LavryBlue 4496

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Contents

Product Description

The LavryBlue 4496 is a modular system that can house stereo AD, DA, and MicPre modules. There are four "slots" available in each 4496 chassis, and multiple chassis can be used together for additional channels in multi-track applications. Each converter module occupies one slot and each MicPre module occupies two slots. The 4496 can be ordered with as few as one module or up to eight channels of conversion. The MSYNC module provides clock and external synchronization to all AD modules in a chassis, as well as a BNC Word Clock output.

For more information on the LavryBlue 4496 click here

For general information see digital to analog converter, analog to digital converter, microphone preamplifier.

Features

Clocking (MSYNC)

Analog to Digital (MAD-824)

Digital to Analog (MDA-824)

Preamplification (MicPre)

Applications

Connections

Analog outputs

The MDA-824 and MicPre have XLR line outputs for balanced or unbalanced connection. XLR to RCA adapters or adapter cables can be used for connection to equipment with RCA inputs. The factory default setting is for 0dBFS = +24dBu.

The XLR outputs can be configured for balanced or unbalanced connection using the internal jumper settings for "pin 2" and "pin 3;" which refer to the pin numbers of the XLR output connectors. The standard wiring for XLR to RCA adapters or adapter cables is to connect Pin 3 to Pin 1 ("ground") and pin 2 carries the signal. Thus, the correct internal jumper setting for both the XLR to RCA adapters and standard adapter cables is "Pin 2 Hot unbalanced." Please see the LavryBlue manual for setting instructions, and the Operation section of the manual for more details.

The XLR output is Pin 2 "+" and Pin 3 "-" for normal signal polarity. Thus, for the MDA-824 with balanced or unbalanced Pin 2 "+" connections, the signal polarity is "normal" or "non-inverted" when the front panel POLARITY switch is set to "Pin 2." Changing the Polarity setting to "Pin 3" will result in inverted signal polarity for balanced and unbalanced Pin 2 "+" connections.

The MicPre does not have a polarity setting. The XLR output is Pin 2 "+" and Pin 3 "-" for normal signal polarity as long as the input is connected with Pin 2 "+" wiring.

Analog inputs

The MAD-824 has balanced XLR inputs. The balanced configuration is recommended for both balanced and unbalanced line level sources. The factory default setting is for +24dBu = 0dBFS.

The XLR input is Pin 2 "+" and Pin 3 "-" for normal signal polarity when the internal DIP switch position #2 setting is "Off" (the factory default setting). Thus, for the MAD-824 with balanced or unbalanced Pin 2 "+" connections, the signal polarity is "normal" or "non-inverted." Changing the internal DIP switch position #2 setting to "On" will result in inverted signal polarity for balanced and unbalanced Pin 2 "+" connections.

The XLR input of the MicPre is designed to accept only low-impedance balanced professional microphone inputs or ribbon microphone inputs. The input offers excellent common-mode rejection and the polarity matches the XLR output (Pin 2 "+"). Phantom power is applied to both inputs when “Condenser” is selected via the front panel impedance matching switch.

Digital input

The MDA-824's digital input is a female XLR connector; which can accept AES inputs or SPDIF inputs using a simple wired XLR to RCA adapter or adapter cable. Use of an impedance matching transformer is not recommended as long as guidelines for coaxial SPDIF connection cable length are followed.

The status of the digital input is displayed on the MDA-824 front panel by a Lock indicator and sample frequency indicators. If the input is "locked" to a valid signal; the front panel Lock indicator will illuminate. If it is not locked due to no connection or an invalid signal; the Lock indicator will flash. If you have any problem when setting up the MDA-824, please check the Lock indicator to see if the MDA-824 is locked to a valid input signal.

Digital output

The MAD-824's digital output is a male XLR connector; which transmits AES stereo digital audio. The output can be used to feed most SPDIF inputs by using a simple wired XLR to RCA adapter or adapter cable. Use of an impedance matching transformer is not recommended as long as guidelines for coaxial SPDIF connection cable length are followed.

Synchronization

The MSYNC multichannel synchronization module provides BNC connections for Sync input and Word Clock output. The Sync input can accept either Word Clock or AES sync, and the type of sync is selectable using the front panel Internal/Word Clock/AES switch. The front panel also has a "Lock" indicator that illuminates when the MSYNC is synchronized to the external input (but never during internal clock operation). There are setting for the sample frequency; which must be set properly for internal or external operation, and a "Wide-Narrow" PLL mode switch for external operation. Narrow provides the lowest jitter external synch. operation, and Wide mode is provided for non-standard frequencies between 40 and 50 kHz (such as vari-speed applications); but will not provide as much immunity from jitter as the Narrow mode.

There is also a "2X" switch on the MSYNC rear panel to be used ONLY when feeding the MSYNC a sync signal at one-half the output sample frequency of the MAD-824 in external operation. If you cannot get the MSYNC to show "Lock" to an external 88.2 or 96kHz sync signal; double-check the setting of the 2X switch to be certain it is "Off."

AC Power

90-264 VAC @ 47-63Hz

The power supply automatically adjusts to AC inputs in the range of 90 to 264 volts at line frequencies between 47 and 63 Hz. It is not necessary to change any settings.

Operating tips

Adding and Removing Modules

6-32 Flat Head + Undercut Head.jpg

For complete instructions, please navigate to the “Manuals and Other Downloads” section under the SUPPORT tab of our website lavryengineering.com, and download the document titled: “Upgrading your LavryBlue”

Upgrading your LavryBlue

There are instructions on disassembling and re-assembling the 4496, including important details like the fact there are two different types of screws holding the front panel in place. Please use the longer conical head screws only through the rack ears and the shorter undercut head screws in the top and bottom covers.

Software

The current revisions for the software, which is visible on the label of the PROM on each module, are:

MAD-824: V1.5A

MDA-824: V1.3

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