Ive not used the 1126, so couldnt comment on that. Could only imagine it being louder than what i use though.
I have 2 X S112s.
I play in a 6 piece function style band. So a fair bit of volume, although not excessive.
I have a 500W Class D amp, and only ever need to use one cab.
With two, you do get that feeling of "if i want to, i will blow you all out of the water" though, which is always nice
I think the 1126 on its own will be fine, but i suppose it depends how light you play etc