Haven't tried the weber. I've had a few eminences, a JBL K140, and CTS (stock and recones) in my B15Ns. The single baffle I had was complete with its stock CTS. My double baffle came to me with the K140, I tried some eminence, and finally settled on the reconed CTS. The aluminum cap JBL was a bit honky in that cab IMO, the CTS and eminence were smoother. If I was building a new cab I'd probably go for an eminence beta, but not having heard a D140 I can't really comment on the weber. Best of luck to you.