Rear Panel - Apogee AD-8000 Operating Manual

button is used to select S/PDIF as SOURCE. Likewise when the S/PDIF SYNC SOURCE LED is lit while the
AES/EBU SYNC SOURCE LED is blinking then AES/EBU may be selected as SYNC SOURCE if the SOURCE but-
ton is used to select AES/EBU as SOURCE.
Blinking SOURCE LED
When a SOURCE LED is lit while another is blinking then the blinking SOURCE LED may be selected as
Source if the SYNC SOURCE button is used to select an appropriate SYNC SOURCE.
For example:
Starting with CRYSTAL selected as SYNC SOURCE and AES/EBU selected as SOURCE, press the SYNC
SOURCE button two times to select AES/EBU as SYNC SOURCE. Press the SOURCE button once. The
AES/EBU SOURCE LED will remain lit while the S/PDIF SOURCE LED blinks. This condition indicates that
S/PDIF may be selected as SOURCE if the SYNC SOURCE button is used to select S/PDIF as SYNC SOURCE.
Likewise when the S/PDIF SOURCE LED is lit while the AES/EBU SOURCE LED is blinking then AES/EBU may
be selected as SOURCE if the SYNC SOURCE button is used to select AES/EBU as SYNC SOURCE.

Rear Panel

The rear panel includes the following input and output connectors and switches:
Aux Control
This 10-position DIP switch controls a series of internal settings. If you change any DIP switch settings, do so
with the unit powered down to ensure that the changes are registered.
Note: AD-8000 units leave the factory with all DIP switches in the default (down) position.
DOWN = OFF (Default)
SW1 "Pro" line level (+4 dBu)
SW2 UV22 to 16 bits
SW3/SW4
SW5 UV22 "Normal" setting
SW6 Digital Input DC remove DISABLED
SW7 Analog Input DC remove DISABLED
SW8 Polarity Pin 2 hot
SW9 Truncation Logic ENABLED*
SW10 Autosync ENABLED
Over Detection Threshold
The over detection threshold is the number of consecutive full-scale samples that constitutes a digital
"over". The Over indicator will increment when the threshold is reached. To avoid rapid saturation of the
counter, the DSP "times out" for one second after detecting an over, before detection is re-enabled.
SW3 SW4
ON ON
ON OFF
OFF ON
OFF OFF
*Truncation Logic is applied only to digital inputs such as AES/EBU and S/PDIF, which carry internal data about the sample length.
If an input is applied which, for example, identifies itself as "16-bit", then the truncation logic will discard any additional bits in
case they contain undefined data. If you are handling a signal in which the LSBs are used for some other purpose, however, and
wish to preserve them, you can turn the truncation logic off to ensure that the data is passed unchanged.
†SW7 is set to OFF (down) when the AD-8000 leaves the factory. In this default position, DC components are not removed from
incoming analog signals. The "over" threshold setting defaults to four consecutive full-scale samples. If you wish to remove DC
from analog signals, we recommend that you set the "over" threshold to one sample, ie set DIP switches 3 and 4 ON (up). If you
attempt to perform DC removal on analog input signals with the threshold set to a higher value, some overs may go unregis-
tered, because the DC removal circuitry interprets any analog clipping longer than a single full-scale sample as a DC component,
and consequently removes it before it can be registered as an over, if the over threshold is set to more than one sample.
AES Outputs
Connectors: Male XLR connectors (4)
Function: Transmits AES data from A/D converters or digital inputs—each carries two channels
AD-8000 Operating Manual
Over detection threshold (see below)
Threshold
1
2
3
4
UP = ON
"Consumer" line level (–10dBV)
UV22 to 20 bits
UV22 "Low" setting
Digital Input DC remove ENABLED
Analog Input DC remove ENABLED†
Polarity Pin 3 hot
Truncation Logic DISABLED*
Autosync DISABLED
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