dbx 4820 User Manual

A Harman International Company

®

Designed to provide incredible flexibility, sonic excellence and intuitive control for performance
applications, the DriveRack 4820 is the next member of the hugely successful of the hugely successful
DriveRack family. From the powerful 96 kHz DSP engine and standard analog and digital I/O, to the
tamper-proof front panel, the 4820 provides all the processing, flexibility and control necessary for
permanent installations.

The DriveRack 4820 is the next generation of the famous DriveRack family, and like its predecessor
it is engineered to provide “Everything you need between the mixer and the power amps”. In keep­ing with this philosophy the 4820 includes four inputs and eight outputs with both analog and dig­ital connectivity; a CobraNet option rounds it out offering greater flexibility for large installations.
The 96 kHz processing engine is capable of offering insert processing functions to customize the pro­cessing path for your application, in addition to the standard system processing functions all with
extremely low latency and extended frequency response. From Signal Routing, EQ, and Bandpass
Filters, to classic dbx®Dynamics and Feedback Suppression all the processing is available and with
the sonic excellence that you would expect from the world's leading system processing manufacturer.
With all this processing power available, control is of paramount importance. The DriveRack 4820
provides a tamper-proof front panel, and is controlled by an easy-to-use GUI with optional wall panel
controllers; so whether you application is Front of House system processing or Distributed system
control, the DriveRack 4820 has what it takes. For more information please visit www.driverack.com
or www.dbxpro.com.

• 48 and 96 kHz operation

• 4 analog and AES/EBU inputs

• 8 analog and AES/EBU outputs

• Full Bandpass Filter, Crossover and
Routing Configurations with Bessel,
Butterworth, and Linkwitz-Riley filters

• 31-Band Graphic and 9-band
Parametric EQ on every input

• 6-band Parametric EQ on every output

• Loudspeaker Cluster and Driver
Alignment Delays

• Selectable DSP inserts on all inputs
and outputs including Classic dbx
Compression, Limiting and Advanced
Feedback Suppression among others

• Ethernet networking control

• Optional dbx ZC wall panel control

• Optional CobraNet I/O

®

• Optional Jensen

I/O Transformers

8760 S. Sandy Pkwy.

Sandy, Utah 84070

Phone [phone]

Fax [phone]

Int’l Fax [phone]

[e-mail]

http://www.dbxpro.com

18-0348 -A 9/05

Analog Inputs: (4)

A Harman International Company

Connectors: Female XLR
Type: Electronically balanced, RF filtered
Impedance: >50k ohms
Maximum Input Level: Software selectable for: +28, +26,+24, +22, +20, +18, +16, +14 dBu
CMRR: >40 dB typical, >55 dB at 1 kHz

Digital Inputs: (4) AES/EBU Channels
Connectors: Female XLR
Type: Transformer Isolated, RF filtered
Impedance: 110 ohms

RTA Input: (1) Analog
Connectors: Female XLR
Gain range: 20 dB to 50 dB in 10 dB increments

Analog Outputs: (8)
Connectors: Male XLR
Type: Electronically balanced, RF filtered
Impedance: 30 ohms
Max Output Level: Software selectable for: +24, +22,+20, +12, +8, +4 dBu

Digital Outputs: (8) AES/EBU Channels
Connectors: Male XLR
Type: Transformer Isolated, RF filtered
Impedance: 110 ohms

A/D Performance

Type: dbx Type IV™ Conversion System
Dynamic Range: >113 dB unweighted, 116 dB A-weighted
Type IV™ dynamic range: 126 dB with transient material, A-weighted,22 kHz BW

Sample Rate: 96 kHz
A/D Wordlength: 24 bits

D/A Performance

Dynamic Range: 112 dB unweighted, 115 dB A-weighted
Sample Rate: 96 kHz
D/A Wordlength: 24 bits

System Performance

Dynamic Range: 110 dB unweighted, 113 dB A-weighted
Internal Processing: 32 bit floating point
THD + Noise: 0.004% typical at +4 dBu, 1 kHz, 0 dB input gain
Frequency Response: 20 Hz- 20 kHz, +/-0.25 dB, <10 Hz- 50 kHz +0/-3dB @ 96kHz
Interchannel Crosstalk: <-85 dB at 1 kHz, 0 dB input gain

123 dB with transient material, unweighted, 22 kHz BW
118 dB typical with program material, A-weighted,22 kHz BW

Processing

Pre EQ Type: One 31-band Graphic EQ on each input One EQ that is switchable

Range: +/- 15 dB

Input Insert Processing: Two selectable Insert Processing blocks per input
Type: Noise Gate, Compressor, Auto Gain Control,De-Esser, Sub-Harmonic

Input Delay Length: Up to 682 mSec available

Routing/Mixing: 4-input mixer available at each output allowing any input to be sent or

Output Insert Processing: Two selectable Insert Processing blocks per output
Type: Noise Gate, AutoWarmth

X-Over Filter Configs: 1x1, 1x2, 1x3, 1x4, 1x5,1x6, 1x7,1x8, 2x2, 2x3, 2x4

Types: Bessel 6, 12, 18, 24, 36 and 48 dB per Octave

Polarity: Positive and Negative
Phase Control: 0 to -180 degrees in 5 degree increments

Output Delay Length: 1365 mSec shared between the outputs

Miscellaneous:

I/O Transformers: Optional, Jensen®JT-11 & JT-123-dbx

®

I/O: Optional

CobraNet
Control: Ethernet, RS-232, Optional dbx ZC Wall Panels

Power Requirements: 100V to 240V 50/60Hz, 35 Watts

Dimensions: 3.5” x 19” x 12.15”
Weight: 11 lbs. (14 lbs.w/audio transformers)
Shipping Weight: 12.5 lbs. (15.5 lbs. w/audio transformers)

between 31-band Graphic and 9-band Parametric on each input

Synth, Notch filters and Advanced Feedback Suppression

mixed to any output

®

Sub-Harmonic Synth

2x5, 2x6, 2x7,2x8, 3x3, 3x4,3x6, 3x7, 4x4, 4x8

Butterworth 6, 12, 18,24, 36 and 48 dB per Octave
Linkwitz-Riley 12, 24, 36, and 48 dB per Octave

, Compressor, Auto Gain Control,Peak Limiter,

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

The Professional’s Choice In Signal Processing

FOR MORE INFORMATION CONTACT:

dbx Professional Products 8760 S. Sandy Pkwy. Sandy, Utah 84070

Phone [phone] / Fax [phone]

[e-mail] / http://www.dbxpro.com

™