A little advice on Receiver spec requirements - AVS Forum
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post #1 of 5 Old 04-29-2013, 04:04 PM - Thread Starter
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I just traded for (2) Yamaha NS-555 front speakers and next need to purchase a receiver. The NS-555s are 100W nominal and 6 ohm resis.

I read somewhere that the recommended receiver would pump 10% more/channel nominal, so I want to look for 110W/Channel ?

I also read that I would be prudent to match resistance.

Here is my question: When searching for receivers, most below $300-400 show 80W/CH and 8 ohm resistance. I understand under-powering my speakers can ruin them, but what magnitude of difference does it take? I am not hardcore and my TV room will be relatively small, so am I safe to get a $300 receiver that specs 80W/CH and 8 ohm?

What is my safe tolerance in differences here?

Thanks much.
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post #2 of 5 Old 04-29-2013, 04:32 PM
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Quote:
Originally Posted by Dstag View Post

I just traded for (2) Yamaha NS-555 front speakers and next need to purchase a receiver. The NS-555s are 100W nominal and 6 ohm resis.

I read somewhere that the recommended receiver would pump 10% more/channel nominal, so I want to look for 110W/Channel ?

I also read that I would be prudent to match resistance.

Here is my question: When searching for receivers, most below $300-400 show 80W/CH and 8 ohm resistance. I understand under-powering my speakers can ruin them, but what magnitude of difference does it take? I am not hardcore and my TV room will be relatively small, so am I safe to get a $300 receiver that specs 80W/CH and 8 ohm?

What is my safe tolerance in differences here?

Thanks much.

Under powering your speakers will not ruin them. Over driving them with a low powered AVR to the point of distortion might.

Any decent AVR will drive them with no problems. Just pick the one in your price range that has the features you want. They all are going to sound virtually identical, save for the different room correction software, which at the $300 price point, won't make much difference. Especially in stereo where you would be best to not use it. IMO of course.

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post #3 of 5 Old 04-29-2013, 04:52 PM
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the speakers don't NEED 100 watts. in fact you'd likely find it unbearable tl ositen at 100 watt levels constantly. Not entirely sure in this space, but in musical instrument speaker land it's generally accepted that speaker ratings are thermal ratings- - the speaker will self destruct from the heat if assaulted constantly with that level of power over a significant period of time. It's also the general rule of thumb, at least for bass amps, that you'll start getting compression (speaker doesn't get as much louder as the incoming signal) and distortion around half the thermal rating.

Bottom line is if an 80 watt device won't get what you want out of the speakers, a 100 watt device, only about one dB louder, won't either . . . .
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post #4 of 5 Old 04-29-2013, 06:12 PM - Thread Starter
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Thanks to both of you for the advice.

Kini62: Thank you for clearing up my question about lower powered receivers. The warning of over driving with low-powered AVR is stated everywhere, but is easily misunderstood by a novice.

JHaz: You have opened up a few more simple questions, but I think I can figure them out myself.



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post #5 of 5 Old 04-30-2013, 06:54 AM
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Doubt you would even hear the difference between 80w and 100w what you may notice is what the AVR does at 4ohm some will have the same power rating and those are the ones IMO to stay away from it should at least go up and thats why I like to look at test reports.
Remember no speaker stays at its advertised ohm rating it varies with Hz most of the time the advertised is where it spends the most time, some can dip as low as 2ohm and spike as high as 16 or so ohms.
Look for graphs of your speaker and match the AVR accordingly or be careful running high volumes.
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