User manual LAVRY 4496

[. . . ] LavryBlue Series Model LE·4496 Modular Audio System Operations Manual Lavry Engineering, Inc. PO Box 4602 Rolling Bay, WA 98061 (360) 598-9757 http://lavryengineering. com/ e-mail: techsupport@lavryengineering. com Revision 2. 0C April 2007 LavryBlue Operations Manual Table of Contents Page 1) LavryBlue 4496 System Overview 2) M·SYNC Multi-channel Sync Module a) Overview b) Operation c) Specifications 3) M·AD-824 Analog to Digital Converter a) Operation b) Settings c) Specifications 3. ) M·DA-824 Digital to Analog Converter a) Operation b) Settings c) Specifications 4. ) MicPre Microphone Preamplifier a) Operation b) Settings c) Specifications 5. ) Opening the 4496 6. ) 4496 Chassis Specifications 7. ) Warranty 17 18 18 19 19 20 13 15 16 7 10 12 4 5 6 3 2 LavryBlue LavryBlue 4496 System Overview Operations Manual The LavryBlue System is a modular 1U high 19 inch rack unit, configurable to accommodate multiple functions including Digital to Analog conversion, Analog to Digital conversion, and Microphone Preamplification. The hardware is designed to operate at industry standard 44. 1, 48, 88. 2 and 96 kHz sampling rates, with the additional flexibility in "Wide Mode" of operation from external clocks at non-standard or variable sample rates in the ranges of 42 to 50 kHz and 84 to 100 kHz. The Lavry Blue chassis contains a power supply equipped with additional output power noise filtering. [. . . ] This indicates that you analog reference level ("0dBVU" for example) corresponds to the digital reference level of the M·AD-824. You can also set the level above or below the reference mark for reference levels between the available marks (for example, five lamps below "­10 reference level" would be "-11dB"). Remember each lamp is ~0. 2 dB's of level change in reference mode. 9 LavryBlue Operations Manual 9. ) MASTER-SLAVE MODES A module may operate in either master or slave mode. A Master module is located in the leftmost chassis position and set to "master" via its internal DIP switch (position 1 set to "ON"). All the other modules can be set to "slave" (using each one's DIP switch- position 1 set to "OFF"). Slave module parameters may be programmed independently via the slave module's own front panel switch. However, the master-slave relationship will override such settings; the next time the master module parameters are programmed, the settings will change immediately on all the slaves as well. So if you want to program different settings on Slave modules, be sure to program the MASTER FIRST. When the frame is powered "ON, " the slaves will always emulate the nearest master module. When the power is turned on, the -9dB lamps will remain steady on slave modules. See the "Settings" section (below) for DIP switch location. M·AD-824 SETTINGS EXTERNAL SETTINGS on M·AD-824 front panel: Wordlength selection between 24, 20 and 16 bits Analog soft saturation, "rounding off signal peaks" to enable driving the ADC harder for extra hot recording Digital soft saturation, emulates tape saturation ­ enabling 6dB hotter operation for signals under 12dBFS Reference Meter Bridge with ­10, -12, -14, -16, -18 and ­20dBFS reference points Peak-Hold, to hold and indicate the highest peak indicated by the meters. It is reset when quickly operating the front panel switch Dither, for proper truncation to 20 or 16 bit word length. ABC-1 and ABC-2, similar to dither, but with added noise-shaping processing. The various parameters are retained in a non-volatile memory; thus, turning the power on will restore the last set of parameters programmed by the user INTERNAL SETTINGS: The M·AD-824 has a number of internal settings, which can be accessed by removing the top cover (please see "Opening the LavryBlue" Page 20). There is a "DIP switch" located on the M·AD-824 PC board that controls a number of parameters. There is also a "jumper" which can be used to set the threshold for Analog Saturation mode. The polarity of the XLR inputs on the M·AD-824 is configured at the factory for: Pin 2 "+" (non-inverting) & Pin 3 "-" (inverting) It is possible to switch the polarity to Pin 2 "-" & Pin 3 "+" by changing the setting of the DIP switch Position 2 from "OFF" to "ON. " 10 LavryBlue ( M·AD-824 Internal Settings- cont. ) Operations Manual DIP switch settings: Position 1: Position 2: Position 3: Position 4: On ­ Master On ­ XLR Pin 3 "+" On ­ gentle ABC future enhancements Off - Slave Off- XLR Pin 2 "+" Off ­ aggressive ABC Please Note: "XLR Pin "+" refers to the "non-inverting" input. The opposite signal pin would be the "inverting input" for balanced operation. For example Pin 2 "+" would mean Pin 3 was "-" or "inverting. " Jumpers Settings: Balanced Audio Input Configuration: Please Note: In order to maintain good noise rejection qualities, Lavry Engineering recommends that you use balanced inputs for unbalanced sources as well. Four jumpers (J1, J2, J3 and J4) are located behind the analog input XLR connectors: Please be sure to leave the jumpers set for balanced operation. The settings are: J1 to "IN-P3, " J2 to "IN-P2, " J3 to "IN-P3, " and J4 to "IN-P2" Soft Saturation: Jumper- J6 enables the lowering of the threshold for the analog soft saturation feature, and is labeled to denote the THRESHOLD. The default mode is a connection between the center pin and the front pin- HIGH position. [. . . ] First, BE SURE THAT YOU UNPLUG THE AC POWER CORD FROM THE BACK OF THE 4496 FRAME!Use a #2 Phillips screwdriver to remove the ten Phillips head recessed screws that hold the top cover in place. Once these screws are removed, you can safely remove the top cover to reveal the printed circuit boards. - Please refer to the individual module's "Settings" section for the available switch settings and jumper options. [. . . ]