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6 8ohm speakers to 4 ch. amp?

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=48525
Printed Date: July 12, 2025 at 3:16 PM


Topic: 6 8ohm speakers to 4 ch. amp?

Posted By: tmorefi
Subject: 6 8ohm speakers to 4 ch. amp?
Date Posted: January 24, 2005 at 9:11 PM

I want to run 4 8ohm (125 rms) midbass's and 2 8ohm (40 rms) compression horn drivers to my PPI PCX4125 (4x125 rms at 4ohm) amplifier. How can I best wire all of this to this amp? Ideally, I would separate the horns to 2 channels and the mids to the other 2 channels so I can adjust the gains separately.. Any help on the wiring diagram? thanks..



Replies:

Posted By: tmorefi
Date Posted: January 24, 2005 at 9:12 PM
1 mistake. The compression drivers are 100 rms 8 ohm. Thanks.



Posted By: stevdart
Date Posted: January 24, 2005 at 9:34 PM
Parallel wire two mids for the right, and two for the left.  Use channels 1 and 2 of the amp for power output of 2 X 125 Watts.  Connect the horns to 3 and 4, for output of 2 X 62.5 Watts.



Posted By: tmorefi
Date Posted: January 24, 2005 at 10:09 PM
That's what I was thinking but the ohms confused me. If I parallel them, each set of mids will be at 4ohms and the amp only does 125 rms to 4 ohms. Don't I need 250 at 4ohms for eacvh channel?



Posted By: stevdart
Date Posted: January 24, 2005 at 10:38 PM

No, you don't need the output to match the RMS of the woofer.  They'll be heard with only 10 watts.  You'll have 125 watts split to two mids, per channel.  And the horns are 8 ohm, so the amp will output 62 watts to each of them.  Should be a fine setup for overall balance of power.

Don't think that you must get every watt the amp is capable of producing.  Or that the woofer RMS must be matched.  Think of RMS as the highest amount you can give it.


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