I have a Carvin MB15 with a 15" ext cab. Each weighs about 30 lbs and with the combo and cab has 250 watts. I have only used it playing with very loud friends using PA support includind miked drums and the Carvin had no problem being heard at less than half volume. Plus it has a line out if you want to go into the mix. I would see no problem using most modern combos on a gig these days, especially if you have
the option of mixing in the PA.
the option of mixing in the PA.