Sek'd sent us the following information in response to questions on the resolutions and sample rates available with their audio cards:

PRODIF24

Resolution: 8 and 16 to 24-bit (16 to 24-bit means either 2 or 3 byte words, so any bit rate between 16 and 24 is supported, e.g. 18, 20, 22, 24)
Sample Rate: 32000 Hz, 44100 Hz, 48000 Hz
Analog Out: 18-bit
The output clock can either be controlled by the card's internal clock rate or by the incoming external clock rate.

ARC44

Resolution: 8 or 16-bit
Sample Rate: 4 kHz to 48 kHz (can be controlled by host program in 1 Hz steps)

ARC88

Analog port:
Resolution: 8 or 16-bit
Sample Rates: 4 kHz to 48 kHz (can be controlled by host program in 1 Hz steps)
Digital port:
Resolution: 8, 16 to 24-bit
Sample Rates: 32000 Hz, 44100 Hz, 48000 Hz
In order to utilize the various resolutions and sample rates, the audio recording/editing software in use must support them.