what is speaker impedance - AVS Forum
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post #1 of 10 Old 12-28-2007, 07:53 AM - Thread Starter
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i have all 6 ohm speakers for my yamaha 661 but in one of the configureations it asks for 2 pair of 8 ohm speakers
i know just enough to know there is a difernce but not what impendance is.
what could happen if i use 6 ohm in place of 8 ohm speakers?
can provide more information if you need and can help me as this may be a odd question-wasnt able to find much on impendance in the search
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post #2 of 10 Old 12-28-2007, 07:57 AM
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it just means you won't have little baby speakers running around...
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post #3 of 10 Old 12-28-2007, 08:06 AM
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[quote]
Quote:
Originally Posted by jaxnjil View Post

i have all 6 ohm speakers for my yamaha 661 but in one of the configureations it asks for 2 pair of 8 ohm speakers
i know just enough to know there is a difernce but not what impendance is.

Speaker impedance can be thought of as the resistance seen by the amplifier of your reciever while operating (playing music, etc.). The speaker impedance will be important to you if your reciever's amplifier capabilities are limited. Some amplifiers can run hot, shut down or become damaged if low impedance speakers are used.

Quote:


what could happen if i use 6 ohm in place of 8 ohm speakers?
can provide more information if you need and can help me as this may be a odd question-wasnt able to find much on impendance in the search

Six Ohm versus eight Ohm speakers will not make a big difference to most amplifiers. I suspect you will be using these speakers in surround positions anyhow, so the potential problem is even smaller.

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post #4 of 10 Old 12-28-2007, 08:17 AM - Thread Starter
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tks much AV;yes they will be suround speakers
just didnt want to find out after i burned up something in my amp


ice; cute though but not the answer i was looking for
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post #5 of 10 Old 12-28-2007, 08:38 AM
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Originally Posted by iceperson View Post

it just means you won't have little baby speakers running around...


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post #6 of 10 Old 12-28-2007, 10:06 AM
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Quote:
Originally Posted by iceperson View Post

it just means you won't have little baby speakers running around...

Um...I think that's speaker impotence.


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post #7 of 10 Old 12-28-2007, 03:03 PM
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[quote=AV Doogie;12608875]
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Six Ohm versus eight Ohm speakers will not make a big difference to most amplifiers. I suspect you will be using these speakers in surround positions anyhow, so the potential problem is even smaller.

Now I am confused. My Atlantic Technology 8200e system is all 6 Ohm and the fronts and center are definitely not little speakers. I was under the impression that the ATs were pretty high end and highly efficient. Why were they designed at 6 Ohms? What are the tradeoffs between, say, 8 and 6 Ohms? Does it have anything to do with them being specifically designed to be used with a sub?
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post #8 of 10 Old 12-28-2007, 07:52 PM
 
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Speakers vary impedance by frequency. They might be 2 ohms at one frequency and 20ohms at another. A 6ohm or 8ohm rating is the manufacturer's best guess for average perfomance in normal use. THX speakers won't go below ?3.2 ohms (I forget the actual number) at any frequency by spec, so most decent amplifiers will have no problem driving them. Here is the impedance curve of the 8200.

http://hometheaterhifi.com/volume_14...07-part-2.html

For the OP. The setting probably has more to do with the protection circuit than anything else. Both settings will probably work fine until you push the amp near its limits.

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post #9 of 10 Old 12-28-2007, 09:13 PM
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Just got my Onkyo 505 and completely forget to change the speaker impedance to 4 ohms for my crappy HtiB speakers, which I can hopefully replace soon. Ran it for 2 hours at half volume and next morning protection came on and now it's useless.

Really hope I can replace them soon for a decent price, I'm back to just TV speakers now. I'm such an idiot.
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post #10 of 10 Old 12-30-2007, 02:59 PM
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[quote=kansashick;12615226]
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Originally Posted by AV Doogie View Post


Now I am confused. My Atlantic Technology 8200e system is all 6 Ohm and the fronts and center are definitely not little speakers. I was under the impression that the ATs were pretty high end and highly efficient. Why were they designed at 6 Ohms? What are the tradeoffs between, say, 8 and 6 Ohms? Does it have anything to do with them being specifically designed to be used with a sub?

The main difference between 8 and 6 ohms is 2 ohms

Seriously, most AV recievers are spec'd to provide an output into 8 0hm speakers (nominally). A 6 ohm speaker will require more current from the amplifier on average, and may cause the unit to run warmer (or hot). The impedance of the speaker really reveals nothing about the quality of the speaker, other than the fact that the crossover designer decided to make the input to the speaker network easier to drive by most AV amplifiers.

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