[quote name='thebuckets' timestamp='1334186282' post='1612446']
so if i got the combo and the 2x10 could I run all three speakers together as well as 1,2 or 3 and would it give me enough oomph for decent sized pub venues?
[/quote]
From the specs posted by neepheid, it appears that the cabinet is available as 4 Ohm or 8 Ohm. You would need to make sure that you bought the 8 Ohm version if you were going to use it as an extension to the combo - using the 4Ohm in this way will result in an overall load of 2.66 Ohms which may damage the head.
The power arithmetic kind of stacks up since the combo speaker is rated at 250W, but I wouldn't put too much faith in that since things can go wrong before you reach the theoretical power handling limit. Rule of thumb is don't put the bass on "10" and if it starts to fart turn it down. It seems odd to me that a 1x10 and a 2x10 have the same power rating - I'd expect them to use the same drivers in the combo and the 2x10, so the power rating numbers might be bogus.
It seems to me that the biggest factor in the amount of noise you make is the total displacement, so in this case the higher the number of drivers the louder it's going to be. That would give you more oomph, but whether that's enough depends on the loudness of the band, whether you can EQ the right sound in the mix to be heard, the size of the room and the number of punters - we can't guarantee it, you need to suck it and see!