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Converting 4 ohm speaker to 8 ohm


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raceman17 
Member - Posts: 19
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Joined: December 05, 2002
Location: United States
Posted: February 05, 2003 at 8:18 PM / IP Logged  

Can I put a 4 ohm resistor in series on each 4 ohm speaker to make it an 8 ohm circuit?

Thanks

Aaron

Aaron
Derrik 
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Joined: November 02, 2002
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Posted: February 05, 2003 at 8:44 PM / IP Logged  

I dont think that's a good idea. you basically cut the voltage in 1/2. means you cut your watts in 1/2.

Why dont you tell us what you need to accomplish and maybe we can help. :)

Derrik 
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Joined: November 02, 2002
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Posted: February 05, 2003 at 9:05 PM / IP Logged  
also..the speaker is 4 ohm impetance not resistance. so...by adding an 4 ohm resistance on will not make it 8 ohm impetance
raceman17 
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Joined: December 05, 2002
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Posted: February 05, 2003 at 9:25 PM / IP Logged  

What if the speakers were bridged so I could have more watts?

Thanks

Aaron

Derrik 
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Joined: November 02, 2002
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Posted: February 05, 2003 at 9:54 PM / IP Logged  

usually the amp can put out more watts if your impetance is low. are you trying to  connect the speakers in series? so you can have 4ohm +4 ohm = 8ohm? I dont see what good that will do and the truth..i've never done that. I've connect speakers in parallel. which 1/4 + 1/4 = 1/x which = 2 ohm load which most amp that can handle 2 ohm load will put out more than 4 ohm.

Be more specific and detail of what you're doing. tell me about your amp. your speakers. etc

raceman17 
Member - Posts: 19
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Joined: December 05, 2002
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Posted: February 05, 2003 at 11:22 PM / IP Logged  

The amp is a mtx pro75x2 here are its specs

RMS Power measured at 12.5 Volts DC:

37.5 watts x 2 into a 4 ohm load with less than 0.05% THD+N
75 watts x 2 into a 2 ohm load with less than 0.1% THD+N
150 watts bridged into a 4 ohm load with less than 0.1% THD+N
Dynamic Power (IHF-202 standard) measured at 14.4 Volts DC:
90 watts x 2 into a 4 ohm load
165 watts x 2 into a 2 ohm load
325 watts bridged into a 4 ohm load

The speakers are a 12" kenwood

Impedance: 4 ohms,  Power Handling: 700 Watts, and I think 175 watts rms

The head unit is a kenwood kdc-519

I'm new at this but, a buddy of mine made the suggestion since my speakers weren't 8 ohm.  And see, the amp will put out 325 watts bridged into a 4 ohm load.  So, if the speakers were connected in parallel and, in this particular case 1/8 +1/8=1/x   where,  x would equal the 4 ohm load which, my amp is designed for.  Like i said, I am new at this and I don't know.  It seems like it would work (in theory) if i could find a resistor to carry all the wattage but, any help would be appreciated.  

Thanks

Aaron 

Aaron
fakepete 
Copper - Posts: 99
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Joined: April 21, 2002
Location: United States
Posted: February 06, 2003 at 7:45 AM / IP Logged  
Your only impedance choices using those two subs together are 8 ohms or 2 ohms.  I would say either run them at  the 90w x 2 @ 4ohms or get a 2 ohm stable amp.

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