sparetomato

I'm in the process of replacing my 15 year old 60 watt Marshall amp with something a little smaller to practice with, yet expandable for gigs. A music shop near me is doing a nice price on Trace 1210's and 1215's. I've always wanted a Trace combo, so am ready to take the plunge. However, I'm curious as to what the actual difference is with the speakers. The 1210 has two 254mm speakers, while the 1215 has a single 382mm speaker. What is the actual difference? Sorry for what is probably a very basic question, I know nothing about amplifiers. Thanks.