I picked up a Rumble15 because I wanted a really small and cheap practice amp that I could travel with. It’s not bad as is, but I started thinking about making it better. I may at some point remove the amp and just use it as a small cab to be used with something like the Ampeg PF 20 tube amp. For now I just want to upgrade the speaker. I came up with 3 that I’m interested in. Please see the links below. Based on the specks, I like the Dayton. It has less power capability and sensitivity, but it has a lower frequency response, can be used in a smaller box, and has a higher Xmax. I was wondering if folks with speaker cab builds and upgrades would be kind enough to lend their expertise and let me know what you think. I,m looking for a clean and low bass sound. Thanks Fender Rumble 15 1x8" 15-Watt Bass Combo "Dayton Audio DS215-8 8" Designer Series Woofer Speaker" from www.parts-express.com! "Eminence Alpha-8A 8" PA Driver" from www.parts-express.com! "FaitalPRO 8FE200 8" Professional Midbass 8 Ohm" from www.parts-express.com!