Speaker Wiring Impedance Balancing

Neil Cawley

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I thought I understood the basics of speaker wiring, parallel vs series and I was hooking up my speakers, but math is not agreeing with reality. I have two 8 ohm speakers and one 4 ohm. I wired the two 8 ohm speakers in parallel, then tied those to the 4 ohm in series (notice the sign change in the graphic). I expected the total impedance to be 8 ohms, but I measure 2 ohms.

What am I missing?

Speaker wiring.jpg
 

Michael Roe

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From jack positive to "4 ohm" positive.
From 4 ohm negative speaker to 8 ohm positive (middle speaker.
From 8 ohm negative (middle speaker) to jack negative.
 

Neil Cawley

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Thanks for the reply Michael, is the "jack" the hookup to the amp? I am still confused.
 

Neil Cawley

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Ok that graphic popped in as I was answering, I will try that, interesting
 

Dogs of Doom

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Dang you guys are smart! That works, I now have the 8 ohms. Thanks
you've just got to remember, that to have series, you need a loop, as illustrated on the right ½ of my drawing. To be parallel, all +'s are connected together & all -'s together. The loop goes + to -, to + to -

parallel:
+/+/+
-/-/-

series
+/-/+/-

here, you have a mix, of series, w/ 2 of the speakers hooked up parallel.
 

Neil Cawley

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I wanted to close out this thread with the rest of the story. I have a Valvestate S80 (8240) combo and a stereo 412 cab I was putting together. The S80 did not come with speaker out jacks only DI jacks. I used the wiring in this thread and all works good. The combo and cab are wired as a stereo system. Very happy with my new practice amp.

S80 Front.JPG S80 back.JPG
 

shredless

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Now we can discuss sensitivity and how much power each speaker will get
 

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