Sound bar and 6.5" speakers. I read I may have problems with the stock head unit. - JeepForum.com
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Go Back JeepForum.com > General Technical Discussions > Electrical, Audio, GPS, & 2-Way Radio > Sound bar and 6.5" speakers. I read I may have problems with the stock head unit.

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Unread 12-17-2009, 05:03 PM   #1
rbwamsley
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Sound bar and 6.5" speakers. I read I may have problems with the stock head unit.

I just bought these speakers (see link below) and I read that I may have some issues pushing them with the stock head unit. Could someone please explain to me why?

Speakers
Amazon.com: Polk Audio DB651 6.5-Inch Coaxial Speakers (Pair, Silver): Electronics

Thanks in advance,
Blake

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Last edited by rbwamsley; 12-18-2009 at 08:52 AM..
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Unread 12-17-2009, 05:32 PM   #2
ihatefruitloops
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because they handle 60 watts and your stock headunit will only puch about 10 or so to them
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Unread 12-17-2009, 06:24 PM   #3
rbwamsley
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Originally Posted by ihatefruitloops View Post
because they handle 60 watts and your stock headunit will only puch about 10 or so to them
I understand that, but I have never heard of any issues with under powering a speaker. The only thing I see is that they wont be at their full potential. Am I missing something?
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2.5" Rough Country Suspension Lift : 1" Body Lift : 1" JKS BMML : RC Adj. Front Track Bar : Rough Country Steering Stabilizer : 33x12.50R15 BFG All Terrains on Black Steelies
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Unread 12-18-2009, 09:48 AM   #4
SirGCal
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Well, it's a multi-part problem.

Underpowering speakers does a few things, but in and of itself isn't bad. It's these other things that become bad.

Simply, the speaker can't be controlled by the weak power source. Think of trying to drive a dump truck with a dirt-bike engine. You might actually get it to move, but not very well. At low volumes, this is fine and the speaker will do well. But when you start to try to push your volumes, the speaker's power-hungry nature will cause the power source to lose accurate control of the speaker. This can result in things like early distortion, added noise, all the way up to clipping and coil distortion that can actually damage the speaker.

The inverse (putting way too much power behind a speaker) is like putting a top fuel dragster engine in an otherwise stock sedan. First time on the gas hard, you explode parts left and right.

The perfect balance is giving the speaker the power it wants to properly operate without cooking it.Target is say 80-110% it's rated RMS potential. So with that speaker being rated 60W RMS and most of the stock TJ units I tested only having about 7W of output, you can see you're grossly underpowered. This is fine if you don't crank it. But if you try to boost it (even loud enough for topless on the highway may be too much), you'll eventually run into problems. Plus it will just generally sound bad at volume since you don't have the power to actually move the speaker.
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Unread 12-18-2009, 10:11 AM   #5
rbwamsley
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Thank you for the info. I really appreciate it!
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