Powering two 6x9's

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=2827
Printed Date: June 10, 2024 at 2:21 PM

Topic: Powering two 6x9's

Posted By: sparkyssb
Subject: Powering two 6x9's
Date Posted: August 16, 2002 at 12:02 PM

Hey guys,

I've got two Rockford Fosgates 80W normal 160W max... (i think)..

Neways, I need to power them for my poppa in his Lumina and I need to know how I should power them...They are rated 8 Ohm and the factories I took out were 10 Ohms....now, I have no freaking clue what Ohms do..i just know they have something to do with resistance....well, Im gonna get a CHEAP amp to power these a bit more than what they are running..I am thinking about running down to my local Walmart and pick up a little amp (like 60W or something) to help power.

Well, my question is, how many channel amp do i need? 2? also, how do I figure out what Ohm rating amp that I should get to power these two 6x9s?

thanks for your help! posted_image

Replies:

Posted By: SOUND PRESSURE
Date Posted: August 16, 2002 at 1:09 PM

Hey sparky,

Yeah you don't need much unless your poppa is into audio as all of us here are. A small decent 2 ch. amp should be just fine to clean up and boost the sound. Basicly look on the box to see what the amp is rated at usualy they will have something like, example-2 x 85 watts RMS @ 2 ohms and 300 watts Max Bridged or the rating at 4 ohms.

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Sound Pressure

You know you have the right amount of pressure when your eyes start to water! Now you've got Juice!

Posted By: sparkyssb
Date Posted: August 16, 2002 at 1:56 PM

thanks sound...

So it really doesnt matter what ohm amp i get? or do i need a 4 ohms bridged/2 ohm x2? im sorry..im so confused..when i did my install for my truck, i unfortunately didnt worry about the ohms..just wattage..i just bridged the two channels together and hooked it up to the sub and I heard thumping. hehe posted_image

P.S. my dad isn't into car audio like us...i just thought it would be nice of me to boost his sound a little bit for his birthday. posted_image lol

Posted By: SOUND PRESSURE
Date Posted: August 16, 2002 at 10:05 PM

Hey sparky,

It's like this if you have an 8ohm speaker hooked up straight to one channel, you have 8 ohms. If you have two 8ohm speakers wired to each channel independantly you have 8ohms. Now wire the subs together taking both positives from each speaker and both negatives from each speaker and wire them to one channel then you have 4 ohms. Do you see how that works? It's a little confusing I know. Hook up your DMM if you have one and see your ohm load change as you wire it seperate together and bridged. Hope this helps a little. Happy Birthday to your dad!

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Sound Pressure

You know you have the right amount of pressure when your eyes start to water! Now you've got Juice!

Posted By: alitaki
Date Posted: August 17, 2002 at 9:32 AM

Sparky,

The higher the impedance (ohm rating) of the speaker, the lower the power output will be from the amp they're connected. So, if a 2 channel amplifier is rated at 50wrms p/ch @ 4ohms, expect to get less than 50 watts per speaker.

If your dad doesn't care about the staging (left to right channel separation) then you can get an inexpensive, bridgeable 2 channel amp and use that output to power the speakers (connected in parallel).

Nikos

Posted By: sparkyssb
Date Posted: August 17, 2002 at 9:45 AM

hey..thanks guys. appreciate the help! posted_image

i understand better now.