dbx Pro 481 User Manual

8760 S. Sandy Pkwy.

Sandy, Utah 84070

Phone (801) 568-7660

Fax (801) 568-7662

Int’l Fax (801) 568-7583

customer@dbxpro.com

http://www.dbxpro.com

A Harman International Company

18-0072-A 3/02

The goal was quite simple: design an all-inclusive product that offers a complete integration of all of the elements required to achieve state-of-the-art loudspeaker management. This design goal was reached and exceeded with introduction of the DriveRack

series. The 481 DriveRack®includes all of the functionality and features of the 480 DriveRack

. The 481 incorporates 4 inputs and 8 outputs using Euroblock connectors.

The 481 DriveRack

also has a streamlined front panel which makes it ideal for per-

manent install applications. All programming functions of the 481 DriveRack

can be performed through a 480 master, the 480R, or via the Windows GUI. By using the DriveRack

network system, up to 99 DriveRack®units can be chained together.

The 481 DriveRack®continues the legacy DriveRack®series, which has been created by the company that has been redefining the standard of signal processing for more than 30 years. dbx

Professional Products has created a product that caters to numerous applications in tour sound and sound contractor requirements. The 481 DriveRack

was designed with the purpose and vision of providing four independent input and eight output channels of processing power that include 31Band Graphic equalizers, as well as dbx’s own industry standard dynamics processing. All aspects of the aforementioned features can be controlled by the included dbx Professional Products Interactive DriveWare

™

software. Software updates can

also be downloaded instantly from www.dbxpro.com through the RS 232 port.

•

4 Input and 8 Outputs with routing

•

31 band graphic or 9 band parametric

equalizer on every input (pre-crossover)

•

Dual Real Time Audio Analyzers

•

Butterworth, Bessel or Linkwitz-Riley

crossover filters

•

27 Different Crossover Configurations

•

Time Alignment and Transducer

Alignment Delays

•

Compressor/Limiter on every output

•

Speaker Compensation EQ (post

crossover)

•

Multi-level Security System

•

Separate House and Show EQ with indi-

vidual lockouts

•

Triple redundant backup of all parame-

ters when running network, 480R and PC GUI

•

TYPE IV™ Conversion System

•

Electronically balanced/RF filtered

Euroblock Inputs and Outputs

•

Proprietary RS-485 Control Network

•

RS-232 PC Interface for computer

display and configuration

Inputs

Inputs: 4 Connectors: Euroblock Type: Electronically balanced/RF filtered Impedance: >40kΩ Max Input Level: Hardware selectable for +30,+22,+14, dBu CMRR: >40 dB typical,>55 dB at 1kHz

Outputs

Outputs: 8 Connectors: Euroblock Type: Electronically balanced,RF filtered Impedance: 120Ω Max Output Level: +25.5 dBu into 1kΩ

+22dBu into 600Ω

A/D Performance

Type: dbx Type IV™ Conversion System Dynamic Range line: >112 dB unweighted,115 dB A-weighted Type IV™ dynamic range: 127 dB with transient material,A-weighted, 22kHz BW 125 dB with transient

material,unweighted, 22kHz BW 119 dB typical with program material,

A-weighted,22kHz BW Sample Rate: 48kHz A/D Wordlength: 24 bits

D/A Performance

Dynamic Range: 112 dB unweighted,115 dB A-weighted Sample Rate: 48kHz D/A Wordlength: 24 bits

System Performance

Internal Wordlength: 48 bits THD + Noise: 0.003% typical at +4dBu,1kHz, 0dB input gain Frequency Response: 20Hz- 20kHz,+/-0.5dB Interchannel Crosstalk: <-85dB at 1kHz,0dB input gain

Pre EQ

Type: One 31-band Graphic EQ per input channel,or

9 band Parametric EQ per input channel

RTA can be substituted for EQ in channels 3 and 4 Range: +/-12 dB range

Notch Filters

Number: 1-5 per input channel not to exceed 10 for all input channels

Pre Delay

Length: 680ms/channel

Crossover

Type: 1x2,1x3, 1x4, 1x5, 1x6 2x3,2x4, 2x5, 2x6, 2x7, 2x8,

3x4,3x5, 3x6, 3x7, 3x8, 4x6, 4x8 Filter Type: Butterworth, Bessel, or Linkwitz-Riley

Slope: 6,12, 18 or 24 dB/octave for Butterworth or Bessel filters

12, 24, 36 or 48 dB/octave for Linkwitz-Riley filters

Post EQ

Type: Parametric Number: 4 EQ bands per output channel

Range: +/-15 dB range

Dynamics

Type: Compressor/Limiter with PeakStopPlus™ Attack/Release: Program Dependent Linking: All 8 bands are linkable

Post Delay (Driver Alignment)

Length: 170 ms per output channel

Pink Noise Generator

Position: Pink noise inserted on selected input(s)

Phase Compensation

Number: One per output channel Amount: 0-180 degrees phase shift Output Polarity: Reversible

Miscellaneous

Output Transf ormers: Optional Network: Proprietary RS-485 Backbone GUI: RS-232 interface for computer display and configuration Remote: Optional dbx 480R RTA Microphone: Optional ROM Upgrade: Flash upgradeable through RS-232

Power Requirements

Watts: 100-240V - 50/60 Hz

35 Watts

Dimensions

Dimensions: Height- 1.75” X Width- 19” X Depth 7.90” Weight 8 lbs.

Shipping Weight: 9.5 lbs.

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