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dbx Driverack 481

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Product 183071
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The dbx DriveRack 481 is a slave unit that includes all of the functionality and features of the DriveRack 480 and incorporates 4 inputs and 8 output...Click To Read More About This Product

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27 different crossover configurations and much, much more.

The dbx DriveRack 481 is a slave unit that includes all of the functionality and features of the DriveRack 480 and incorporates 4 inputs and 8 outputs with Euroblock connectors. However, the 481 does not include the front-panel programming interface. All programming functions can be performed through the 480, the 480R, or via the Windows GUI. An unlimited number of slaves can be chained together.

The dbx DriveRack series offers complete integration of all of the elements required to achieve state-of-the-art loudspeaker management. The 481 DriveRack was designed to provide 4 independent input and 8 output channels of processing power that include 31-band graphic equalizers, as well as dbx's industry-standard dynamics processing. All aspects of the 481's features can be controlled by the included dbx Professional Products Interactive DriveWare software. Software updates can also be downloaded instantly from through the RS 232 port.

The DriveRack 481 includes pre-crossover EQ, dual RTAs, notch filters, speaker delays, multiple crossovers and compression/limiting, as well as numerous other features. Dual RTA analyzers can be run simultaneously with RTA source inputs capable of being remotely switched on the fly.

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, and Linkwitz-Riley crossover filters
27 different crossover configurations
Time alignment and transducer alignment delays
Compressor/limiter on every output
Speaker compensation EQ (post crossover)
Multilevel security system
Separate house and show EQ with individual lockout
Triple redundant back-up of all parameters 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
Number of Inputs: 4
Connectors: Euroblock
Type: Electronically balanced/RF filtered
Impedance: >40kOhm
Maximum Input Level: Hardware selectable for +30, +22, +14, dBu
CMRR: >40 dB typical, >55 dB at 1kHz

Number of Outputs: 8
Connectors: Euroblock
Type: Electronically balanced, RF filtered
Impedance: 120 ohm
Max Output Level: +25.5 dBu into 1kOhm, +22dBu into 600 ohm

A/D Performance
Type: dbx Type IV Conversion System
Dynamic Range line: >112 dB unweighted, 115 dB A-weighted Type IV
Type IV dynamic
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
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

Output Transformers: 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 - 50/60Hz 35 Watts
Dimensions: 1.75"H x 19"W x 7.90"D
Weight: 8 lbs.
Shipping Weight: 9.5 lbs.

Review Snapshot

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(based on 1 review)

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Reviewed by 1 customer

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By TJ Wuth

from Fresno

See all my reviews

I've been using this unit for two years in a four-way system for a contemporary church. This unit is quite limited in just about everything but inputs and outputs. PC control is through RS232 rather than Ethernet, The PC GUI is vague and does not give much information. There is no help file for it either. Crossover points and configurations are limited as well. The Rane RPM88 is a much better product in all of the above categories.

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