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I have a couple of queries relating to the transition from the mouth of the S2 driver to a horn generally, and to a 400Hz or 250Hz horn specifically. 

The profile calculator that I use for tractrix horn (horncalc) does not take into account the depth of the diaphragm of the S2 from the mouth.

I have worked out that at the base of what looks like the conical horn section the diameter is approx 30mm. With a mouth diameter of 38.1mm, the angle is therefore a constant 2.5 degrees. The flare angle at the beginning is a relatively large 6.3 degrees. With a 247Hz horn that angle would be 5 degrees.

Should this be of any concern?

I know that Jean Michel Lecleach's spreadsheet (I have a version from 2007) actually enables one to specify an exit angle. I imagine that one's answer might in part depend on how critical one conceives the transition at the throat.

Best regards
Rakesh

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