Drivers and their enclosures |
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George1234
Registered User Joined: 16 January 2017 Status: Offline Points: 19 |
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Posted: 19 January 2017 at 1:32pm |
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Safe!
Cheers for the help - I'll keep everything posted, and ask for help accordingly! |
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odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5482 |
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Yeah, that's the badboy. Good shout on the loudspeaker cookbook too, that's a little more digestible without spending hours.
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Online Points: 1649 |
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Little bit bigger than that I think: https://www.amazon.co.uk/Acoustics-Leo-L-Beranek/dp/088318494X Edit: un-buggered quotes
Edited by DMorison - 20 January 2017 at 2:00pm |
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Online Points: 1649 |
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As odc04r says, Beranek is a
benchmark for those with the math skills to follow it, unfortunately that does
not include Me. This is much more basic, and a little dated, but
very easy to digest: https://www.amazon.co.uk/Introduction-Loudspeakers-Enclosure-Design-BP/dp/0859342018 Vance Dickason's "Loudspeaker Design
Cookbook" (on about its 73rd edition by now I think) would be a little more
intermediate, but doesn't cover Horns. For more specific stuff about horns design, you
might try some of the articles here: http://www.quarter-wave.com/Horns/Horn_Theory.html or
this one: https://www.grc.com/acoustics/an-introduction-to-horn-theory.pdf HTH, David. Edit - correct attribution /
spelling Edited by DMorison - 19 January 2017 at 12:52pm |
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fat_brstd
Old Croc Joined: 23 August 2008 Location: Melbourne, OZ Status: Offline Points: 2126 |
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This one? - https://en.wikibooks.org/wiki/Acoustics/Fundamentals_of_Acoustics |
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odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5482 |
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If you really want to learn fundamentals your best bet is to buy some second hand textbooks and read 'em! The internet is a great resource but sometimes nothing beats an actual book. If you are good enough at maths to understand complex numbers then get 'The fundamentals of acoustics' by Berenak. Otherwise look for something a little less technical.
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George1234
Registered User Joined: 16 January 2017 Status: Offline Points: 19 |
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Ah okay, Im very interested in all of this - having only started looking to what actually goes into a speaker, I dont know what these fundamentals are, can you help?
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Online Points: 1649 |
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Not in all cases, no. Some of the ways in which cabinet design features affect the sound are based on the wavelength of the sounds you want to reproduce, as well as the drivers used - horns in particular are very dependant on wavelength related principles. So if you want a horn to go down to 40Hz, it has to have a minimum path length and mouth area, regardless of whether you put a 5" hifi driver at the start of it or a 21" PA sub. (There are slight exceptions based on sub-types of horns etc (eg tapped horns are less dependant on mouth area) and acoustic environment, but you don't want to start learning to design by relying on exceptions, you're better to learn the fundamentals first.) HTH, David.
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George1234
Registered User Joined: 16 January 2017 Status: Offline Points: 19 |
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In terms of parameters, surely the designs for a full scale rig can be scaled down to suit any size of driver?
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odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5482 |
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Well the same principles apply, HiFi guys tend to be less about maximum SPL and more into other exotic details of designing enclosures but the fundamentals are the same.
T/S parameters are very useful for modelling a system at small signal levels, where driver and magnetic gap behavior remains linear. They are also most useful for under ~400Hz modelling although can be extended higher if you are more careful. Under there you can generally assume the wavelength of sound is much larger than your cabinet dimensions and so doesn't interact with it much in terms of resonance. They will not predict large signal effects so well necessarily, and they can't really tell you anything about the particular way some drivers sound compared to each others. There is also a statistical distribution of parameters over drivers due to manufacturing tolerances and that parts of them will loosen up slowly over time as they are used. So in summary, they are massively better then nothing at all and allow you to get within 90% of your design goals I'd say. But at some point you need to build a prototype, account for real world effects + adjust, then perhaps build a better mk2 model with what you have learned. |
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George1234
Registered User Joined: 16 January 2017 Status: Offline Points: 19 |
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Thanks very much! So I should start looking at small systems, like a Hifi system to get started with? Is it possible to use 12" drivers or higher? Or does it all depend on the t/s parameters?
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odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5482 |
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Your only hope for a 6" driver and low frequencies is a bandpass or reflex assisted enclosure unfortunately. And it won't be any old 6" driver for decent results. The bandpass might give you some rumble but not much else. Your best bet with a 6" driver is to build a pair of floorstander or bookshelf speakers. Might be a bit more HiFi looking than PA but that's the world that 6" drivers come from generally.
Generally due to the way 6" drivers are made for PA you are going to struggle to get anything lower then 60Hz out of them and the power you cab give will be limited. As long as you realise that then build anything for practice and looks. It's all good woodwork practice. |
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