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confused about ohms need help


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o9cky0984 
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Posted: April 08, 2004 at 2:02 AM / IP Logged  
MY amp is 250 rms x2 or 500 rms x 1 at 2 ohms stable, my question is can i run 2 - 4 ohm subs on this amp? Also how would i wire this set up is posible?
xtreamcc 
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Posted: April 08, 2004 at 2:06 AM / IP Logged  
yes, well, if you have a single voice coil sub that is 4 Ohms you can just wire postive to postive and negative to negative. If you have a dual voice coil sub that is dual 4 ohm coils you'll want to wire them in parrallel to get a 2 ohm resistance. To do that just wire one positve to the other and one negative to the other then run them both to the amp (you'll have one line from the amp, then just run the line from the first coils positive to the other coils positive and the same for the negative).
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o9cky0984 
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Posted: April 08, 2004 at 2:11 AM / IP Logged  

they are single voice coil so i just reverse positive and negative coming from the amp?

xtreamcc 
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Posted: April 08, 2004 at 2:17 AM / IP Logged  
reverse? I dont think I said anything about reversing. I just ment connect the amp's hook up to the same polarity of the subs (positive to positive, negative to negative) sorry if I confused you confused about ohms need help -- posted image.
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o9cky0984 
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Posted: April 08, 2004 at 2:20 AM / IP Logged  
ok thanks didnt want to mess up a set of xtants by hooking them up to something that wouldnt work
DYohn 
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Joined: April 22, 2003
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Posted: April 08, 2004 at 8:21 AM / IP Logged  
What's the make/model of your amp?
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o9cky0984 
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Posted: April 08, 2004 at 11:46 AM / IP Logged  
its just a jensen 500 watt from sears i bought it from a friend a few months back im also running a compacitor im not sure on the model of the amp its in my trunk and i dont feel like going outside right now to find out
DYohn 
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Posted: April 08, 2004 at 12:06 PM / IP Logged  

Which model Jensen? XA2250?  The RMS power output on that amp is actually closer to 125 watts into 4 ohms per channel, and that's on a good day.  Jensen amps cannot be bridged into a 2-ohm load, they require a minimum 4-ohm load.  I recomend you connect your subs in series to this amp bridged.  This will place an 8-ohm load on the amp and deliver at best 125 watts RMS to each sub.  Hook like this:

confused about ohms need help -- posted image.

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o9cky0984 
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Posted: April 08, 2004 at 12:11 PM / IP Logged  
its model xa2125
DYohn 
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Joined: April 22, 2003
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Posted: April 08, 2004 at 2:04 PM / IP Logged  
Same hookup.  4-ohm stable in mono mode.  Actual output on this amp is about 100 watts per channel into 4-ohms (again, on a good day.)
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