Grass Valley 2020DAC D-To-A - Manual (Page 17)

2020DAC Instruction Manual 11
Configuration and Adjustments
Output Level Adjustments
The gain stage of each output channel CH1/2 (Left and Right) and CH3/4
(Left and Right) has two ranges of level adjustment—low and high (refer to
Figure 7 on page 9 ).
The High/Low jumpers (J1 – 4) select the range of adjustment either:
■ High range – 19 to 24 dBu, or
■ Low range – 14 to 19 dBu.
Fine control within those ranges is set using the multi-turn potentiometers
associated with each channel output providing ±3 dBu gain adjustment (do
not exceed 24 dBu). This combination gives a maximum range for full-
signal settings from +14 dBu to +24 dBu.
20/24-bit Operation
Jumper blocks JP8 (CH 3/4) and JP10 (CH1/2), pins 1 to 3, determine
whether the DAC is in 24-bit or 20-bit mode (see
Figure 7 on page 9 ).
■ With the jumper across pins 1 and 2, the DAC is in 20-bit mode and will
mask the lower four bits of information that are assumed to be non-
audio data.
■ With the jumper across pins 2 and 3, the DAC is in full 24-bit mode.
Input Select
Set jumper blocks JP11 (CH1/2 INPUT SEL) and JP9 (CH3/4 INPUT SEL)
to unbalanced or balanced to match the type of audio being fed to the
module.
■ For unbalanced audio inputs (75
Ω
BNC inputs), set each jumper block
to UNBAL, pins 1 and 2 (see Figure 7 on page 9 ).
■ For balanced audio inputs (110 Ω terminal blocks), set each jumper
block to BAL, pins 2 and 3.
Remote Control Lockout
When a jumper is placed across pins 5 and 6 of jumper block JP7, module
output mode settings are adjustable from the on-board switches only. To
have both Local and Remote access, set the jumper across pins 4 and 5 (see
Figure 7 on page 9 ).