DBX 704X Owner's Manual

704X

Important Safety Instructions

The dbx 704X should only be used in a dbx 786, 160S, or a 160SL. Please follow the safety instructions contained in the manual for the product in which the dbx 704X is installed.

Notes

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Digital Output Card

Introduction

Congratulations on your purchase of the dbx 704X Digital Output Card. The 704X interfaces with your dbx Blue Series product for a premium analog to digital conversion. Below is a list of the features found on the 704X:

•Sample rates at 44.1, 48, 88.2, and 96 kHz

•Wordlength output at 16, 20, or 24 bits

•Dither to 16, 20, or 24 bits using TPDF or SNR2 algorithms

•dbx Type IV™ A/D Conversion System

•Sync input/output using low jitter phase-locked loops

•Two user selectable noise shaping algorithms for lower perceived noise floor

•Digital output on gold plated connectors

•Can be installed in a dbx 160S/SL Compressor or a dbx 786 Precision Microphone Preamplifier

Service Contact Information

If you require technical support, contact dbx Customer Service. Be prepared to accurately describe the problem. Know the serial number of your unit - this is printed on a sticker attached to the rear panel. If you have not already taken the time to fill out your warranty registration card and send it in, please do so now.

Before you return a product to the factory for service, we recommend you refer to the manual. Make sure you have correctly followed installation steps and operation procedures. If you are still unable to solve a problem, contact our Customer Service Department at (801) 568-7660 for consultation. If you need to return a product to the factory for service, you MUST contact Customer Service to obtain a Return Authorization Number.

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704X

No returned products will be accepted at the factory without a Return Authorization Number.

Please refer to the Warranty below, which extends to the first end-user. After expiration of the warranty, a reasonable charge will be made for parts, labor, and packing if you choose to use the factory service facility. In all cases, you are responsible for transportation charges to the factory. dbx will pay return shipping if the unit is still under warranty.

Use the original packing material if it is available. Mark the package with the name of the shipper and with these words in red: DELICATE INSTRUMENT, FRAGILE! Insure the package properly. Ship prepaid, not collect. Do not ship parcel post.

Warranty

This warranty is valid only for the original purchaser and only in the United States.

1.The warranty registration card that accompanies this product must be mailed within 30 days after purchase date to validate this warranty. Proof-of-purchase is considered to be the burden of the consumer.

2.dbx warrants this product, when bought and used solely within the U.S., to be free from defects in materials and workmanship under normal use and service.

3.dbx liability under this warranty is limited to repairing or, at our discretion, replacing defective materials that show evidence of defect, provided the product is returned to dbx WITH RETURN AUTHORIZATION from the factory, where all parts and labor will be covered up to a period of two years. A Return Authorization number must be obtained from dbx by

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Digital Output Card

telephone. The company shall not be liable for any consequential damage as a result of the product's use in any circuit or assembly.

4.dbx reserves the right to make changes in design or make additions to or improvements upon this product without incurring

any obligation to install the same additions or improvements on products previously manufactured.

5The foregoing is in lieu of all other warranties, expressed or implied, and dbx neither assumes nor authorizes any person to assume on its behalf any obligation or liability in connection with the sale of this product. In no event shall dbx or its dealers be liable for special or consequential damages or from any delay in the performance of this warranty due to causes beyond their control.

Installation

1.Remove lid of the 160SL or 786 by removing 6 phillips head screws (2 each side, 2 on the back) and 1 hex screw (top and center of front panel).

2.Remove the 4 silver screws holding the option cover plate on the rear.

3.Place the 704X in the 160SL/786 from the inside and note mounting holes labeled "A", "B", and "C".

4.Remove the 704X and then remove the 3 screws mounted in the 160SL/786 main board directly below points "A", "B", and "C" when the 704X is installed.

5.Install the 3 taller threaded standoffs where the three screws were removed.

6.Install the ribbon cable onto the blue header in the 160SL/786 next to the power supply housing.

7.Install the 704X by placing it in the 160SL/786 and then replacing the 4 silver screws into the rear option slot.

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704X

8.Install one of the three screws removed from the main board at point "C" on the 704X.

9.Install the two shorter standoffs at points "A" and "B" on the 704X.

10.Insert the ribbon cable from the main board to the blue connector on the 704X.

11.Install the upper 704X PCB by lining up the two standoffs with the mounting holes on the upper PCB.

12.Install the last two screws into the standoffs holding the upper 704X PCB.

13.Replace cover.

dbx 704X installed in a 786 Mic Preamp

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Rear Panel

AES/EBU OUTPUT Connector: The 704X provides AES/EBU digital output format through the XLR connector. Be sure to use short lengths of 110Ω digital cables rather than standard XLR to XLR cables. Using the correct cables will prevent digital dropouts and other interconnect problems.

SYNC IN and OUT Connectors: BNC connectors are provided for both sync in and out. The 704X uses low jitter phased-locked loops to slave to another unit’s wordclock output through the 704X’s SYNC in jack. The 704X will accept a 44.1, 48, 88.2, or 96 kHz wordclock input, or a 44.1 or 48kHz superclock (256X sample rate). You also may use the 704X as a master clock through the SYNC out BNC jack to supply stable clocks to other processors that accept a sync input. See "Sync Input" for further information.

SYNC LED: The SYNC LED will light red when the 704X is locked to an external clock through the SYNC IN BNC jack. Note that one of the RATE LEDs will light to indicate the clock frequency of the external source.

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