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Converting 4 ohm speaker to 8 ohm

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=9122
Printed Date: June 03, 2024 at 8:46 AM


Topic: Converting 4 ohm speaker to 8 ohm

Posted By: raceman17
Subject: Converting 4 ohm speaker to 8 ohm
Date Posted: February 05, 2003 at 8:18 PM

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

Thanks

Aaron



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Aaron



Replies:

Posted By: Derrik
Date Posted: February 05, 2003 at 8:44 PM

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. :)





Posted By: Derrik
Date Posted: February 05, 2003 at 9:05 PM
also..the speaker is 4 ohm impetance not resistance. so...by adding an 4 ohm resistance on will not make it 8 ohm impetance




Posted By: raceman17
Date Posted: February 05, 2003 at 9:25 PM

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

Thanks

Aaron





Posted By: Derrik
Date Posted: February 05, 2003 at 9:54 PM

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





Posted By: raceman17
Date Posted: February 05, 2003 at 11:22 PM

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 



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Aaron




Posted By: fakepete
Date Posted: February 06, 2003 at 7:45 AM
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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