ohm's law question

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djdaveoc

Copper - Posts: 231

Joined: April 28, 2004

Location: United States

Posted: December 20, 2004 at 6:56 PM / IP Logged

I have a sub with 2 4-ohm voice coils. If I want to run a sub amp in mono, how many ohms load with the sub be? I'm asking because I'm trying to pair up a sub with an amp that will be a good fit power wise. Thanks for any help. I'm a brand newbie to car audio!

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Lizardking

Copper - Posts: 184

Joined: August 23, 2004

Posted: December 20, 2004 at 7:33 PM / IP Logged

Wired in parallel that would be a 2ohm load to your amp...If you run in series I believe that would be a 8ohm load to your amp..

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darthness

Copper - Posts: 136

Joined: December 12, 2004

Posted: December 20, 2004 at 7:37 PM / IP Logged

and in case you didnt know, you'll want run a 2ohm load, not 8ohm.

contrary to most things, smaller amount of ohms = better. i forgot why though :))

12v.boogie

Member - Posts: 11

Joined: October 29, 2004

Location: United States

Posted: December 20, 2004 at 7:40 PM / IP Logged

wired in parrell its 2 ohm but if you monoout an amp it cuts it down to a 1 ohm.

Lizardking

Copper - Posts: 184

Joined: August 23, 2004

Posted: December 20, 2004 at 7:43 PM / IP Logged

Lower the ohm the better unless you push your amp to it's limits then it's not..

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pneise

Member - Posts: 2

Joined: August 26, 2004

Location: United States

Posted: December 20, 2004 at 8:21 PM / IP Logged

darthness wrote:

and in case you didnt know, you'll want run a 2ohm load, not 8ohm.

contrary to most things, smaller amount of ohms = better. i forgot why though :))

lower resistance means more current for a given voltage=more power to speaker :)

stevdart

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Joined: January 24, 2004

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Posted: December 20, 2004 at 8:24 PM / IP Logged

Shop for a mono class D amp with ratings that include wattage at a 2 ohm load impedance.

djdaveoc

Copper - Posts: 231

Joined: April 28, 2004

Location: United States

Posted: December 20, 2004 at 8:49 PM / IP Logged

I know I mentioned the dual VC sub but now I'm thinking of getting a JL Audio 12W7 since I already have the subzone box for it. Any suggestions on the amp brand and model? I'm thinking maybe a PPI but if there is an amp that would be a good fit for a 12W7 that costs less than PPI but is almost as good, I'm open to ideas. I just want to make sure and power the sub to it's full RMS capacity which I believe is 750 watts RMS into one 3-ohm voice coil. Thanks again!

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djdaveoc

Copper - Posts: 231

Joined: April 28, 2004

Location: United States

Posted: December 21, 2004 at 6:01 PM / IP Logged

Lizardking what is the difference between wiring in parallel and wiring in series? Thanks.

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stevdart

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Posted: December 21, 2004 at 8:30 PM / IP Logged

Incredible what you find out with a Google search! 288,000 results in a quarter second....but you'll find all you need on the first page.

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