| Backhorns [message #19989] |
Fri, 07 May 2004 09:08  |
Bradford
Messages: 6
Registered: May 2009
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Esquire |
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Are backhorns actually horns or are they more of a tapered transmission line? The reason I ask is that I can't figure out why some say backhorns are more efficient and others say no. Seems like the backhorn would add bass but nothing beyond, so it is like a tapered pipe. Your thoughts?
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| Re: Backhorns [message #19990 is a reply to message #19989] |
Fri, 07 May 2004 09:37  |
roncla
Messages: 125
Registered: May 2009
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Master |
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Well a back horn works on several principals. The first being the changing of pressure to amplitude ,which a TL dosent do.A backhorn is , in essence, a 1/2 wave resonator that has to be 1/4 wave minimum length.The higher efficency comes back from the flare rate , a very tight flare, ex. hyperbolic, can have up to a 70% conversion from electrical energy to mechanical. A conical will be quite a bit lower.However the tighter flare will increase distortion.The main factor in a horn is its ability to cover 3-4 octaves in gain, where a BR would cover around 1/2 octave, as well as the perception of "speed".You add to this the TL action and you get superior (in some designs) results.
Its all in what you really want.I switched from TLs and TQWT (kinda TL,BR,horn action)simply due to the extreem dynamics and reality of the sound.
ron
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| Re: Backhorns [message #19992 is a reply to message #19991] |
Fri, 07 May 2004 19:39 |
roncla
Messages: 125
Registered: May 2009
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Master |
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Not really, a BR TL,sealed enclosure is around 5% or < efficent.In my horn designs i go for around a 300 Hz roll off from the horn mouth and the baffle simulates a 300 hz OB so the baffle picks it up at that point.I also try to design a flared mouth that tapers into the baffle so there is less mechanical crossover.Its best to even have the driver in the mouth, but i havent found a realistic way to accomplish that .......yet!!!!LOL
ron
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