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4 ohm speakers for 8 ohm impedence on receiver (HT)

I just received an awesome receiver to replace my broken one. It is a sony STR-DE545. My speakers from my old receiver are from a htib sony from 2001. Link

They are rated 4 ohm 100w speakers but the receiver is rated at 100w and 8 ohm per channel on center and rear speakers. I do not know what i can do. I have extra speakers that i can series with the speakers to get 8 ohm but then it gets cluttered. Is there anything you guys can offer?

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  • gt50201 Jan 24, 2008

    hmm well good thing you told me that. This other site told me that it would be able to handle the 4 ohm speakers as long as i didnt turn them to theater levels.

  • hapki69 Oct 09, 2008

    I actually have the opposite problem...I have 8 ohm spkrs but my receiver calls for 4 ohm....please advise if this would hurt my new reciever.thanks.

  • vjtrek May 21, 2009

    same as before. car amplifier 4 ohm on 8 ohm speakers, just to fill up the room {on separate sound card}. i havent actually did it but i intent to...tomorow. is it worth it?

  • Anonymous Mar 29, 2014

    just want to know if they are good speakers



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Ya cant run them 4 ohm on 8 ohm sterio run super hot then fail sooner gota get sum nice 8 ohm ones ok flouece off ebay is relly good cheap 8 ohm

Posted on Jan 24, 2008

  • nick helpap
    nick helpap Jan 24, 2008

    ya see ya maby ok but after wile doble the heat and load on amps ok no good

  • nick helpap
    nick helpap Jan 24, 2008

    dont forgeto mark this as fix ya ok



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Impedance setting on Yamaha AV Receiver

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Speaker Imedance Matching - Sony STR DE 997 receiver with 120Watts - 8 ohms output with Benz 6 ohms..Tower Speakers

hi pawanh75,

thanks in advance for a very informative setup that you have.

Here are some of possible mods , only if you like and can DIY

( or have someone to help you )

• Using a 6 ohms impedance for an 8 ohm impedance amp clearly

denotes that it heats up the output stages.

(please forgive my very technical words)

• One way to lessen the heat is to install a blower .

Use a 220V blower on top of the receiver.

( air should be in going up direction ).

• Before I proceed further please indicate if having the speaker

connected and having a zero volume , and just letting the receiver

in an "On" state deliverately produce heat on the receiver, or just

when the volume is at medium to high level.

If it s running hot at zero level with speaker , please post.

If it is running hot even without speaker, post also

• It may also helps , if you have a powered subwoofer ( for the low's),

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Can you tell me model number of the speakers who compatible with my sony str-333s receiver.

Sony STR 333S have an out put power of 25W into 8 Ohms speakers. You can use any bookshelf speakers with an impedence of 8 Ohms.

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1 Answer

Hi I purchased a sony av amplifier model STR-DB930 on e-bay a few months ago and I am using 3 ohm speakers from my old surround sound system. The output selector on the back of the unit is set to 4 ohms....

The lower number in Impedance specs is not a suggestion. It's a limit. 3 is not between 4 and 8.

Register and download the manual for free at

If you don't want to buy new speakers, settle for safer low volume levels.

You're going to kill that receiver driving a 3-ohm load. HTS-style speakers aren't reliably re-deployable to other electronics. Perhaps, if you have 4 speakers and they're similar you could wire them in SERIES and present a 6-ohm load to each channel.

Re-engineering the speakers themselves is, well, don't do it. It isn't rocket science but it also isn

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I can see why you're asking for help on this. It almost seem this unit has been 'disappeared' as far as online information is concerned. Even Sony has nothing on it.

I founs some articles and For Sale posts:
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The power consumption figure shown in a photo below says "145W", which would be consistent with a 35 watt amplifier.

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Halo this receiver gets very hot when i use 4

Check the impedance on the rear of the speakers and then check the back of the receiver...the receiver will say on the back what the minimum impedance for each speaker should be...if the receiver says min of 8 ohms per speaker and you are running 4 ohm speakers, then the impedance is mismatched and this will eventually burn up the amplifier in the receiver

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Best Answer - Chosen by Voters An ohm is a unit of electrical resistance. You can think of it as your speaker will impede or pull 8 ohms from the amplifier that is powering it.

8 ohms is less resistance than 4ohms. So a 4 ohm speaker would require more juice than your 8 ohm.

If this is the only speaker, then that's all the resistance you have to worry about handling. If you had two of these speakers wired in parallel, then the total impedence would be up to be 4 ohms, because each speaker actually reduces the resistance in the 8 ohms + 8 ohms = 4 ohms.

You use this information to make sure your amplifier is powerful enough for the speakers. If the speakers have too much resistance, they'll fry your amp.

Here's a good sentence to help explain, but I recommend reading the article I linked in sources...

"An amplifier designed to put out 100 watts into 8 ohms will put out 200 watts into 4 ohms. Two 8 ohms speakers wired in parallel (4 ohms total) would cause the amplifer to produce 200 watts." Source(s):…

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