i just got a 1010R for $300 and just elated with the sound. I know understand why some people like it and some don't. it definitely has it's own voice. I am using a Superfly that is (2)X250 watts and not bridgeable. In a recent post it was recommended to me to get some new cabs because the (2) Yamaha BBT110s were not cutting it. The 1010R has made a dramatic improvement and I would like to add a second cab for the other power amp. I am looking for something to compliment the 1010R. I noticed that a open B was lacking and looking for some rounder tone on the bottom. I need a 4 ohm cab that is efficient since I believe that the 250 watt rating is somewhat overated in the Superfly. (but I do love the sounds that I get from it!!) I was thinking about a Bag End S15 but have not seen any in 4 ohms. Would a 12" do the job?