I am looking into using a gk mb150s w/ ext. cab onstage with a cover classic rock band. The gk mb150s w/ ext. cab is 150watts altogether. Each cab has a 100 watt 8ohm driver. The two 12" drivers should help to increase the volume. Also, i would di to the PA system. So would this setup be enough? Anyone know what the db sensitivity of the speakers in these cabinets are? What about using a power amp to increase the wattage? I am thinking about pursuing this setup as it would be super light and that is very important to me as i dont drive.