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Message: <blockquote data-quote="Ollie" data-source="post: 575962" data-attributes="member: 5583"><p>I have to admit, haven`t read the entire thread. So if I repeat something that has been said just tell me.</p><p></p><p>I have measured a great deal of speakers and cabinets over the years and tried to match theory, simulation, prediction and actual measurements. Since we are talking soundwaves, airpressure/wavefront, propagation and ways to interfere with the variables we have a musical instrument.</p><p></p><p>So here are my 2cents:</p><p>Laquer can have a huge effect on dampening albeit on a very narrow band or two or three. A saxophon is a huge Helmholtz-resonator. </p><p>Much of the sound acutally propagates out through the brass. It does so through 5cm of MDF cabinet too. I suspect that our skulls, nasal cavities, chest do radiate some of the sound too. Some materials speed up the speed of sound, some slow it down. Brass speeds it up, changing the frequency at the same time. Above a certain yield you get chaotic behavior of membrane. The sax cone turns into a giant speaker cone. Once we have established that the sax is a giant speaker cone and horn - Then we can simulate it with rough parameters: </p><p></p><p>Alto:</p><p>Chestvolume: 20l (We use this as closed chamber variable 3-30l wont make a difference, think lungvolume and then some)</p><p>Horntype: Conical</p><p>Hornlength 79cm</p><p>Hornmouth 30cm2</p><p>Hornstart 1cm2</p><p></p><p>We get a functioning compression Horn with an average 100db per watt input over a range of 200hz to 5500hz. </p><p></p><p>The curve is very wavy. Don`t worry this is not a sign of a bad design or a flaw. This is just a static load put on the horn, we automatically blow a bit harder or a bit less - depending on which frequency we are. Also I dit no measure the shortening of the horn but in its whole lenght only. Our effort is to approximate the ideal flat output. Some of us probably can do  this extremely well.</p><p></p><p>We have high impedance (resistance) @220, 550 and 800hz. 200hz and below resistance drops to almost 0. That means we have to blow really hard to make a sound. That is why horns do not sound very dynamic in the lower frequencies. We just dont have the airvolume to counter the non resistance, maybe a compressor would help...</p><p></p><p>The horns fs is around 200hz. Everything we play below this fs is well beyond the design parameters of an Alto saxophon. But we do anyway.</p><p></p><p>Does somebody have some webspace to post the diagram?</p></blockquote><p></p>

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