User manual ART DIGITAL MPA II

[. . . ] DIGITAL MPA IITM ART DIGITAL MPA IITM Microphone Preamplifier USER'S GUIDE IMPORTANT SAFETY INSTRUCTIONS ­ READ FIRST This symbol, wherever it appears, alerts you to the presence of uninsulated dangerous voltage inside the enclosure. This symbol, wherever it appears, alerts you to important operating and maintenance instructions in the accompanying literature. Please read manual. Read instructions: Retain these safety and operating instructions for future reference. Do not open: Aside from two vacuum tubes, there are no user serviceable parts inside. [. . . ] at one extreme or another. 6 When the switch is in the "Dual" position the output controls act on only their respective channels. +4/-10 switch (rear panel) The +4/-10 switch is used to set the output level of the DIGITAL MPA II for the appropriate system levels. This feature allows you to match 0 VU on the meters of the DIGITAL MPA II and your mixer or other equipment. When depressed, 0 VU on the output meter corresponds to +4dBu on the outputs. Meter Trim The Meter Trim is used to adjust the Meter's "0" point when. This may change if the unit is NOT mounted with the front panel perpendicular to the floor. Using a small flat-blade screwdriver you can mechanically fine-tune the meter indicator position if, for example, it does not rest at the leftmost position when the unit is OFF. Adjustments for feedback readings, when the unit is in use, are internal and are not user serviceable. Digital section front panel controls Digital Level control The levels driving the A/D converter are adjusted with this control. The topology of the DIGITAL MPA II lends itself to simultaneous use of the analog and digital outputs, as each has its' own level control. Located before the Digital Level control is the insert jack, allowing processing to be added before digital conversion. 7 As the Digital Level control is used refer to the Digital Level LED meter which indicates both peak and average level present at the A/D converter input. This meter helps you get the perfect level adjustment and avoid clipping the A/D. Refer to the section titled "Obtaining the perfect digital level setting" for more detail on the operation and use of these features. Sample Rate control The Sample rate knob determines both the output sample rate of the DIGITAL MPA II as well as the dither. You can select either AES/EBU (pro) format or S/PDIF (consumer) data format. The internal sample rate can be set from 44. 1KHz to 192KHz. Simply select the correct rate by turning the knob to the rate you need and the DIGITAL MPA II will use its' internal crystal controlled oscillator to accurately generate the selected timing. Each sample rate has the option of either 24 bit or 16 bit dither (i. e. Some equipment is not capable of the available sample rates and may produce damaging side effects. Always turn down levels following the DIGITAL MPA II when changing the sample rate. Wordclock is a 5V logic level signal interfaced by a BNC connector on the rear of the unit. The Range of wordclock accepted by the DIGITAL MPA II is 28KHZ to 212 kHz. It is recommended that you use wordclock whenever possible, as this will minimize interface errors with other equipment. NOTE: When using the ADAT optical output, the maximum sample rate is limited to about 50KHz. The ADAT Input on the rear panel is used as a timing reference as well as a source of data to be passed on to the ADAT output of the DIGITAL MPA II. If the unit CANNOT sync to an external source (either out of range, not connected or a system failure), the optical Output select switch will blink. [. . . ] You may want to consult with your dealer for assistance in troubleshooting or testing your particular configuration. 2) If you believe the ART unit is at fault, go to www. artproaudio. com. You may contact Customer Service for more assistance, or directly request a Return Authorization for service in the "resources" area of the website. 3) If you are returning the unit for service, pack the unit in its original carton or a reasonable substitute. [. . . ]