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

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

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Why do I blow fuses?

Hi Pete
Are you blowing fuses in the receiver/amp or speakers? Without knowing what device you're referring to, I would guess that you have a problem with your speakers not having enough power handling capability for the amp that's driving them (which would blow your speaker fuse) OR (if you're blowing receiver/amp fuses) too many speakers wired in parallel showing your receiver/amp far less than the 8 ohms or even 4 ohms impedance that it is rated for. For example, two four-ohm speakers wired in parallel shows a 2-ohm load to the receiver/amp. Not many consumer devices have the capability to load down to 2 ohms.

Hope this helps.

Nov 13, 2014 | Speakers & Subwoofers

2 Answers

4 ohm and 8 ohm speakers

You can plug in higher ohm speakers , the higher the ohm the higher the resistance is, it is a danger when you plug lower ohm speakers into a higer ohm Amp , at a high volume that will cause them to blow , the center speaker would be fine to use a higer ohm speaker , your best choice is to buy a Active Subwoofer, which means the sub has it's own power supply , and u can blast the thing as much as u like , thn u can turn the bass down on all the other speaker's so u can play it louder , and have the sub turned up has high as u like , this is the best way to get great sound with high volume , buy a Active sub woofer , any active subwoofer is ok , a active sub woofer has its own volume and inputs on the speaker ,

Dec 09, 2007 | Speakers & Subwoofers

1 Answer

The speaker has a low power output

The output of a speaker primarily depends on system design (obviously) However, perhaps you have sourced a replacement or 'upgrade' speaker for an existing system. In that case, perhaps you have an impedance mismatch. If your amplifier is designed to drive, say, an 8 ohm speaker, and you connect a speaker of 16 ohms impedance, then your sound will be softer. On the other hand, you may have connected more than one speaker to one power amplifier output. If you connected in series you add the impedances. If connect in parallel you work out the impedance using this formula:
1/Answer= 1/Speaker A impedance + 1/Speaker B impedance + 1/Speaker C impedance etc. So if you connect three speakers in parallel, each of 8 ohm impedance:
1/Answer=1/8 + 1/8 + 1/8 = 3/8
3X Answer=8
Answer = 8/3 = a little less than 3 ohms.
Reducing the load like this makes the sound louder, but risks distortion or even damage. Check your manual for amplifier tolerances. Cheers, Don.

Dec 13, 2013 | Speakers & Subwoofers

1 Answer

Can you tell me if a receiver Sony 7.1 works with speakers ss-mf515 and What happen because I use the higher volume and the speaker sound low?\r\nWhat kind of receiver works with the speakers I mencioned...

Since you don't name the receiver we have no idea of its audio power or compatibility with 'standard' 8-ohm speakers.

Register and download the manual for free at

Any normal standardized NOT-all-in-one-hi-fi-in-a-box amplifier will work with these speakers.

Apr 05, 2011 | Sony SS-MF515 Speaker

1 Answer

I just purchased a yamaha RX-V767 receiver. I have a polk surround sound speaker system 5.1 that have an impededance of 8 ohms. The receiver has an impedece adjustment knob on it. would it be safe to...

No, you don't want to do that. The Ohm output on the amplifier must match the speakers. Run 8 Ohm speakers on 8 Ohm and run all your speakers on the same impedance (Ohms). Your gonna burn your amplifier up if you run different impedances.

Mar 24, 2011 | Yamaha NS-A60X Main / Stereo Speaker

4 Answers

Impedance on my Bose 901 Series VI

there 12.9 ohms. there bose speakers not a wallmart if you want a lower impendance then run them in parralell brigde of a bridgeable amplifer/receiver

Nov 09, 2009 | Bose 901 VI Main / Stereo Speaker

1 Answer

How do I hook up my Bose 901s to my Sony Receiver Model STR-DE545?

look at your speaker wire there should be some marking the distinguishes each wire. You need to get this right make sure the negative or black color from the speaker is connected to a negative or black of the receiver. ditto for the positive (red). look on the back of the receiver you should see where the speakers get connected left, right.

Oct 24, 2009 | Bose 901 VI Main / Stereo Speaker

1 Answer

Replacing sub speaker

I wouldn't try reinventing it by replacing the driver. Drivers and their enclosures are designed to work together. And this being a self-amplified subwoofer, there is one more piece that's electrically optimized to the rest. Don't mess with it.

Why don't you just set your receiver's individual relative speaker volume levels so the sub isn't weak by comparison to your other speakers? Weakness, as you call it, is relative.

Is your receiver properly channeling Low Frequencies to the sub? Experiment with the cutoff, too.

This problem doesn't require meatball surgery.

May 18, 2009 | Sony SA-WM500 Subwoofer

1 Answer

How many ohms? 6 ? 8 ?

The AT line were all rated at 3.2 ohms. Any amp or receiver rated to handle 4 ohms loads will work. The fuses and tweeter breakers are sensitive to clipping so most low cost amp's and just about every receiver will cause undue clipping. CV stated that increasing the fuse a half amp would increase the time before blowing the fuse or breaker but that will only cause additional harm to the voice coil.

Mar 17, 2009 | Cerwin Vega LS-15 Speaker

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