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Reload Thread: Can you bridge a HU?

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    chase297's Avatar
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    Can you bridge a HU?

    I know you can bridge most for channel amps but is it possible to do it on a HU. Cause I have a 7893 and Im gonna be running components off an external amp, so I wanted to know if I could send a little more power to the rears. Thanks







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    abcdefg's Avatar
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    bridging a h/u is not recommended...



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    how come just puts to much stress on it?




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    Originally posted by chase297
    how come just puts to much stress on it?
    yea i think that it can mess up the internal mp on the h/u



    Pioneer Premier DEH-660
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    check this out guys:
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    Your internal amp wasn't meant to handle anything more than a 4 ohm load...just like some amps are only 2 ohm stable, its not recommended to run anything with a lower impedance on it...





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    i run 2 channel's at 8 ohm, the other 2 at 4 ohm, nothing's happened yet, and i hope nothing will happen until i get my new 4-channel amp.




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    8 ohms is higher than 4 ohms...it can probably handle that.





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    ohms

    if you run your headunit into an 8 ohm load. your cd player will have to work harder to force power through the increased resistance. if you play you hu at high volume you will run into heat problems caused by the over-exertion.




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    well, when i get a job, i'll get a nice Helix 4 channel and get rid of the 3 1/2"s in the dash, since they're basically useless.




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    Re: ohms

    Originally posted by f150_on_32s
    if you run your headunit into an 8 ohm load. your cd player will have to work harder to force power through the increased resistance. if you play you hu at high volume you will run into heat problems caused by the over-exertion.

    Um thats actually not correct. Since the load impeadance is higher the radio cannot "force" more power to the speakers. It simply will not produce as much power into a higher impeadance load.. If anything the radio will run cooler at higher volume setting since the amplifier cannot produce as much power into an 8ohm load..



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    i did it with a pioneer

    i had a pioneer hu and i had an 8 ohm load on each channel. after about 15 mins of over 25 volume, it melted the glue that held the custom cd label on my cd. i had to send it off because the label meltedand got stuck inside. pioneer told me it was because of the ohm load i was running. may be they were lieing




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    it probably was .....i wouldnt think that would happen though.



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    Less impeadance = more power = more heat. More impeadance =less power=less heat.


    It wasn't because of an 8ohm load, that is actually easier on the output devices..



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    I hate to burst everyone's bubble, but impedence has little to do with heat. Heat is generated by current, or a by-product to state it correctly. If you have a constant voltage and constant impedence (or resistance) and a varying current then you will generate heat- regardless of what level the impedence is at. f150_on_32s- your deck melted because you played it too loud for too long, and it was probably bound to happen anyway. One correlation impedence has to current is when the impedence varies. But for this to occur the current would have to be constant, which it rarely ever is. So basically it's just too simple to say: "Less impeadance = more power = more heat. More impeadance =less power=less heat." without taking into account the status of the current in the system, as well as the direction the current is flowing. Less mipedence could mean more heat, it could mean less heat. What the change in impedence does do is make hard for the device to regulate the voltage, hence amps stating their stability at certain ohm levels.




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    Rockman's Avatar
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    But for the most part as you lower the impeadance especially with amplifiers more current will flow. So your saying if you run a 2 ohm load vs an 8 ohm and amplifier will not produce more heat. Any decent amp is going to produce more power at 2ohms than at 8ohms. How does it do that , by producing more current. More current is going to make more heat. How did you make more current, by lowering the impeadance. Its general statement yes, but it is also accurate.



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