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What is the danger of using 3-ohm speakers with 4-ohm receiver?


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#1 of 4 OFFLINE   TacoD

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Posted July 15 2009 - 07:19 AM

Hello, home theater newbie here. My A/V receiver says the minimum speaker impedance it supports is 4 ohms. You have to set it to a special setting for 4-ohm speakers which I have done. But my front left and right speakers say that their impedance is 3 ohms. What the danger in this? Is the danger to my speakers or to my receiver?

The receiver is Panasonic SA-BX500. The speakers are the ones that came with Panasonic SC-PT750 a couple of years ago. I have already discovered that since the subwoofer that came with the SC-PT750 is not powered, it won't work with my new receiver -- I hope I don't have to buy new front left and right speakers too. Thanks for any help you can offer.



#2 of 4 OFFLINE   Gerald LaFrance

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Posted July 15 2009 - 07:51 AM

Hi the danger is mostly with the Reciever ..but probally minimal??
"IF the Facts don't Fit the Theory Change the Facts"    Albert Einstein

#3 of 4 OFFLINE   Stephen Tu

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Posted July 15 2009 - 11:06 AM

Receivers have protection circuits, should shut down if the speakers draw too much current.

Replacing the speakers shouldn't be a big loss as the ones that come in HTiBs aren't that great to begin with, although it's a bit of money your sound will be ton better.  For $80-100 you can get a pair of bookshelves that would do much better.  For a whole system including sub you'd probably have to go min $300, more/better choices if you have more budget.


#4 of 4 OFFLINE   MaxL

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Posted July 15 2009 - 01:22 PM

 that's a pricey receiver to be using with HTiB speakers.  you don't have to do anything, but if you're looking to upgrade from the old HTiB, you may have made a slight miss step.  nothing horrible just not what anyone here would have likely chosen.   there are better avr's available for the money on paper, but if your happy with it that's all that matters.

i'm going to guess you wanted the HDMI and and new audio formats for bluray and that's why you picked up the new receiver.  from a sound quality standpoint, speakers have the largest impact on what you hear, so most people will recommend putting most of your budget towards speakers over electronics.  that said, if your electronics won't do what you need the to, they need replacing or getting.  the point is that you should expect the cost of your speakers to be  equal to or greater than the cost of your avr in most situations.  (i'm sure there are people who wold disagree.)

if i were you, i'd plan on replacing all the panny speakers from the old set.  but there's no rush.  as long as you're not trying to break things with high volumes, your avr will likely be fine.  i'd replace all 3 fronts together from the same manufacturer and line.  then get a new sub and finally the surrounds, preferably but not necessarily to match the fronts.

good luck

HT: Marantz SR8000, PSB Alpha B fronts, Alpha C center, CSW Newton S200 surrounds, Martin Logan Dynamo Sub, Marantz DVD, Sony CRT TV

Stereos include vintage Sony receivers/amps into vintage AR and KEF speakers.