Need help from other George Wright amp owners -

I just purchased a set of AU 70 amps and have one simple question. Under the binding posts are jumpers that allow for 4, 8 and 16 ohm settings? At least I think so as they are not marked. Can someone confirm?

Ok, now which setting is which as they are not marked. There are 4 screws lined up side by side in a row. I can connect 1 and 2 or 2 and 3 or 3 and 4.
Not sure in looking from the back which is 4,8, or 16 ohm? The screws are not marked and I just mention 1,2 etc for clarity.

Can someone help me.

Thanks much