changing impedance?

I am building a small system with three 6x9s.  The total impedance is 4.7 ohms but i need it to be 8.  I hear that I can use something called an input coil.  Does anyone know if this will show and 8 ohm load to the amplifier?  If so, where can I get one?  Any help would be greatly appreciated.

Thank you,

Travis

I'm guessing you're using car speakers to build something for home audio?  How did you get 4.7 ohms from 3 car speakers?  At 4 ohm nominal each, you should get either 12 ohms or 1.34 ohms, depending on the wiring (series or parallel).  Paint us a picture here.

What kind of crossover are you using?

jeffchilcott wrote:

---

yes there is a product its called the veritas accumatch.    but it robs about 40% of your power....why do you need an 8 ohm load, most amps will run a 4 ohm load

---

yeah if you use something like this or even a high ohm resistor your going to lose current

sorry i meant low ohm, high current

look at https://www. digikey.com or at radio shack for like a 4 ohm resistor an i mean not a 4k ohm resistor to get your 8 ohms

but i still advise against it, its pointless

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.

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?

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

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.....