High Efficiency Speaker Asylum

RE: is it ok to examine some BLH horn by converting to FLH?

75.109.11.25

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hey Paul - here's a real BLH built by "awhite" over at the fullrange forum using Fostex 225K. IIRC throat area is around 8 sq.in.

I asked the builder to put a sealed chamber over the front - he took a graph and I mucked with it a bit adding his plans to show the horn's folds

here's what he came up with FOR RESPONSE

some BLH-horn-designers insist upon smooth curved surfaces while others might take an approach ~like Olson's 1937 patent.

questions - whats important in making good and good sounding BLH? how far up must the rear wave show "gain" and how does baffle-step and what can be expected of the rear wave's contribution and summation(s)
in real world horns?

imo that graph is cool - seems like method I suggested would pretty well separate the rear-wave performance and beamwidth with a few traces - whadya think?

Freddy

Edits: 07/17/07

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