I don’t know if you’re aware, but Falcon Acoustics make a B110, an exact replacement for SP1003, designed by KEF’s original B110 designer. (Also B239 & T27)
The beauty of DIY speakers is that if you have the time the cost of building, and rebuilding )and repeat…) is negligible, si if it doesn’t work how you want it is small loss, and you can try something else.
That’s where I got my B110 units from they are a matched pair. Apparently the guy who originally made them…at Kef now makes them to exactly the same spec… Apparently the Kan drive units were never matched… and when measured are usually miles appart… Exactly…I thought if mine does not work well I can always buy a pair of Falcon cabinets…and have a replica of a Kan…
I am using the Hiquphon tweeter to the same spec…I notice it is possible to get a super selected pair…which are pretty expensive. If my project is successful I might purchase these. Apparantly the Hiquphon tweeter I have is supposed to be very sweet…and detailed…we will see…it all feels very retro…they were used in the original Kan (not the selected pair!)
Precisely - that’s why the BBC specs caused 90% of them to be rejected! Having said that, I suspect the Kans’ “warts” obscured any differences between drivers…
The Kans are great little speakers … I have always loved them … but never owned a set…my brother had a pair…and I built a Kef kit years ago…always enjoyed the B110 mid band…