While talking about microphones sure is fun (I have an ECM-8000 lying around that appears to be pretty straight out of the box and I read somewhere that Dayton offers lousy cal files) the original question was about speaker design. And since the TS seems to live around my place, I‘d just want to point at Boxsim. It’s relatively easy and comes with quite good measurement data of all Visaton units plus a tool for simulating radiation from enclosures of your choice (as long as they are rectangular). I could think of three quite good Visaton drivers that would bring such a project to a successful end:
TIW250 XS, AL130 (M) and KE25SC for a tad pricey system or SC10N, W130S and W250S for a budget one.
TIW250 XS, AL130 (M) and KE25SC for a tad pricey system or SC10N, W130S and W250S for a budget one.
Using 4 ohm drivers doesn't mean you have to have an impedance that drops to 2 ohms or less.
It is all about the crossover design - and specifically its reactance.
PS.
2 ohms would not upset my amplifier in the slightest.
I was just going by the graph supplied, I have no expertise in the art/science of circuitry. I have an old Yamaha which would croak if given a 4 ohm load!
Geoff
Geoff