4 ohm vs 8 ohm - AVS Forum
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post #1 of 11 Old 12-20-2012, 07:17 AM - Thread Starter
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What si the difference between the two and is one better than the other? I currently have in ceiling speakers that do 8 ohms but I saw Emotiva speakers do 4 ohms.
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post #2 of 11 Old 12-20-2012, 07:21 AM
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Originally Posted by asere View Post

What si the difference between the two and is one better than the other? I currently have in ceiling speakers that do 8 ohms but I saw Emotiva speakers do 4 ohms.

The difference in the two is 4 ohms smile.gif

One is not better than the other. 4 ohm speakers require more power load from the amplifier than 8 ohm speakers do. You just need to make sure that your amplifier is rated to handle a 4 ohm load.
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post #3 of 11 Old 12-20-2012, 08:34 AM
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Originally Posted by mlknez View Post

4 ohm speakers require more power load from the amplifier than 8 ohm speakers do.
4 ohm speakers require twice the current capacity as 8 ohm. Most high quality amps and receivers can handle 4 ohm loads, but not all can. There's no advantage to using 4 ohm speakers, so all things considered IMO you should avoid them.

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post #4 of 11 Old 12-20-2012, 08:35 AM
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I can hear a difference between speaker ohms, but then again I take my listening seriously.
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post #5 of 11 Old 12-20-2012, 08:40 AM
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I can hear a difference between speaker ohms, but then again I take my listening seriously.

What? confused.gifbiggrin.gif

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post #6 of 11 Old 12-20-2012, 09:28 AM
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Some go ooooohhhmm, others go ommmm
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post #7 of 11 Old 12-20-2012, 10:27 AM
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Quote:
Originally Posted by Bill Fitzmaurice View Post

4 ohm speakers require twice the current capacity as 8 ohm. Most high quality amps and receivers can handle 4 ohm loads, but not all can. There's no advantage to using 4 ohm speakers, so all things considered IMO you should avoid them.

It's not twice the current, it's about 40% more current for a given amount of power dissapation by the speakers. Power is proportional to the current squared.

The impedance of a speaker isn't like the resistance value of a resistor. It varies with frequency. The actual impedance will fluctuate a lot over the course of a song. The impedance values are just a ballpark figure to give you a general idea of what kind of resistive load a speaker might give you.That's why the rating are always a big round number like 4,6, or 8 and not 6.71. Many speakers, paricularly cheap speakers made in China, just blindly stick a 8 ohm rating on the speaker. I've found, in general, 4 ohm speakers to be of better quality than 8 ohm in that a manufacturer probably took the time to measure an accurate impedance and hence probably took more time to build a better speaker.

The other thing to keep in mind is that while a 4 ohm speaker requires more current for a given volume level, at the same time, the receiver or amp is capable of delivering more current. The lower the resistive load, the higher the power rating for the receiver or amp.

My personal experience is the ohm rating on a speaker is something I generally ignore. I've ownded many 4 ohm speakers and have never experienced that an amp or reciever has any more trouble driving them then similar 8 ohm speakers. Speaker sensitivity is more important than impedance when it comes to how loud you can play a speaker beofre an amp blows.
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post #8 of 11 Old 12-20-2012, 10:38 AM
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There's some pure gold in this thread! biggrin.gif
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post #9 of 11 Old 12-20-2012, 10:44 AM
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Originally Posted by russ_777 View Post

There's some pure gold in this thread! biggrin.gif
And some pure bull too! smile.gif

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post #10 of 11 Old 12-20-2012, 11:20 AM
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Comparing speaker A with a 4 ohm impedance to speaker B with an 8 ohm impedance and saying speaker A sounded better while attributing this to the impedance, is pretty wrong.

Though I generally aim for 6 ohm speakers. Simply because my receiver doesn't claim to handle 4 ohm at all, and I think 6 ohm sounds cooler.

BTW, I'm pretty sure J Real was being sarcastic.

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post #11 of 11 Old 12-20-2012, 01:46 PM
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Originally Posted by Louquid View Post

BTW, I'm pretty sure J Real was being sarcastic.
Possibly, but if was his imitation of an oddiophool it was a very convincing one. cool.gif

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