acquiring eight ohms

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t&t tech

Platinum - Posts: 2,608

Joined: October 05, 2008

Location: Trinidad and Tobago

Posted: November 10, 2009 at 3:14 PM / IP Logged

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!

j.reed

Copper - Posts: 716

Joined: January 05, 2009

Location: Arkansas, United States

Posted: November 10, 2009 at 3:24 PM / IP Logged

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

haemphyst

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Location: Michigan, Bouvet Island

Posted: November 10, 2009 at 5:00 PM / IP Logged

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.

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."

t&t tech

Platinum - Posts: 2,608

Joined: October 05, 2008

Location: Trinidad and Tobago

Posted: November 10, 2009 at 5:19 PM / IP Logged

Thanks fellas!

DYohn

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Posted: November 10, 2009 at 5:26 PM / IP Logged

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

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j.reed

Copper - Posts: 716

Joined: January 05, 2009

Location: Arkansas, United States

Posted: November 10, 2009 at 5:33 PM / IP Logged

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.

j.reed

Copper - Posts: 716

Joined: January 05, 2009

Location: Arkansas, United States

Posted: November 10, 2009 at 5:34 PM / IP Logged

DYohn wrote:

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

This would be my choice as well.

sciullo779

Member - Posts: 12

Joined: November 10, 2009

Location: Pennsylvania, United States

Posted: November 10, 2009 at 10:19 PM / IP Logged

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

j.reed

Copper - Posts: 716

Joined: January 05, 2009

Location: Arkansas, United States

Posted: November 10, 2009 at 11:06 PM / IP Logged

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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acquiring eight ohms

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