Well after reading those articles, I think I am going to go in a corner and cry, lol. Really not sure what to do now. What I was getting out of that was putting a pair of bookshelf speakers together horizontally is a no no. Although if you guys think that might be a better route to take let me know.
I do have a wide degree area to cover for people watching the movie, but with that many people we are just watching the movie not getting involved into the movie as much.
What is happening to the KEFs is at higher volumes they are getting distorted, which makes sense for what they actually made to do. They don't like action movies....
So plenty of choices out there, it is looking like a 3-way center of some kind. Should I try and get a JBL even if it is a modern model to work better with the 150s?
First off, you do NOT want to align two speakers horizontally for a center.
Horizontal centers are a compromise compared to a vertical array.
But that said, not all horizontal centers are created equal.
The centers that have their HF & MF drivers vertically aligned are far superior to a straight MTM.
That is why I suggested the EC35.
The best of the JBL centers are the LC2 and PC600. As the L150A has an Al tweeter, and the LC2, PC600 have Ti tweeters they should be a fairly close match. Also, you could replace the 044 tweeters in the L150A with the newer 052Ti, the JBL recommended replacement tweeter for many older JBL tweeters.