Specifications

Options and Enhancements
AD1000 UV22 Digital Through Option
The UV22 digital through option gives the AD-1000 the ability to process digital input signals with Apogee’s
award-winning UV22 encoding technique, which preserves the audio quality of 20-bit signals in a 16-bit envi-
ronment. (The standard AD-1000 includes UV22 encoding, but only on analog input signals. Digital signals may
be format-converted but not encoded in the standard model.) This option allows a studio to work entirely at
20-bit resolution and then run the completed project through the AD-1000 to apply UV22 encoding down to
16-bits.
Operation:
1. Connect your digital audio source to the AD-1000 to the top BNC port on the back of the AD-1000 for
AES/EBU* or S/PDIF operation. Optical input is available via the TosLink connector on the back of the AD-1000.
* NOTE: A special cable (Apogee part # WE-BX-0.5FT) is required to interface an AES/EBU XLR cable to the
BNC port.
2. Set the INPUT SELECTOR to the DIG position.
3. Set the SYNC SOURCE to 110Ω AES, S/PDIF, or OPT. (depending on type of digital audio source.)
NOTES:
• S/PDIF must be terminated with 75 Ω by selecting the DIP switch 1 to ON (located on top of the AD-1000).
Alternatively, a 75 Ω BNC termination (supplied with the AD-1000) can be connected to the unused BNC
connector. Termination is not necessary if looping to another device, as the last device in the chain is then
terminated.
• Two AES positions are available. The position labeled 110 Ω AES terminates the input with a 110 Ω imped-
ance. The AES position with the ^ above it signifies a bridged input of 5 kΩ for the AES. This position would
be used if the AD-1000 was not the last device in the chain.
4. Set SAMPLE RATE to the 6 o’clock (unmarked) position.
5. Set the THREE POSITION SWITCH (located between the Sync Source and Sample Rate selectors) to either
16, UV16 or 20 as desired.
When inputting a 20 bit signal:
• the 20 position outputs 20 bits with no processing.
• the UV16 position outputs 16 bits with UV22 encoding.
• the 16 position outputs 16 bits with triangular dither.
When inputting a 16 bit signal:
• the 20 position outputs 16 bits unprocessed (whatever signal is input).
• the UV16 position outputs 16 bits with UV22 encoding.
• the 16 position output 16 bits with triangular dither.
6. NORM / ADAT Switch:
Selecting ADAT transmits the ADAT output on the Optical digital output.
When NORM is selected, the AD-1000 simultaneously outputs AES/EBU (Male XLR) and S/PDIF in optical and
coaxial formats.
AD-1000 Operating Manual
Page 35