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Re: Amps and Power, for Micah
free2day33611 #313041 07/02/10 12:35 AM
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i don't know that i follow your last statement, in comparing with the source?

Re: Amps and Power, for Micah
dakkon #313042 07/02/10 12:44 AM
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I just meant different source material. Listening to the same material if comparing since different CD's or DVD's would require different power.

Re: Amps and Power, for Micah
free2day33611 #313048 07/02/10 01:47 AM
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that doesn't matter so much... if you are talking about a DVD-A or a SACD, those are mutichannel sources. so that would make things change. but going specifically from a 2 channel CD to a 2 channel DVD. the DVD will hold more information, so should "sound" better because there is more data, so the digital to analog converters in your receiver can make the digital signal much more closely resemble an analog signal.

This is why people still like records, its an analog source, to and analog output...
at the end of the day, our eyes and ears work in an analog environment, so anything digital HAS to be converted to analog for the human body to be able to interoperate it..

i don't know if this explanation helps any or not. hopefully it does.

Re: Amps and Power, for Micah
free2day33611 #313051 07/02/10 02:22 AM
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Originally Posted By: free2day33611
The Denon rating is for 2 channels? If you are running a 7.1, the power to the fronts is reduced due to all the speakers, correct? So the Emotiva XPA-3 would be increasing more comparing 7 speakers, correct?

I don't think that matters in that, whether you use two speakers or 8 speakers to generate 115db peaks, it will take the same number (or very close to) of watts.


Fred

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Re: Amps and Power, for Micah
free2day33611 #313058 07/02/10 02:47 AM
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Free, welcome. As you probably have now gathered, no, the power to the fronts isn't necessarily reduced. All channels being driven simultaneously at full power is a laboratory test, but essentially never happens in listening at home and a rating based on all channels is rather unrealistic. Typically one or two channels are using much more power than the others, even if all are in operation.


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Re: Amps and Power, for Micah
fredk #313059 07/02/10 02:53 AM
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Fred, keep in mind that if you have two speakers instead of one(four instead of two, etc.)playing the same sound, to keep the overall sound at the same dB level, the power used by each speaker would be reduced by half.


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Re: Amps and Power, for Micah
JohnK #313060 07/02/10 02:54 AM
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http://www.youtube.com/watch?v=PSdHf6yozyc

this is actually a really good lecture on how an amplifyer works, im about 30min though it now, while i get ready for tomorrow.... If you watch this whole lecture you should be good to go for amp design/operation.....

Re: Amps and Power, for Micah
JohnK #313068 07/02/10 04:10 AM
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Originally Posted By: JohnK
Fred, keep in mind that if you have two speakers instead of one(four instead of two, etc.)playing the same sound, to keep the overall sound at the same dB level, the power used by each speaker would be reduced by half.

I think that is what I was trying to say.


Fred

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Re: Amps and Power, for Micah
fredk #313108 07/02/10 02:19 PM
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How about multi channel stereo? I personally don't like it, so was never all the curious to how you get 7 channel stereo out of 2 channel, but if you wanted to really test a multi channel amp out, would this function do it? Now that I'm thinking about it, how does this multi channel stereo funtion work?

Re: Amps and Power, for Micah
michael_d #313110 07/02/10 02:24 PM
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I think multi-channel stereo just sends the left signal to all the left speakers and the right signal to all the right speakers, then mixes the signal for the center. It's probably the toughest mode on a multi-channel receiver, I'm guessing.


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