Okay... I need to replace two blown speakers in my Randall R412CXM. Here is a wiring diagram of how it was setup when I opened the cab. The two left speakers are the ones that blew, I've already removed them. They have the easy pull-off tab things.

1) Does this diagram look correct? Is there anything wrong in here that would cause the speakers to blow?

2) Should I replace them with two more Celestion Seventy 80s or should I go with a different brand for a little change in sound. Of course my new speakers would be 8ohm and rated for 80 watts just like the Seventy 80s, but maybe run the new ones on the bottom two positions and the Seventy 80s on the top two positions? Any recommendations or suggestions?