[quote name='flyfisher' timestamp='1345214305' post='1775107']
Electrically, it makes no difference if the head has one or two output sockets (unless it's stereo!) as the two sockets are wired in parallel anyway.
With only a single output socket then you'll have to 'daisy-chain' the two cabs, but that's fine.
All the usual rules about ohms and wattage ratings still apply.
[/quote]
+1
The only advantage of using x2 outputs from an amp (scenario A ) instead of daisy-chaining the 2nd cab from the 1st (scenario B ) is that in B if the lead connecting the amp to cab 1 fails then you have no signal (not good mid gig), however in A, you still have one cab functioning if the same lead were to fail to one of the cabs (you could then try and sort the lead between sets or after the gig).
<edited for emoticon faff>