changing impedance?

Home / the12volt's Install Bay / Car Audio / changing impedance? (

Topic Closed)

Welcome Guest :)

Members

Next Page > < Prev Topic Next Topic >

bigt_45

Copper - Posts: 48

Joined: July 07, 2003

Location: United States

Posted: October 26, 2004 at 4:17 PM / IP Logged

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

jeffchilcott

Platinum - Posts: 2,483

Joined: April 11, 2002

Location: United States

Posted: October 26, 2004 at 5:11 PM / IP Logged

well I dont know why you would build a system out of 6x9's but ok i guess, 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

2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR

2007 USACI World Champion

2007 World Record

2006 USACI Finals 2nd Place

stevdart

Platinum - Posts: 5,816

This member has made a donation to the12volt.com. Click here for more info.

This member has been recognized as an authority in Mobile Audio and Video. Click here for more info.

This member consistently provides reliable information

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: October 26, 2004 at 8:13 PM / IP Logged

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.

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 26, 2004 at 8:33 PM / IP Logged

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?

DYohn

Moderator - Posts: 10,741

This member has been recognized as an authority in Electrical Theory. Click here for more info.

Joined: April 22, 2003

Location: Arizona, United States

Posted: October 27, 2004 at 8:21 AM / IP Logged

What kind of crossover are you using?

Support the12volt.com

bigt_45

Copper - Posts: 48

Joined: July 07, 2003

Location: United States

Posted: October 27, 2004 at 8:27 AM / IP Logged

I am not using a crossover

Wiseguy

Copper - Posts: 159

Joined: December 19, 2003

Location: United States

Posted: October 27, 2004 at 9:47 AM / IP Logged

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

Clarion DXZ745MP

Kove ZX504

Kove AG1400

Kove 12" T3 Armageddon

Kove 6.5" Compaxials

WILDER 6.5" Pro-Audio Drivers

Custom Pre-amp

Wiseguy

Copper - Posts: 159

Joined: December 19, 2003

Location: United States

Posted: October 27, 2004 at 9:51 AM / IP Logged

what the point to all this? why dont u just spend your time, effort and money and a nice system that was made for home use? there are plenty out there....

Clarion DXZ745MP

Kove ZX504

Kove AG1400

Kove 12" T3 Armageddon

Kove 6.5" Compaxials

WILDER 6.5" Pro-Audio Drivers

Custom Pre-amp

bigt_45

Copper - Posts: 48

Joined: July 07, 2003

Location: United States

Posted: October 27, 2004 at 11:43 AM / IP Logged

I have spent a lot of money on the cabinets for the speakers, which I had already. I need to make this work, but I dont want to spend too much on a part to raise the ohms. Is there anything I can buy at radioshack to wire inside the cabinet? I dont mind if I lose some of the volume. Would a high ohm resistor do the job? If so, what size should I get?

Wiseguy

Copper - Posts: 159

Joined: December 19, 2003

Location: United States

Posted: October 27, 2004 at 11:56 AM / IP Logged

sorry i meant low ohm, high current

look at http://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 changing impedance? -- posted image.

Clarion DXZ745MP

Kove ZX504

Kove AG1400

Kove 12" T3 Armageddon

Kove 6.5" Compaxials

WILDER 6.5" Pro-Audio Drivers

Custom Pre-amp

Next Page >

Printable version

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Search the12volt.com

Follow the12volt.com

Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.