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In the Forum: Horn-Loaded Speakers
In the Thread: This new midbass horn dilemma

Post Subject: Additional measurements and thoughtsPosted by noviygera on: 2/6/2014

Romy,

Thank you for your response. I am trying to figure out this horns and I did additional measurements. The phase plug is an interesting part of forming of the the horn throat expansion and because it is quite big and so looks like it is also a "throat area adjustment" for the rectangular horn flare. Maybe it also reduces the parallel surfaces interaction in the throat area.

After some additional measurements the actual throat opening area is 52.5 inches sq. I took the area of rectangular throat at its smallest cross-section(13x5) and subtracted the phase plug area at that point (4 diameter). This gives the 52.5 sq. inch area of throat. Cone area is 122 sq. inch

This calculates (if I am correct) to compression of 1:2.3

I will continue to experiment with this midbass and one thing that came to mind is that it was designed to be used in multiples, lets say, TWO pairs. this will provide the doubling of mouth area as you mentioned, that was needed for a 90Hz horn. I will put them together (stack the pair) and see what happens.

One question to your response. You mentioned the resonance of 80Hz is too low for this horn and to raise it to 110. What benefits does this usually bring, this equalization of resonance to horn cutoff?

Regards, Gera

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