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Conference hips::uk_audioo

Title:	You get surface noise in real life too
Notice:	Let's be conformist
Moderator:	GOVT02::BARKER

Created:	Thu Jul 28 1988
Last Modified:	Mon Jun 02 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	550
Total number of notes:	3847

38.0. "Home built enclosure" by TRUCKS::WINWOOD (Now appearing at the Solent office) Wed Aug 31 1988 14:46

    Does anyone know the formula or relationship between a speaker's
    free air resonance and the volume of box required to dampen it?
    
    I am investigating how to build a pair of irregularly shaped
    enclosures and if someone could tell me how to cater for a speaker
    with a resonance (F0) of 43 Hz I would be grateful.
          
    Here's hoping!
    
    Calvin

T.R	Title	User	Personal Name	Date	Lines
38.1	Electronics (The Maplin mag) has it	BOOTIS::CARPENTER		`Wed Aug 31 1988 15:54`	7
	In one of the Maplin magazines last year there was an article on building your own speakers and they gave almost every equation known to speaker twiddlers. I've got the issue somewhere and I'll try to look it out tonight and give you a reply tomorrow. Steve.
38.2	Slightly less complex than the theory of relativity	CERES::CARPENTER		`Thu Sep 01 1988 12:47`	18
	The equation you want is F3 = sqrt(Vas * Fs * Fs / Vb) Where F3 is the -3dB cuf-off point Vas is the eqivalent air load (a drive unit parameter) Fs is the free air resonance Vb is the speaker cabinet volume I have photocopied the whole article, which goes into great depth, so could you give me a mail-stop to send it to. Steve.
38.3	Need a computer now for calculation!	TRUCKS::WINWOOD	Now appearing at the Solent office	`Thu Sep 01 1988 14:59`	7
	Thanks a lot, and so prompt! My mailstop is SBP F3/0 1. I am in CSS, Solent Business Park, Fareham. Thanks again, Calvin