User guide

821027: AMPx-SDA User Guide

AMPx-SDA User Guide

Front Panel Controls

two smaller LEDs labeled Fast (left side of the Phase section) show

instantaneous phase relationships in the signal, while the larger LED,

labeled

Avg (right side of the Phase section), will indicate the average

phase condition. The small

Fast LED on the left glows (or blinks) green

when signals are in-phase. The small Fast LED on the right glows (or

blinks) amber for out-of-phase signals. The larger

Avg LED indicates the

average phase condition by glowing green for in-phase conditions, or red

for out-of-phase conditions. In general, it is sufficient to regard the Avg

LED (average phase condition) as adequete for proper phase monitoring.

While it is normal for stereo signals to contain some intermittant

instanateous out-of phase and in-phase conditions (small LEDs), a

steady red glow of the larger LED almost always indicates an out-

of-phase alarm condition.

• Balance: This pans the volume balance between the left and right

speakers. If the balance is adjusted hard left or hard right, a slight

left/right channel mix is retained (only in low bass frequencies) so

that phase discrepancies can be discerned.

• SD-SDI Subgroup Select (1 or 2): This 2-position toggle switch

allows the operator to choose whether the unit will monitor sub-

group 1 or sub-group 2 of the SD-SDI data stream when the Digital

Source Select

switch is set to SDI. Subgroup selections 1 and 2

are derived from Group 1 as follows:

• Subgroup 1 = Channels 1 and 2

• Subgroup 2 = Channels 3 and 4

• Digital Signal Error LEDs: These two bi-color (Green/Red) LEDs

indicate the input presence and status of the two types of digital

signals; AES and SDI. These LEDs function whether or not either of

the digital signals is selected for monitoring through the unit.

• AES Signal Error LED: This LED, labeled

AES, glows green

as long as a valid AES/EBU digital datastream is being

received. It glows red to indicate errors. By setting a rear

panel DIP switch, two types of error detection are available:

1) Reception errors: errors in reception of data or no data

stream at all, or

2) Reception and data errors: errors in reception and data

errors identified by the sending device (possibly invalid).