When I got back into bass playing again, I rebuilt my rig with two 1x15's (a Mesa Diesel and an SWR WM). It was boomy and bassy, but seemed to lack the clarity I wanted. Great compatibility between the two cabs though. I used an ampeg 4x10 setup for gigging long ago and was never too crazy about it. It could barely get the job done in most places. Later on, I decided to try out adding an Avatar 2x10. It added some clarity and throw and reduced the wide boom. After a while I added in a compressor and a Sansamp and with decently new strings, I can cut through through pretty well using either configuration. I've gigged with both setups. All in all I thought the 2x15 setup was more fun because it had a huge presence and probably moved a lot more air, but the sound was still a bit loose. Since my guitarists dont use huge stacks with massive low-end, the extra bass from the 2x15 has been a good match. With all due respect to GAS, I am considering trying out a 2x12/1x15 setup. Has anyone done this? Would it be the best of both worlds?