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Impedance, 2/8 ohms per speaker

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=22921
Printed Date: May 13, 2024 at 3:44 PM


Topic: Impedance, 2/8 ohms per speaker

Posted By: bullard2003
Subject: Impedance, 2/8 ohms per speaker
Date Posted: December 16, 2003 at 4:26 PM

OK, I have 2 Pioneer dual voice coil subs. I am wondering how many ohms that would be if I wired them in paralell. What about series? It says 2/8 ohms per speaker, so that would be 4 ohms per voice coil, right? The calculator doesn`t support dual voice coil very well. Any help would be appreciated!



Replies:

Posted By: EzekialPhoenix
Date Posted: December 16, 2003 at 4:51 PM
I am not sure what 2/8 ohms means, but if you are right and each sub is a dual 4 ohm voice coil sub, then if you wire them in parallel they will be at 1 ohm, and if you wire in series they will be at 16 ohms, and if you wire in series/parallel or parallel/series they will be at 4 ohms. 

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I be tossin and flossin, my style is awesome. Causin' more family feuds than Richard Dawson.




Posted By: bullard2003
Date Posted: December 16, 2003 at 9:50 PM
OK, so I know how to wire in a paralell OR a series, but how do I do both (to achieve 4 ohms)?




Posted By: eargasm
Date Posted: December 17, 2003 at 1:05 AM

what 2/8 is saying is that, because the sub has 2 voice coils, it can be wired to be either 2 ohms or 8 ohms. can tell it is dual v/c because the sub will have 2 pairs of terminals.

two 4 ohm voice coils in series is 8 ohms.

two 4 ohm voice coils in parallel is 2 ohms.

soooo. wire the voice coils on the subs in series, ie ______+ vcoil1  -____+ vcoil2 -______

and then the two "eight ohm" subs in parallel to give an end result of 4 ohms to the amp.



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2001 Ford Fairmont
Alpine DVD, screen,
5.1surround processor,
5ch Class-T amp, TV tuner
and centre channel.
Focal 3way Utopia splits.
VDO navigation. Stinger cap.
Soundstream Exact subs.




Posted By: tuneman
Date Posted: December 17, 2003 at 2:03 AM

When the specs say they are 2/8 ohms, this means that each voice coil rests at 4 ohms. Wiring the one woofer in series will give you 8 ohms, wiring the one woofer in parallel will give you 2 ohms.

You can either wire them both  series and get 8 ohms stereo and them parallel them to get 4 ohms mono. orrrr

You can wire them each in parallel to get 2 ohms stereo (which most any amp will play nicely at) and then series the two woofes at the amp to give 4 ohms mono.



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