I usually just try stuff. Not sure if I should this time. Traded into a really sweet '68 SFDR. Came to me with one of the original Alltone 1250s installed. And it does sound really good. A few pre-amp tube changes later, even better. The surprise is, it's noticeably better than the (also excellent) '67 BFDR I had for years. In which I tried many speakers. I just got a deal on an Emi GB128. Have used this speaker in other cabs, combos, and have always enjoyed it. Question is, should I go to the trouble of swapping it in to try in the '68 DR? Has anyone had experience with both speakers in a DR? I'm curious, but not sure I could improve on the Alltone. Thanks much!