Thanks. I might try it in a Pi One-style cab and see how it sounds. I still have a pair under construction. It's hard to tell how similar the 2118 is to the 2115 because the specs are from different eras! The 2115 specs I found were prior to T-S became common. Looking on the www, it seems these are very popular in car audio. I might try it with a guitar amp. I'll keep an eye out for another one, in the meantime.