20 dB.

Control vocals, drums, percussive instruments and problematic material/reverb combinations with the dbx 520!

• Based on the classic dbx 902
• Frequency Control Range from 800 Hz to 8 kHz
• Expanded Scale LED Gain Reduction Metering
• De-essing Amount Range from 0 dB to 20 dB
• In/Out Switch
• HF Mode Switch


Input Type Electronically balanced/unbalanced, RF filtered
Input Impedance 20 k O balanced, 10 k O unbalanced
Max. Input Level +22 dBu
CMRR >40 dB; typically >55 dB at 1 kHz
Output Type Electronically balanced/unbalanced, RF filtered
Output Impedance Balanced 30O, unbalanced 15O
Max. Output Level +22 dBu
Frequency Response 20 Hz – 20 kHz, + 0/-0.5 dB; 14 Hz – 120 kHz, +0/-3 dB
Noise <-99 dBu, Unweighted (22 Hz – 22 kHz)
THD+Noise <0.006% typical, No compression, 1 input kHz at 0 dBu
Dynamic Range >114 dB
GAIN Unity
Crossover Point Variable 800 Hz to 8 kHz
Crossover Filter Type 12 dB/octave, phase coherent
De-essing Range Operates uniformly over input range of -40 dBu to +22 dBu without requiring adjustment
Maximum Attenuation Variable 0 to 20 dB
Attack Rate Program-dependent, 2 ms for 10 dB above threshold, 600 µs for 20 dB above threshold, to achieve 63% gain reduction
Release Rate 925 dB/sec
Controls Frequency, Range
Switches IN/OUT, Mode (HF ONLY/NORMAL)
Indicators IN/OUT, HF ONLY
Metering LED Column: 1, 2, 3, 4, 6, 8, 10, 12, 15, 20 dB gain reduction
Power Requirements +/- 16V DC
Power Current Draw 76 mA per power rail
Power Draw 2.4 watts
Rack System Compatibility 500 Series Compatible Power-frame
Rack Space 1 Slot
Dimensions (H x W x D) 5.25” x 1.5” x 6” (13.34 cm x 3.81 cm x 15.24 cm)
Weight 1.3 lb. (0.59 kg)
Shipping Weight 1.7 lb. (0.77 kg)
More Information
Weight 2.000000
Length 10
Width 6.5
Height 4
Color Black
Manufacturer dbx by HARMAN
Manufacturer Model Number 520
Manufacturer Part Number DBX520
UPC 691991000652
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