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ohm's law question


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KarTuneMan 
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Joined: December 14, 2004
Location: Isle Of Man
Posted: December 22, 2004 at 1:11 AM / IP Logged  
The second post in this , and on this topic.....should have been "what make and model amp" are ya using for your sub(s). You need to get the subs and the amp together so you don't waste money and time
djdaveoc 
Copper - Posts: 231
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Posted: December 22, 2004 at 1:43 AM / IP Logged  

stevdart, I found the information online, thanks.  Hopefully I'll understand it.  I guess some of the people on here have an engineering or electronics background, but I have none of either.  So reading things that are written by advanced engineers is a real nightmare for me.  I know because my father is one of them.  They use technical terms that a newbie does not understand, so really, I feel like a need a translator.  I was hoping to get a very brief answer in plain English that anyone could understand.

And Kartuneman, thanks for your reply I think.  I didn't really understand what you said.  In my last post I stated that I might get a JL Audio 12W7 sub which I think is one 3-ohm voice coil and takes 750 watts RMS.  I asked what amp someone would recommend that would put out the right amount of power for this sub.  I think that JL Audio says that 1,000 watts RMS is too much and 500 is too little.

ohm's law question - Page 2 -- posted image. Plan, Research, Do
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: December 22, 2004 at 8:49 AM / 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 :))

That's just plain wrong.  Ohms are ohms and low is not better than high or vice versa.  Lower ohm load on an amp will cause it to push more current and result in more power output, but at the cost of SQ, noise, heat generation, power load on your system, etc.  Too low an ohm load will blow fuses and can fry your amp.  Higher ohm loads sound much cleaner and allow your amp to function with less power draw and less heat and more safely.  Matching the ohms load of your loudspeakers to the best operating characteristics of your amp is the "better" thing to do.

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djdaveoc 
Copper - Posts: 231
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Joined: April 28, 2004
Location: United States
Posted: December 22, 2004 at 11:13 AM / IP Logged  
So I guess for the JL Audio 12W7 I will have to look for a class D mono sub amp that puts out 1,000 watts RMS into 2-ohm or 500 watts RMS into 4-ohm.  That would mean it would put out about 750 watts RMS into a single 3-ohm voice coil of the sum, correct?
ohm's law question - Page 2 -- posted image. Plan, Research, Do
dedlyjedly 
Copper - Posts: 94
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Joined: November 17, 2004
Location: United States
Posted: December 22, 2004 at 5:23 PM / IP Logged  

12v.boogie wrote:
wired in parrell its 2 ohm but if you monoout an amp it cuts it down to a 1 ohm. 

NOPE, even if i could monoout anything, joining the output of two channels into one, sometimes affectionately referred to as bridging,   has no affect on impedance!!! i repeat, no affect

that said, the impedance presented to the amp does greatly affect output performance, but has no change on impedance. of course you must disregard all of this when wiring up the flux capacitor

MECP certified, 5yrs experience, you probably otta listen bitch!!
djdaveoc 
Copper - Posts: 231
Copper spacespace
Joined: April 28, 2004
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Posted: December 22, 2004 at 9:29 PM / IP Logged  
I meant of the sub.  oops
ohm's law question - Page 2 -- posted image. Plan, Research, Do
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