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I’m a big fan of wide baffles. One of the best the Sonus Faber Stradivari, yes to the Snell A series, and of course, Genesis/Infinity line arrays.
I think the explanation here is BS, as speaker designers are all aware of the baffle step issue and take it into account in the crossover design.
What the final speaker does suffer from as a result of baffle step is reduced efficiency. Speaker designers trade off efficiency for bass response.
In that respect, yes, a wider baffle will yield a more efficient speaker (assuming equal frequency tuning). The real magic of wide-baffle speakers in my opinion is not in the efficiency but in their ability to convey the recorded room acoustics into the listening space.
Paraphrasing Troels Graveson , wide baffle speakers bring the room with them.
Forgot to point out, that the wider the baffle, the more energy is put into the room before edge diffraction occurs.
It is one of several techniques which attempt to deal with this issue. The Snell A series attempted to use a very wide AND curved baffle.
Using a chamfer or rounded edge, foam, felt, etc. also work to reducing this effect.
But for my money, wide baffles do it best.
Peter Snell US Patent 3964571 can also be used as a supplement for room boundary design. His use of angles other than 90's will reduce shear wave interference and its recreation into the compressive world. Peter did a speaker demo at a home of mine back in the early 80's. He was a quiet man and a speaker hero. Tom