Subhornor bass horns only [message #18149] |
Mon, 26 September 2005 08:04 ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
adavis464
Messages: 64 Registered: May 2009
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Viscount |
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Horn expansion is the volume of the expansion the important part.In other words when shape start to effect the response.I used Mcbean to calculate the expantion of a sub horn using JBL2240 I am limited to 21" in width and let the expansion from there.At what point if I made it lets say 18" would this be worst or no different.Its built Ijust need to make th back chamber and stand.It's 5'by5'21" wide regards Tim
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Re: Subhornor bass horns only [message #18150 is a reply to message #18149] |
Mon, 26 September 2005 12:34 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
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Wayne Parham
Messages: 18757 Registered: January 2001
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Illuminati (33rd Degree) |
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The truth is, when a segment expands with a straight-sided expansion on one side and no expansion on the other, it is really a parabolic expansion, not conical. Conical expansion requires linear expansion in both axis. Exponential or hyperbolic requires even more. But by using several sections, you can approximate the flare you want, even with straight side walls. Also, there will be a notch in output at the frequency where the side wall distance is 1/4 wavelength, so consider this when choosing a crossover frequency. If it's a basshorn, it probably won't be an issue, and may help increase rolloff above the passband.
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