ESDL3 Speed AV input

Hi all
Can you confirm my understanding...the "Speed" input on an ESDL3 can alternatively be used as "AV" inputs?
If so, any disadvantage to using them this way?
Thanks in advance
Can you confirm my understanding...the "Speed" input on an ESDL3 can alternatively be used as "AV" inputs?
If so, any disadvantage to using them this way?
Thanks in advance