DriveRack

Appendix A

A.8 Gain Level Jumpers

CAUTION: These servicing instructions are for use by qualified service personnel only. To reduce the risk of electric shock, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so. Refer all servicing to qualified service personnel. Disconnect mains power before servicing.

The 480, 481 and 482 DriveRack™ units offer you the option of changing the input gain level settings. There are 3 hard- ware configurable gain settings. They are: +14 dBu, +22 dBu and +30 dBu. For these cases, use the following pro- cedure to change the gain level settings. Please be advised however, that once the gain level has been changed from the factory settings, the output meters will no longer be calibrated correctly.

To change the gain level, move the jumpers to the pins that are marked with the desired gain setting

1)First, ground yourself prior to opening the DriveRack™ chassis to prevent ESD damage.

2)Open the chassis by removing five screws on each side of the chassis and the top two center screws on the rear panel, as well as the top center allen screw located on the front panel

3)Locate the jumper block shown in the illustration below:

481 Top Board

 

Ch1

 

Ch2

 

Ch3

 

 

Ch4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ch1

+30dBu

 

 

 

 

Ch3

+30dBu

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+30dBu

 

+30dBu

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ch1

+14dBu

Ch2

 

Ch3

+14dBu

Ch4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ch2

 

 

 

 

 

Ch4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+22dBu

 

+22dBu

 

+22dBu

 

 

+22dBu

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+14dBu

 

 

 

 

 

+14dBu

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input Jumpers

 

 

 

 

 

 

Output Jumpers

 

 

 

 

 

 

 

 

 

 

 

 

+14dBu

 

 

+14dBu

+14dBu

 

 

+14dBu

+14dBu

 

 

+14dBu

+14dBu

 

 

+14dBu

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+22dBu

 

 

+22dBu

+22dBu

 

 

+22dBu

+22dBu

 

 

+22dBu

+22dBu

 

 

+22dBu

 

 

 

 

 

+30dBu

 

 

 

 

+30dBu

+30dBu

 

 

 

+30dBu

+30dBu

 

 

 

+30dBu

+30dBu

 

 

 

+30dBu

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

480 and 482 Top Board

 

Ch1

Ch2

 

 

 

 

 

 

 

 

 

+30dBu

 

+30dBu

+22dBu

+22dBu

+14dBu

+14dBu

Input Jumpers

NOTE: Inputs 3 and 4 are located directly beneath inputs 1 and 2 on the underside of the board. Outputs 5-8 are located directly beneath Outputs 1-4 on the underside of the board.

Output Jumpers

+14dBu

+22dBu

+30dBu

+14dBu

+22dBu

+30dBu

+14dBu

+22dBu

+30dBu

+14dBu

+22dBu

+30dBu

 

 

 

 

 

 

 

 

 

 

 

 

Ch1

Ch2

Ch3

Ch4

4)Set the jumpers to the desired input and output gain settings. Note that to change settings on inputs 3 and 4 and out- puts 5-8 of the 480 and 482, the top board must be removed.

5)Once the desired settings have been made, replace the chassis lid.

®

DriveRack™ User Manual

105

 

 

Page 113
Image 113
dbx Pro 480 user manual Gain Level Jumpers

480 specifications

The dbx Pro 480 is a professional-grade dynamics processor renowned for its versatility and exceptional performance in various audio applications. Designed for both live sound and studio environments, the dbx Pro 480 stands out as an essential tool for sound engineers and musicians alike.

One of the main features of the dbx Pro 480 is its dual-channel operation, which allows users to process two audio signals simultaneously. This functionality makes it particularly advantageous for stereo mixes, providing the ability to manage dynamics across left and right channels cohesively. The unit employs patented dbx OverEasy compression technology. This unique approach to compression allows for smooth transitions between compression and limiting, preventing abrupt changes in audio levels that can disrupt the listening experience. The result is a more musical sound, making it ideal for vocals, instruments, and other dynamic sources.

Additionally, the dbx Pro 480 boasts comprehensive control options, including adjustable ratio, threshold, attack, and release parameters. This level of control enables users to tailor the dynamics processing to fit specific audio material, whether subtle shaping or more aggressive control is required. The inclusion of a high-pass filter on the sidechain input further enhances its versatility, allowing for frequency-dependent dynamics processing that can be particularly useful in managing low-end rumble or controlling sibilance in vocals.

Another notable characteristic of the dbx Pro 480 is its robust build quality, designed to withstand the rigors of both studio and live environments. The device features a rugged metal chassis that protects its internal components while providing reliable performance under various conditions. Additionally, high-quality XLR inputs and outputs ensure that audio signals remain clean and free of interference.

In terms of connectivity, the dbx Pro 480 is equipped with balanced connections to minimize noise and signal degradation, making it suitable for professional setups. Its intuitive front-panel interface includes LED metering for easy monitoring of input and output levels, facilitating prompt adjustments on the fly.

In conclusion, the dbx Pro 480 is a powerful dynamics processor that blends advanced technology with user-friendly features. Its dual-channel processing, unique compression algorithms, and robust build quality make it a top choice for audio professionals seeking to enhance their sound with precision and control. Whether in a recording studio or a live performance setting, the dbx Pro 480 continues to be an invaluable asset in the audio processing landscape.