changing impedance?

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: October 27, 2004 at 11:57 AM / IP Logged

Not using a crossover, eh? This is not a good idea. I suggest you read the passive crossover section of this web site and do some research into loudspeaker design before you build something that will 1) sound like ass, and 2) potentially damage your amplifier.

Cheers.

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Wiseguy

Copper - Posts: 159

Joined: December 19, 2003

Location: United States

Posted: October 27, 2004 at 1:10 PM / IP Logged

bigt_45 wrote:

Yes, I am making a home audio system, but I am using 3 pioneer car speakers. They are Cadillac factory speakers. Two are coax speaker with dual voice coils (4 and 10 ohm) and I am using the 10 ohm voice coil. One is a single cone tweeter (6 ohm). I wired the two 10 ohms in series, then wired them in parallel to the 6 ohm. This makes the sound I need and the highest possible ohm load, which is 4.7. I am then bridging two of these 4.7 ohm units into one channel of an amplifier that is 4 ohm stable. I dont wanna burn up my amp, so I need them to be 8 ohms each. Thanx for the help, I will look into the veritas. Any other suggestions?

ok you have 2 6x9s correct? one tweeter?

the tweeter is six ohms, one 6x9 is a dual 4 ohm and the other is a dual 10 ohm?

or are they a 6x9 with two coils, a 4 ohm coil and a 10 ohm coil?

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Wiseguy

Copper - Posts: 159

Joined: December 19, 2003

Location: United States

Posted: October 27, 2004 at 1:12 PM / IP Logged

your going to need a crossover btw like dyohn said

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Wiseguy

Copper - Posts: 159

Joined: December 19, 2003

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Posted: October 27, 2004 at 1:34 PM / IP Logged

OK draw a picture of exactly what you have, what you did, and what you are trying to do

im sorry but your description is confusing the way you worded it

we'll get this to work.... you just have to try different combinations with the coils but i still think its pointless but what ever floats your boat changing impedance? - Page 2 -- posted image.

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Wiseguy

Copper - Posts: 159

Joined: December 19, 2003

Location: United States

Posted: October 27, 2004 at 1:37 PM / IP Logged

do you need it to be stereo? or mono?

and im guessing you have an 2 channel amp that has four ohm stable stereo? do u know if its bridgeable mono at four ohms? let me know EXACTLY what u have.....

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dxav

Silver - Posts: 314

Joined: September 11, 2002

Location: United States

Posted: October 27, 2004 at 1:39 PM / IP Logged

Yeah, I would not advise combining multiple speakers of different impedances. Regardless of the final total impedance, your speakers are not matched.

Are you puting them all in the same enclosure? If so, this is definitely not a good idea. If you have nice enclosures made, why not buy decent home audio speakers from www.partsexpress.com, affordable and dependable??

DXAV

Wiseguy

Copper - Posts: 159

Joined: December 19, 2003

Location: United States

Posted: October 27, 2004 at 1:42 PM / IP Logged

exactly!

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stevdart

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Posted: October 27, 2004 at 1:52 PM / IP Logged

Agree with all of the above. Parts Express always has great deals on buyouts of high quality speakers, and with a good choice of impedance. Problems aplenty with your project. Mainly, the money should go into what you hear, not what you see. Having an expensive cabinet but using bits and pieces of junkyard factory car speakers? Start with the link here, study up on crossovers, take your time...for ultimately satisfying results.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

bigt_45

Copper - Posts: 48

Joined: July 07, 2003

Location: United States

Posted: October 27, 2004 at 2:43 PM / IP Logged

its funny that you all mention parts express....thats where i got these speakers. Two of the 6x9s are pioneer speakers (apparently from a factory cadillac system). They have two coils, one at 4 and one at 10 ohms. The other 6x9 is called "extended range" by pioneer. It was supposed to be 4 ohm, but it is actually 6.5 ohms. In order to get the highest ohms possible, I wired the 10 ohm coils of the 6x9s in series, then i wired that circuit in parrallel to the other 6x9. This balanced the loundness out of the three speakers, but left me with 4.7 ohms. I need it to be 8, so that I can bridge two of them (totalling 4 ohms instead of 2.35 ohms) into an amp that is 4 ohm stable MONO. I talked to a sound tech i know and he said i just have to get the amp to "see" 4 ohms by adding a transformer or an input coil. He said he has done that on crossovers. I hope that paints a better picture for everyone.

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changing impedance?

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