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Wiring up Speaker Cabinets

 

Wiring up Cabinets ( Impedence )



In multi-way systems with several speakers in a cabinet using a passive cross-over, it's important that each seperate section/bandwidth....Bass, Mid, treble, should present the same impedence.

For example.....In a system of 8 OHMS total impedence, it is important that each section, Bass - Mid - Treble, should individualy have an impedence of 8 OHMS.

So, if each or any individual section has more than one speaker unit, then they must be wired to present 8 OHMS...........so, for example, if you had an 8 OHM per channel amp, delivering to a cabinet with 1 bass speaker, and 2 mid speakers, and a treble speaker with a passive cross-over, then the midrange speakers need to be 4 OHMS each and should be wired in series, creating a total together of 8 OHMS........

The exception to this rule is with Tweeters operating at above 3kHz.......At frequencies above 3 kHz, the treble units can present a Higher, but NEVER Lower impedence than the other sections......

The effect of a higher Treble impedence, is a Decrease in sound output level, but an Increase in power handling capability, proportional to the mis-match ratio........

So, if a 16 OHM Tweeter is fitted in an 8 OHM system, the power handling capability of the Treble Section would be increased by a factor of 2





http://www.dancetech.com/img/SERIES.gif 


http://www.dancetech.com/img/PARALLEL.gif 



For combined Series / Parallel, calculate the impedence of each cluster of speakers, and treat that as if it were a single speaker with a single impedence. then calculate the total combined impedence using this formulae: 

Z = IMPEDENCE IN OHMS
 



http://www.dancetech.com/img/series-parra.gif 


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