I know this is a very old thread... but I thought I'd chime in on this difference in the internal throats of the 2447 vs 245x drivers.Originally Posted by gibber
Actually, if you ideally add to both drivers the 63mm-long "snout" that the 2450 has to lead to the classic 2" (49mm) exit, you get the following internal flare rates (based on the equivalent exponential expansion): 180Hz for the 2447, and 225Hz for the 245x.
This is interesting, as it appears that the 2447 + "snout" = 2446, which shares the same flare rate with all previous historic 244x drivers back to the original Lansing 375.
Instead, the 245x drivers share a different (newer) design that happens to have the exact same internal flare as the TAD TD-4001 and TD-4002. This can be easily verified by doing the calculations on the removable "snout" of the TD-4002, which is 64.5mm long and goes from a starting diameter of 39mm to an exit diameter of 50.8mm.
I thought this "coincidence" was cool, and decided to post this for future reference.
Cheers,
Marco
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