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ohm and wattage question


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Lytheum 
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Posted: July 20, 2003 at 11:21 PM / IP Logged  

Hi all (<-first post)

I am looking into getting new subs for my car.  They are Adire Audios 12" Shiva's.  I am trying to find the right amp to power them.  I was looking at the JBL 600.1.  This is where my question comes in.  The amp puts out 600w rms @ 2ohm.  If I wire both subs in  parallel the final load at the amp will be 2 ohm.  Each subs load would be 4 ohms.  Would each sub draw 300w because it is wired at 4 ohm or would each sub draw 600w because thats the final load?

Thanks

Lyth

nedgeworth 
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Posted: July 20, 2003 at 11:26 PM / IP Logged  
Each sub would be drawing 300w from that setup. Amp puts out 600 so divid that by 2 subs and you come out with 300 each.
bfog99 
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Posted: July 22, 2003 at 11:02 AM / IP Logged  
I think that the output from the 600.1 is 600 watts @ 2 ohms peak output, not RMS.
Lytheum 
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Posted: July 22, 2003 at 6:37 PM / IP Logged  
hmm....from what i read it actually puts out a little over 600w rms.  Ill have to look into it more.
nedgeworth 
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Posted: July 22, 2003 at 6:59 PM / IP Logged  
Actually if you have it wired up to run at 4 ohm you will only be getting 150rms per sub. On a 2 or 1 ohm load you will get 300 each. My mistake for misreading there.
bfog99 
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Posted: July 22, 2003 at 7:10 PM / IP Logged  

Heres a site that shows the power ratings.

http://www.sounddomain.com/sku/JBLBP6001

Lytheum 
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Posted: July 23, 2003 at 9:16 PM / IP Logged  
well the load at the amp would be 2 ohm.  Each sub is dual 8 ohm so wired in parallel they are 4 ohm.  Then both subs connect to the amp makeing it a 2 ohm load(4 ohm and 4 ohm would yeild 2ohm in parallel.  The amp would then produce 600w.  Each sub would get half of that.....atleast thats how I am understanding this.  The whole Dual voice coils and 2 subs running off one amp has me a bit confused as to how it distributes the power
donkason 
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Posted: July 23, 2003 at 10:13 PM / IP Logged  
If you ran the amp at 1 channel bridged to 2 4 ohm speakers in parallel you would be delivering 600 watts to each sub.
nedgeworth 
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Posted: July 23, 2003 at 10:19 PM / IP Logged  
Ok effectively it's just like running two single 4ohm subs in parallel which the amp will see as 2ohms. The amps puts out 600 so yeap you've got your thinking straight. So 300 a piece.
wvsquirrel 
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Posted: July 23, 2003 at 10:27 PM / IP Logged  
The BP600.1 is a Mono amp, rated 600 x 1 @ 1 or 2 ohms based on a 14.4 volt electrical system. The amp has 2 sets of terminals for ease of wiring multiple subs, but it is Internally bridged already making it a technical 1 channel amp. Regardless if you use 1 or both sets of terminals, you still only have 1 real channel. If you wire only 1 sub to the amp, then you would only use 1 set of the terminals, not the + from 1 and the - from the other. If you wire 2 subs to it, then you put sub1 on one channel, and sub2 on the other. When you figure out the total ohm rating, you still base it on 1 channel (even though you are using 2 due to the internal bridge). It's confusing at first, but if you do an external bridge on that amp you run a serious risk of producing less than a 1ohm load without even realizing it.
In Lytheum's case, you would wire each DVC to it's own channel in parallel. Using 8ohm DVC's will yield 4ohms per terminal set, 2ohms overall due to the internal bridge. You will receive apx. 600 x 1 @ 2ohms, or 300 watts per sub. If you want a diagram let me know and I'll e-mail you one since I still can't post pics on the new 12volt server
Squirrel
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