Richard - in my collection of stuff I have soundcards and audio interfaces
equipped with 8 In/8 Out ADAT S/PDIF Audio Interface...

Behringer used to do the cheapest acceptable quality 8 analog into 8 digital output converter box.. but i never got round to buying one..

..And Emu did the sub 150 quid adat input sound cards..

All this until about 5 ish