Redesigning the Calpamos with digital crossovers and a new woofer

Thanks Ill look into the thread, this could be another option for upgrade. I haven't come across the concept in which the baffle can be used as a waveguide.

But if the baffle need to be reshaped than it will be difficult option. In any case, I think its a great concept for me to learn more about.
 
EMS speakers do that fine but are expensive and made by hand (France) and for a long time speacialist of Full Range Speakers (Fertin). Their 12" is awesome here and certainly one of the best 12" FR in this world, I dunno for their 15" !
 
The 6" is a direct radiator without horn and the directivity of the lower region is mitigated by adequate baffle width choice, because loudspeaker baffles/boxes acts as waveguides.
Loudspeaker Enclosures are Waveguides

While we are on the topic of lobing you might be able to help me out with another project. I am making a centre speaker and want to put the tweeter in a waveguide. I would like to put the 4inch as close as possible to the tweeter(there above each other) but with this waveguide it seems the centre to centre distance will be maximum 18cm to what it could be of 12cm. The waveguide is aluminium so I can't chip it off, the Monocar waveguide is possible to route as it is plastic but it doesn't seem like a perfect fit for the Scanspeak D2608/913000.

Anyway do you think that the 18cm centre to centre distance would be a problem?