First off, this is a great set up!
I use to have my Sansamp RBI going into a crown amp, then switch to QSC PLX amp.
You have a couple different of options on how to set it up.
But your question seems geared towards the amp and cab.
You don't have to bridge it, but if you want to, you can use a speaker cable and just buy a banana plug adapter. Use the banana plugs on the 2 red slots while in bridge mode.
That's one way.
Your cab will receive either 300w or 1000w bridged.
GK Club Member #996
GK + Ampeg Club Member #6
Eden Club Member #310