RE: Re: whole house audio

["John Hill" <jhill1@xxxxxxx>]

Title: RE: [ukha_d] Re: whole house audio

You DON'T have to work in pairs for calculating the net values.
1/x=(1/a)+(1/b)+(1/c) etc where a,b,c etc are the values & x is the result. Answer is the inversion of x; ie
(1/8)+(1/16)+(1/8)=1/0.3125 which gives 3.2
(dead easy to do!)
Keith's suggestion is best when you only have a small number of values to deal with.

John

-----Original Message-----
From: Keith Doxey [mailto:ukha@xxxxxxx]
Sent: 16 November 2001 13:05
To: ukha_d@xxxxxxx
Subject: [ukha_d] Re: whole house audio

Hi Scott.

For mismatched speakers use the following formula where a & b are the
speakers.

(a*b)/(a+b)

eg speaker a = 16 ohm, speaker b = 8 ohm

= (16*8)/(16+8) = 128/24 = 5.333 ohms.

You HAVE to work them out as pairs. The formula wont work with more
than that. for example, 3 x 16 ohm in parallel (because thay are all
the same just divide by number of speakers) = 5.333.

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