Benchmark MPA1 Manual de Instruções descarregar pdf (Página 36)

PRE420 Instruction Manual – rev. E Page 36

21. Set audio tone generator to 1 kHz with

an output level of -36 dBu (or level

used in step 3).

22. Connect tone generator to microphone

1 input.

23. Connect audio level meters to “Control

Room” L & R outputs.

24. Adjust Channel 1 “Pan Bal” (R27) until

the “Control Room” L & R outputs are

balanced.

25. Move generator to microphone 2 input

and adjust Channel 2 “Pan Bal” (R81).

Repeat for channels 3 and 4 (R142

and R219).

Main Gain Balance

26. Release all push buttons on front

panel.

27. Microphone 1 “Gain” control must be

fully clockwise.

28. Set “Main” level control at maximum

gain (fully clockwise).

29. Set audio tone generator to 1 kHz with

an output level of -36 dBu (or level

used in step 3).

30. Connect tone generator to microphone

1 input.

31. Connect audio level meters to “Main” L

& R outputs.

32. Adjust “Main Gain Bal” (R338) until

the “Main” L & R outputs are balanced.

Peak LED Adjust ---- Main

Outputs

33. Release all push buttons on front

panel.

34. Microphone 1 “Gain” control must be

fully clockwise.

35. Set audio tone generator to 1 kHz with

an output level of -36 dBu (or level

used in step 3).

36. Connect tone generator to microphone

1 input.

37. Connect audio level meters to “Main” L

& R outputs.

38. Adjust “Main” level control until output

levels are exactly +24 dBu.

39. Adjust “L Meter Threshold” (R296)

and “R Meter Threshold” (R304) until

the “Main” L & R red LEDs just turn on.

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