LavryGold AD122-96 MkIII

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*The AD122-96 MkIII is calibrated at the factory for +24dBu = 0dBFS. If your studio uses +18dBu = 0dBFS (which is the same as “-14dBFS = 0dBVU = +4dBu); you will need to increase the input gain using the front panel GAIN trimmers. The FINE mode of the meters effectively “expands” the resolution of the meters around the reference level so that each LED segment equals a level change of 0.2dB (two-tenths of a dB). Both FINE mode On/Off setting and the reference level setting are available in the BAR-GRAPH & DISPLAY SCREEN. A The reference level can be set between -20 and -10 dBFS in one dB steps.
 
*The AD122-96 MkIII is calibrated at the factory for +24dBu = 0dBFS. If your studio uses +18dBu = 0dBFS (which is the same as “-14dBFS = 0dBVU = +4dBu); you will need to increase the input gain using the front panel GAIN trimmers. The FINE mode of the meters effectively “expands” the resolution of the meters around the reference level so that each LED segment equals a level change of 0.2dB (two-tenths of a dB). Both FINE mode On/Off setting and the reference level setting are available in the BAR-GRAPH & DISPLAY SCREEN. A The reference level can be set between -20 and -10 dBFS in one dB steps.
 
*The AD122-96 MkIII will not un-mute unless it is receiving a valid clock signal in any external clock mode. This will only occur when the front panel Lock indicator is illuminated.  When operating on external clock with a "known-good" analog signal connected to the inputs, if the AD122-96 MkIII does not appear to pass a signal (no activity on front panel meters and digital output is muted), check that the MAIN screen setting is to the correct sample frequency and type of sync (BNC or XLR AES).
 
*The AD122-96 MkIII will not un-mute unless it is receiving a valid clock signal in any external clock mode. This will only occur when the front panel Lock indicator is illuminated.  When operating on external clock with a "known-good" analog signal connected to the inputs, if the AD122-96 MkIII does not appear to pass a signal (no activity on front panel meters and digital output is muted), check that the MAIN screen setting is to the correct sample frequency and type of sync (BNC or XLR AES).
* The BNC Word Clock input of the AD122-96 MkIII IS NOT internally terminated. Although in most cases termination is not necessary with short cables in point to point connection (the signal is not “chained” to other slave devices); if you experience problems getting the MkIII to lock to a “known-good” external BNC Word Clock signal, a BNC “T” should be placed on the Word Clock input of the MKIII and a 75 Ohm NNC terminator placed on the “T” opposite the incoming Word Clock cable to provide termination. External clock units that have termination “auto sensing” often require the AD122-96 MkIII’s Word Clock input terminated to function properly.
+
* The BNC Word Clock input of the AD122-96 MkIII IS NOT internally terminated. Although in most cases termination is not necessary with short cables in point to point connection (the signal is not “chained” to other slave devices); if you experience problems getting the MkIII to lock to a “known-good” external BNC Word Clock signal, a [[BNC “T”]] should be placed on the Word Clock input of the MKIII and a 75 Ohm [[BNC terminator]] placed on the “T” opposite the incoming Word Clock cable to provide termination. External clock units that have termination “auto sensing” often require the AD122-96 MkIII’s Word Clock input terminated to function properly.
 
*The internal tone generator can be used to confirm the AD122-96 MkIII digital output is connected and synchronized properly. The settings are available in the TEST TONE screen, and the analog input is muted when the internal tone generator is activated.   
 
*The internal tone generator can be used to confirm the AD122-96 MkIII digital output is connected and synchronized properly. The settings are available in the TEST TONE screen, and the analog input is muted when the internal tone generator is activated.   
 
