Drivers and their enclosures |
Post Reply | Page <12 |
Author | ||
odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5483 |
Post Options
Thanks(0)
|
|
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. |
||
George1234
Registered User Joined: 16 January 2017 Status: Offline Points: 19 |
Post Options
Thanks(0)
|
|
In terms of parameters, surely the designs for a full scale rig can be scaled down to suit any size of driver?
|
||
DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1647 |
Post Options
Thanks(0)
|
|
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.
|
||
George1234
Registered User Joined: 16 January 2017 Status: Offline Points: 19 |
Post Options
Thanks(0)
|
|
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?
|
||
odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5483 |
Post Options
Thanks(0)
|
|
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.
|
||
fat_brstd
Old Croc Joined: 23 August 2008 Location: Melbourne, OZ Status: Offline Points: 2125 |
Post Options
Thanks(0)
|
|
This one? - https://en.wikibooks.org/wiki/Acoustics/Fundamentals_of_Acoustics |
||
Melbournes Rootical Warrior Roots - Dub - Steppers facebook page |
||
DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1647 |
Post Options
Thanks(0)
|
|
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 |
||
DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1647 |
Post Options
Thanks(0)
|
|
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 |
||
odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5483 |
Post Options
Thanks(0)
|
|
Yeah, that's the badboy. Good shout on the loudspeaker cookbook too, that's a little more digestible without spending hours.
|
||
George1234
Registered User Joined: 16 January 2017 Status: Offline Points: 19 |
Post Options
Thanks(0)
|
|
Safe!
Cheers for the help - I'll keep everything posted, and ask for help accordingly! |
||
Post Reply | Page <12 |
Tweet |
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |