About 6 months ago I purchased a GK MB210 combo amp. I am very pleased with it. It weighs only 33 lbs, which my back loves, and pretty happy with the sound. The amp is 350 watts output, but when you plug an extension cab to the amp, the wattage increases to 500 watts. I am not sure if the extension cabs gets the 150 watt boast or if the amp increases to 500 watts increases wattage to both combo speakers and extension speaker(s) equally. Anyway, GK has two matching cab options that are designed to stack with the MB210. A 1 by 15 or a 2 by 10. I play in a classic rock cover band and would like to use the extension cab for some of our larger venues. I play a Gibson SG and a 92' P-Bass Deluxe Plus for the classic rock stuff. I can not compare the two cabs side by side because their special order so stores do not stock them. I am trying to make an educated guess which cab to order? I am leaning towards the 1 X 15 cause I like the deep sound. Your thoughts please.