Nominal vs RMS?? - AVS Forum
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post #1 of 10 Old 03-13-2013, 11:41 AM - Thread Starter
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I hate the search engine on forums. They give you everything except what youre looking for. I hated to start a thread over a simple question, but I couldnt find jack on Google except ambiguous mumbo jumbo. I have a speaker that spec'd at 10 Watts RMS Nominal Power and 200 peak. Now, I know what peak is, I know what RMS is. But what does nominal mean? Secondly, isnt this kind of an odd combo of wattage handling for a speaker if nominal indeed means the same as RMS? A speaker that can handle 200 watts peak and only 10 watts RMS seems to be an unlikely pairing. These are the specs for my center channel that Im pushing with a 200 watt power amp. If it is in fact only 10 watts rms, then I would think that my 200 watt rms amp would be too much for this speaker. Am I missing something here??
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post #2 of 10 Old 03-13-2013, 12:09 PM
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Originally Posted by Daffypuck View Post

But what does nominal mean?
Nothing. The only rating that matters is RMS. Everything else is marketing piffle.

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post #3 of 10 Old 03-13-2013, 02:01 PM
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Originally Posted by Daffypuck View Post

I hate the search engine on forums. They give you everything except what youre looking for. I hated to start a thread over a simple question, but I couldnt find jack on Google except ambiguous mumbo jumbo. I have a speaker that spec'd at 10 Watts RMS Nominal Power and 200 peak. Now, I know what peak is, I know what RMS is. But what does nominal mean? Secondly, isnt this kind of an odd combo of wattage handling for a speaker if nominal indeed means the same as RMS? A speaker that can handle 200 watts peak and only 10 watts RMS seems to be an unlikely pairing. These are the specs for my center channel that Im pushing with a 200 watt power amp. If it is in fact only 10 watts rms, then I would think that my 200 watt rms amp would be too much for this speaker. Am I missing something here??
Are you sure it's not 100 watts RMS? What speaker is this?
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post #4 of 10 Old 03-13-2013, 03:44 PM
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Quote:
Originally Posted by Daffypuck View Post

I hate the search engine on forums. They give you everything except what youre looking for. I hated to start a thread over a simple question, but I couldnt find jack on Google except ambiguous mumbo jumbo. I have a speaker that spec'd at 10 Watts RMS Nominal Power and 200 peak. Now, I know what peak is, I know what RMS is. But what does nominal mean?

I suspect that in this context 10 watts is the power they recommend to drive the speaker to an average comfortable listening level.
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Secondly, isnt this kind of an odd combo of wattage handling for a speaker if nominal indeed means the same as RMS?


I think that nominal refers to the operational circumstance - doing nominal average listening as opposed to running a dance party.
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post #5 of 10 Old 03-13-2013, 03:48 PM
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10 watts RMS at 8ohm? What model speaker is it? The RMS is typically 50% of the max rating, but like mentioned, max spec is usually just for marketing.

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post #6 of 10 Old 03-13-2013, 05:09 PM - Thread Starter
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It's an Infinity beta C360. I've just never seen specs that rated a speaker using nomi al wattage.
vanns.com/shop/servlet/item/features/548399041
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post #7 of 10 Old 03-13-2013, 05:29 PM
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Arny nailed it. On the Crutchfield website, it says, Power Range 10 to 200 watts. IOW, you can drive the speaker with as little as 10 watts, (but why would you?), or as much as 200 watts.

http://www.crutchfield.com/S-dr672tJ72MP/p_108BTC360B/Infinity-Beta-C360.html#details-tab

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post #8 of 10 Old 03-13-2013, 06:34 PM - Thread Starter
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Yeh, that's what I figured. It just confused me the way the Van s site had the specs listed.
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post #9 of 10 Old 03-14-2013, 10:28 AM
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The speaker has 91 dB sensitivity, so 10 watts minimum is believable.

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post #10 of 10 Old 03-14-2013, 10:47 AM
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It seems like speaker manufacturers define terms differently than an electrical engineer would. RMS current should be 70.7% of peak current or the half power point.
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