I think you would use the line-out of the A5 to connect to the sub. Assuming that line-out has variable volume (which it may or may not), the volume control would be from the speaker control. You'd probably be ok with an EP125 in that room, but there are very few people around here who have an EP125 or have even heard one, sorry to say.

Edited by Ken.C (01/10/13 01:37 PM)
I am the Doctor, and THIS... is my SPOON!