2 Dual 6ohm subs wire down to 1.5ohms, your amp is only stable at 2. You could most likely do it, but I would keep an eye on your amp for any overheating. As for actually wiring it you would do this:
Not familiar with Diamond's product lines..my bad.
OP in that case I wouldn't wire it to that amp unless you wire it to 4 ohms, which is most likely a waste of time. Your best bet is finding an amp that can power the 2 properly and is 1 ohm stable.