I bought a 76 SFDR recently (other than having its speaker swapped out it had never been touched internally ... I recapped it, and its very lively now), and it came with a higher efficiency legend speaker in it. I'm looking for an outstanding low efficiency speaker for the amp that will tame just a bit of the highs, but still have tight bass. I primarily play blues, rockabilly, and surf, but I still need it to twang. The Legend doesn't sound bad (I actually have a legend 10" in another amp, and like it, but it is efficient), but the amp is louder than I want with it in it, and one of the reason I got this amp was to get that sweet spot at a bit lower volumes. I'm tempted to try a mess of 8ohm organ speakers (if I can find them), but I'm sure someone here has had the same dilemma, and can steer me in the right direction for my search. I'm also looking for a low efficiency 10" speaker that will retain the power of the legend's bass response for another amp. I'm thinking some of the Jensen speakers are pretty low efficiency, but I don't know if they will hold the tone I want or have the bass response. The local store here has the ability to allow me to try out anything Eminence makes, but they don't have much in the way of other speakers.