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Parallel 4 ohm and 8 ohm?

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=54162
Printed Date: May 11, 2025 at 8:49 PM


Topic: Parallel 4 ohm and 8 ohm?

Posted By: tmorefi
Subject: Parallel 4 ohm and 8 ohm?
Date Posted: April 18, 2005 at 2:31 PM

Can you parallel a 4 ohm speaker with an 8 ohm speaker? What would be the impedance? 5 ohm?? Thanks.



Replies:

Posted By: mikew04
Date Posted: April 18, 2005 at 2:36 PM
It would be at 2.6ohms. It will work if your amplifier can handle the load.

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Posted By: DYohn
Date Posted: April 18, 2005 at 2:43 PM
And realize that the 4 ohm speaker will receive twice the current flow as the 8 ohm speaker.

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Posted By: ravenndude
Date Posted: April 18, 2005 at 2:45 PM
It would be a 2.667 ohm load.

1/4 + 1/8 = 1/r
2/8 + 1/8 = 1/r
3/8 = 1/r
8/3 = r

r = 2.667

or use this

I don't know how that would sound though and how the power would distribute between the two (that's a little too advanced for me).

Are you trying to mix home audio with car? Or do you have a mid that's 4ohms and a tweeter that's 8ohms?

wow ... two people posted before i could type this.



Posted By: tmorefi
Date Posted: April 18, 2005 at 2:46 PM
Oh perfect. So another question. If my amp (Orion 8004) is rated at 100 x 4 at 4 ohms and 200 x 4 at 2 ohms, do you know what it would do at 2.6 ohms? About 175 x 4?? Thanks again.



Posted By: DYohn
Date Posted: April 18, 2005 at 2:48 PM
The 4 ohm speaker will produce twice the power of the 8 ohm speaker.  It is not a good idea to do this except in special installations.

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