This is true and why ?those in the know? quit micro polishing intake manifolds decades ago and began adding reversion ?lips? or other means of providing the right amount of back pressure to ?time? exhaust systems due the extreme difference in the SoS of each sub system; but sound is AC, so we?re dealing with a vibrating air mass ?plug? [piston] that in a horn is also expanding/contracting under pressure at the SoS. Consequently, any airflow impediments affect its sound quality [factor], though whether within or outside our acute hearing BW there?s much dispute as to which, and how much, distortion is required to become an issue.
All that said, there is a point where what you?re referring to comes into play in that when the expansion in WLs has ?shrunk? in size to approximately 1 WL of the horn?s expansion it begins to narrow up [beam], so it?s necessary to increase the expansion enough to keep it from happening [mouth end correction] unless the horn is only going to be used below this point.
I?ve always taken the racer?s view that ?God? is in the details, so while no single one may seem to make a difference, a whole bunch of them might add up to something and smoothing out a horn?s surface is easy/cheap enough and looks nice to boot.
GM
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OK, was there a question we missed?
Cool! Looking good! Much nicer woodworking/attention to detail than mine too. Now if there was only a way to make those flares cheaply without having to get them from China???..
Go into your ?settings? listed at the top of the page, then scroll down and click on ?miscellaneous/attachments? to bring up the list, then check off /delete as desired.
GM
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