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4 ohm and 8 ohm

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Old 02-04-2013, 10:26 AM   #1
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Default 4 ohm and 8 ohm

well picked up a set of 4 ohm jamo tower speakers rated 4 ohm. my yamaha rx-v620 is 100 watts per channel at 8 ohm. i have the selector 4 ohm / 8 ohm switch on the back of the receiver. i have read a lot of discussions on this and there seem to be mixed opinions on weather it makes a difference or not. any thoughts on it.
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Old 02-04-2013, 10:34 AM   #2
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It takes more power to run 4 ohm speakers. Put the switch on the 4ohm position.
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Old 02-04-2013, 10:46 AM   #3
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It takes more power to run 4 ohm speakers. Put the switch on the 4ohm position.
Yes! But also READ THE BOOK the came with the Yamaha. Power will increase @ 4ohms. You need to be aware of what is happening here. Make sure the Jamo's are rated the same or better for power handling
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Old 02-04-2013, 10:46 AM   #4
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I have my doubts that will will be able to drive those speakers properly with that reciever. Even if the amp section puts out its rated 100 watts per channel (which it won't), 100 watts is on the low side. Keep in mind that speakers rated for 4 ohms will dip lower than that. If there are pre-outs on that reciever I would use them and add external amplification.
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Old 02-04-2013, 11:00 AM   #5
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The other issue is that it is dangerous and possibly damaging to run 8 ohm and 4 ohm speakers on the same resistance (4ohms). I would definitely look at adding external amp as noted.
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Old 02-04-2013, 11:02 AM   #6
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well the jamos are rated at 200 watts and the yamaha only puts out 100 watts per channel at 8 ohms. before i thought if all that i ran them and they sounded great with the switch set at 8 ohms. the yamahas owners manual says to set it at 4 ohms for using front 4 ohm speakers but doesnt say anything about power output at 4 ohms. if it matters i never crank it up. but thats what im wondering about quad4.0, will the increase in output set at 4 ohms be what the jamos need. seems that if there rated at 200 watts and i can get a little more out of the yamaha set at 4 ohms then i should be about perfect. like i said they sounded great yesterday when listing to music at a loud volume. by the way the manual also says that in the 4 ohm setting it says = main speakers must be 4 ohm or higher, center must be 6 ohm or higher and rear speakers must be 6 ohm or higher, so i think im alright there.

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Old 02-05-2013, 06:16 AM   #7
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well i flipped the 4 ohm 8 ohm switch on the back of my yamaha to 4 ohm. listened to it all evening, no problems. cant really tell a difference but then i have read that the difference in some situations might only be 4 or 5 db. anyway seeing as the switch is there for 4 ohm and the main speakers are 4 ohm id best have it switched to 4 ohm. still, after searching the internet, cant fully see the advantage of 4 ohm over 8 ohm. i understand they have less resistance.
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Old 02-05-2013, 12:04 PM   #8
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It is not generally a good idea to drive 4 ohm speakers with a reciever, as not many recievers have a powerful enough amp section to drive 4 ohm loads. I used to have a Pioneer Elite 49 TXi reciever.The output with five channels driven into 8ohms was 133W at 20Hz and 137W at 1kHz. With two channels driven at 1kHz, clipping occurred at 168Wpc into 8ohms and at 241Wpc into 4ohms, left channel measured, at 1kHz. As you can see, this was a pretty powerful reciever. Even Still, I added a Carver TFM-35 Two channel amp (375 watts per channel). It was like listening to a new system. It really brought my speakers to life.You may be able to drive them as your set up but I would bet that listening at high volume, would likely cause clipping. I strongly suggest you consider better amplification,down the road.
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Old 02-05-2013, 01:40 PM   #9
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It is not generally a good idea to drive 4 ohm speakers with a reciever, as not many recievers have a powerful enough amp section to drive 4 ohm loads. I used to have a Pioneer Elite 49 TXi reciever.The output with five channels driven into 8ohms was 133W at 20Hz and 137W at 1kHz. With two channels driven at 1kHz, clipping occurred at 168Wpc into 8ohms and at 241Wpc into 4ohms, left channel measured, at 1kHz. As you can see, this was a pretty powerful reciever. Even Still, I added a Carver TFM-35 Two channel amp (375 watts per channel). It was like listening to a new system. It really brought my speakers to life.You may be able to drive them as your set up but I would bet that listening at high volume, would likely cause clipping. I strongly suggest you consider better amplification,down the road.

Not to mention the heat buildup when running using that amount of high wattage really pushes the power train.
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Old 02-05-2013, 01:45 PM   #10
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from what ive read id be better off leaving the 8 ohm / 4 ohm switch in the 8 ohm position to keep heat down. im looking into a preamp.
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Old 02-06-2013, 04:42 AM   #11
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from what ive read id be better off leaving the 8 ohm / 4 ohm switch in the 8 ohm position to keep heat down. im looking into a preamp.
A pre-amp is not going to help you. You need a power amp. If your on a budget, I would look at a used amp like Adcom, Parasound, Rotel, Carver etc...
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Old 02-06-2013, 07:33 AM   #12
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i called yamaha and told them what i have. they said that my receiver puts out 190 watts at 4 ohms, 250 watts at 2 ohms. they told me i shouldnt have any problems, assuming that im not going to be running the amp at full volume,and if i did it would be in 4 or 5 years. i really dont know the difference between home speakers and car speakers. how many people run 500 watt car speakers with a 100 watt amp and never have any problems. again im not a stereo expert. by the way i listened to it last night for about 6 hours, movies and tv, and checked to see if it was getting hot, barley warm to the touch. i assume that as long as its doesnt get hot it should be ok. cant think of any other way to check it.

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Old 02-06-2013, 10:53 AM   #13
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If you are satisfied that this setup works for you, then thats great.Yes you can drive speakers capable of handling 500 watts with an amp cabable of a lot less. It is just more preferrable to power speakers with an amp with a lot of headroom. There are also differences in quality and capability of amplifiers. If you get a chance, you should audition a system set up with separates of quality and you'll hear what i mean. Anyway, good luck and enjoy your audio journey.
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Old 02-06-2013, 12:08 PM   #14
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im happy with how it performs. if this amp takes a dump then ill look into a newer more powerful yamaha. it wouldnt take a lot to push me into one of those $1200.00 receivers. but for now im good.
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Old 02-07-2013, 06:27 AM   #15
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is there a good amp that will run 200 watt / 4 ohm speakers stable under $1000.00. ive looked on ebay and it seems that nad, denon and others are all 100 watt or less. seeing as these speakers are 200 watt wouldnt i need something around 200 watts per channel.
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