[quote name='Buzz' post='827846' date='May 4 2010, 08:24 PM']Hi, read this thread:
[url="http://basschat.co.uk/index.php?showtopic=135"]http://basschat.co.uk/index.php?showtopic=135[/url]
It's the big bumper thread about impedance and wattage in relation to amps and speakers. The basschat wiki articles are very good as well.
Basically, if both cabs are 8 ohms (total load will be 4 ohms), whatever power your amp puts out at 4ohms will be split equally between the two. The wattage rating on speakers is only to do with their maximum handling capacity and not how loud they are really. So, if you've got an amp which puts out 500w at 4ohms, each will get 250w. All you need to do is make sure the cabs will handle that*.
[sub]*Not strictly true, but good enough general rule[/sub][/quote]
Cheers my mate,it helps