New Old Stock date code is 0506 meaning they were made in 2005. I haven't had them for that long. They are still in their sealed box.
The Behringer ADA8000 is a state-of-the art 8-channel A/D and D/A converter with 8 built-in IMP microphone preamplifiers. This ultra-compact 19" unit gives you the opportunity to connect analog audio signals directly to a multitrack recorder or similar equipment via the integrated ADAT® interface—and needs only one rack space for this purpose! In return, you can even connect the digital signal of a multitracker via ADAT® to the eight analog line outputs of your ADA8000.
DANALOG DDX3216's performance can be augmented using the ADA8000 option, increasing the number of mic preamps to 20. Signal conversion can be processed at 44.1 or 48 kHz with 24-bit resolution. The ADAT® inputs and outputs can be operated independently as long as there is an identical wordclock signal. The integrated A/D and D/A converters ensure optimal signal conversion without any distortion or signal deterioration.