acquiring eight ohms

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=117630
Printed Date: May 06, 2025 at 8:00 AM

Topic: acquiring eight ohms

Posted By: t&t tech
Subject: acquiring eight ohms
Date Posted: November 10, 2009 at 3:14 PM

I wanna connect two jbl eight inch, single voice coil subs, 4 ohms each, to an a/c reciever that's eight ohm stable on both channels, but i want to run them independently, meaning i'm not wanting to series the spekers to acquire the load, is there anyway i could achieve this? Sorry if the question isn't too smart! lol!

Replies:

Posted By: j.reed
Date Posted: November 10, 2009 at 3:24 PM

You could run a 4ohm resistor in series with each sub to get the 8ohm load.

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Posted By: haemphyst
Date Posted: November 10, 2009 at 5:00 PM

j.reed wrote:

You could run a 4ohm resistor in series with each sub to get the 8ohm load.

NO!

While this may be true, if you wire a woofer in series with a resistor, you will be dissipating HALF the amplifier's power in that resistor... Simple Ohm's law, dude...

If your receiver cannot handle 4 ohm woofers, you can't use them without wasting half of your receiver. To do it right, you are stuck with getting the proper drivers.

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Posted By: t&t tech
Date Posted: November 10, 2009 at 5:19 PM

Thanks fellas!

Posted By: DYohn
Date Posted: November 10, 2009 at 5:26 PM

Buying some 8-ohm speakers is how I'd do it...

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Posted By: j.reed
Date Posted: November 10, 2009 at 5:33 PM

haemphyst wrote:

j.reed wrote:

You could run a 4ohm resistor in series with each sub to get the 8ohm load.

NO!

While this may be true, if you wire a woofer in series with a resistor, you will be dissipating HALF the amplifier's power in that resistor... Simple Ohm's law, dude...

Yes this is true. only HALF the power will reach the sub. the other half will go to the resistor but, it is the only way without changing the subs, receiver or running his current subs into series and only using one channel of amplification. It would fit the bill of his question to the T.

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Posted By: j.reed
Date Posted: November 10, 2009 at 5:34 PM

DYohn] wrote:

Buying some 8-ohm speakers is how I'd do it...

This would be my choice as well.

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Posted By: sciullo779
Date Posted: November 10, 2009 at 10:19 PM

and noting the resistors, good luck finding one with that high of a wattage value lol

Posted By: j.reed
Date Posted: November 10, 2009 at 11:06 PM

sciullo779 wrote:

and noting the resistors, good luck finding one with that high of a wattage value lol

Pretty easy to find up to 200watts. Seeing as this is a home receiver I see no problem finding one that will work. But as said above. I would just buy 8ohm subs and call it a day.

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