* When employing “input clipping” to achieve elevated digital levels, use of some front panel Gain is recommended to avoid overloading the analog input stage prior to the input of the AD converter stage. For example; if the input level will exceed +24dBu; it is recommended that the minimum amount of gain corresponds roughly to the number of dB’s the input level would need to exceed +24dBu with the factory setting to achieve the desired amount of “clipping.” By increasing the Gain, the input level will remain below +24dBu and still result in the desired amount of “clipping” without overload at the input stage.
 
* When employing “input clipping” to achieve elevated digital levels, use of some front panel Gain is recommended to avoid overloading the analog input stage prior to the input of the AD converter stage. For example; if the input level will exceed +24dBu; it is recommended that the minimum amount of gain corresponds roughly to the number of dB’s the input level would need to exceed +24dBu with the factory setting to achieve the desired amount of “clipping.” By increasing the Gain, the input level will remain below +24dBu and still result in the desired amount of “clipping” without overload at the input stage.

Revision as of 18:49, 4 August 2017

Contents

Product Description

The LavryGold AD122-96 MkIII is a high-end stereo AD converter intended primarily for Mixing and Mastering applications; with balanced professional level XLR inputs and an XLR/AES digital output. There is a BNC Word Clock input and output, as well as an XLR/AES sync input for external synchronization.

The LavryGold AD122-96 MkIII converter operates in a linear manner throughout the entire input range up to 0dBFS. When the input exceeds the level that would result in 0dBFS, the signal is clipped in a clean manner. The LavryGold AD122-96 MX offers increased ability to handle clipping without audible degradation compared to the LavryGold AD122-96 MkIII.

For more information on the LavryGold AD122-96 MkIII click here

For general information analog to digital converter.

Features

Applications

Connections

Line inputs

The AD122-96 MkIII has balanced XLR inputs. The balanced configuration is recommended for both balanced and unbalanced line level sources. Please note: for unbalanced connections, the peak input level is reduced to +18dBu. Use the front panel Gain trimmers to raise the input level a minimum of 6dB above the factory setting.

The XLR input is Pin 2 "+" and Pin 3 "-" for normal signal polarity when the Polarity setting in the Audio Control Screen is “+ POLARITY”. Thus, for the AD122-96 MkIII with balanced or unbalanced Pin 2 "+" connections, the signal polarity is "normal" or "non-inverted." Changing the Audio Control Screen setting to “- POLARITY” will result in inverted signal polarity for balanced and unbalanced Pin 2 "+" connections.

Digital output

The digital output of the AD122-96 MkIII 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 AD122-96 MkIII provides BNC connections for Word Clock input and Word Clock output. The XLR AES Sync input can accept AES sync, and the type of sync is selectable in the Main screen of the front panel LCD display. The front panel also has a "Lock" indicator that illuminates when the AD122-96 MkIII 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. Both “BNC WIDE LOCK” and “XLR AES WIDE LOCK” settings are 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 sample frequency specific modes, which employ a sophisticated crystal-referenced internal clock signal to ensure performance is virtually the same when operating on internal or external clock. There are also "2X" settings to be used ONLY when feeding the AD122-96 MkIII a sync signal at one-half the digital audio output sample frequency in external clock operation. They appear as “BNC WC LOCK 88/44," “BNC WC LOCK 96/48,” “XLR AES LOCK 88/44,” and “XLR AES LOCK 96/48” in the Main Screen.

AC Power

90-264 VAC @ 47-63Hz , Fuses 0.5A Fast Blow 250V Fuse Size 5mm x 20mm (Replaces older 0.25inch x 1.25 inch size)

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.

See LavryGold voltage setting for details on the AC power voltage setting and accessing the fuses.

Operating tips

Software

The current software revision which is displayed during initialization on the front panel LCD screen is: 2.1e

Upgrade/Repair

The previous model AD122-96 MkII can be upgraded to the MkIII version, and all MkII converters returned for service will be upgraded to the MkIII version as a matter of policy.

Please note that ALL models previous to the MkII cannot be repaired or upgraded due to lack of availability of parts used in these models (the parts were discontinued by the companies which manufactured them).

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