Lavry LavryBlue LE-4496 Operation Manual - page 16
LavryBlue 4496
Operation
12
(M•DA-824 Operation cont.)
Looking at the back of the 4496, each M•DA-824 module has a group of three XLR connectors. In each
group, the LEFT OUTPUT is the right male XLR and the RIGHT OUTPUT is the left male XLR
connector. The female XLR is the AES digital input.
This “mirror image” position of the analog outputs is due to the straight-through construction of the
modules. Facing the front of the 4496, the Left channel is on the LEFT and the Right channel is on the
RIGHT side of each module’s PC board.
The Digital input of the M•DA-824 is AES digital format, which is a 110 ohm balanced 5V standard. The
input is compatible with SPDIF format (75 ohm unbalanced), and can be “adapted” by using a simple
adapter cable or “barrel” adapter from RCA to XLR. In some cases it may be necessary to use a
transformer or simple electronic “level shifting” interface designed for this propose, but this not usually
necessary. Because the AES input is transformer coupled, the signal MUST connect to pin 2 and pin 3 of
the XLR connector. It is also OK to connect either Pin 3 or Pin 2 to Pin 1 (but not both) in XLR connector
that plugs into the AES input ONLY.
DO NOT connect Pin 1 to Pin 2 or Pin 3 of the AUDIO XLR’s for unbalanced operation without setting the
internal jumpers first! Please see “M•DA-824 Settings” section below (Page 16).
Interface Standard/ Connector type
Signal +
Signal -
Shield
AES XLR
Pin 2*
Pin 3*
Pin 1
SPDIF RCA
Center Pin
Outer Contact
Outer Contact
*Please Note: Because the AES/SPDIF signal is “polarity independent,” Pin 2 and Pin 3 can be
interchanged in the wiring scheme.
FRONT PANEL SWITCHES-
LOCK MODE-
Use the front panel switch to choose the lock mode that is best suited for your source.
Choose CrystalLock™ to activate specialized hardware to provide almost total jitter elimination from the
incoming digital signal This proprietary circuit utilizes a temporary buffer memory and a DSP controlled
instrumentation digital-to-analog converter to effectively “re-clock” the incoming data to a vastly more
stable internal crystal clock. The result is extremely low distortion and transparent imaging, even if the
source is especially "jittery."
Choose Narrow Lock to reduce the sampling frequency input range to lock to signals within +/-100ppm
(parts per million) around a fixed rate (44.1, 48, 88.2 or 96 kHz). Narrow lock operation provides improved
jitter rejection over Wide Lock when operating with a known fixed frequency.
Choose Wide Lock for applications requiring non-standard sample rates, including most normal varispeed
operations. It allows the sampling rate to run automatically between 42-50 kHz or 84-100 kHz. The
indicators for 44.1 AND 48 kHz light to indicate non-standard frequencies in the 42-50 kHz range, and the
88.2 AND 96 kHz indicators light to indicate non-standard frequencies in the 84-100 kHz range.
SAMPLING RATE AND LOCK INDICATORS-
The converter automatically detects the incoming sample rate and displays it via one of the 4 LED
indicators marked as 44.1, 48, 88.2 or 96 kHz. The Lock LED indicates that the module is locked to a
digital input when it is constantly illuminated.When the Lock indicator is flashing, it indicates that a
signal is not present or an unlocked condition exists (such as no signal or a missing cable at the digital
input, or a digital signal with an out-of-range sample frequency).