 Re: Measuring power going to speakers?
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Joined: Apr 2005
Posts: 1,155
connoisseur
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connoisseur
Joined: Apr 2005
Posts: 1,155 |
Wid: that is not necessarily true. You are forgetting about the speaker's efficiency. In theory, a 4 ohm speaker could be "louder" than a 8 ohm speaker for the same input power.
Jake: I'm not quite sure what you are trying to say. But, the power distribution between the fronts, rears, rear surrounds is most probably NOT equal for any music composition. This may be even more profound when signal processing is used. I have been looking for relative distribution parameters but haven't found any. The bottom line is that it is highly unlikely that all of your channels would require either maximum peak or average power at the same time.
The Rat.
M80s, VP-150, QS8s,
SVS PC 20-39+, OPPO,
Onkyo 703s, Harmony 880
Sony 60" SXRD HDTV
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Re: Measuring power going to speakers?
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Joined: Jun 2003
Posts: 6,833
axiomite
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axiomite
Joined: Jun 2003
Posts: 6,833 |
This is true and I should have said of the same efficiency.
Rick
"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud
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Re: Measuring power going to speakers?
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Joined: May 2002
Posts: 10,654
shareholder in the making
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shareholder in the making
Joined: May 2002
Posts: 10,654 |
Jason, the actual formula for the dB relationship between two power levels is 10 log(P2/P1). For example, the log of 2 is about 0.3, so when power is doubled this results in 3dB more loudness. This is true regardless of whether the increase is from 1 watt to 2 watts, 10 watts to 20 watts, 100 watts to 200 watts, etc.
-----------------------------------
Enjoy the music, not the equipment.
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Re: Measuring power going to speakers?
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Joined: Dec 2003
Posts: 10,420
shareholder in the making
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shareholder in the making
Joined: Dec 2003
Posts: 10,420 |
Quote:
Jake: I'm not quite sure what you are trying to say. But, the power distribution between the fronts, rears, rear surrounds is most probably NOT equal for any music composition. This may be even more profound when signal processing is used. I have been looking for relative distribution parameters but haven't found any. The bottom line is that it is highly unlikely that all of your channels would require either maximum peak or average power at the same time.
Exactly, not equal for any music composition, its the music that dictates how much sound comes out of the speaker, so depending on what you are listening to, the power at each speaker will never be the same, constantly variable as I said before, which would be next to impossible to put a power figure on, except maximum and minimums. The power needs are always changing. You can take max and min readings for one disc/song and the next disc/song will have different readings.
But as you stated you are thinking more in terms of the power distribution of DSP settings and the amount they decide each speaker should have when in Jazz or Arena modes. I would bet that each manufactureer has their own set of parameters and they would be very hard to find. I guess you could try using a steady input source and then measure each speaker to see how much each gets during each mode.
And thanks for math lesson John. I can never remmeber those formulas for very long.
Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70
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Re: Measuring power going to speakers?
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Joined: Apr 2005
Posts: 1,155
connoisseur
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connoisseur
Joined: Apr 2005
Posts: 1,155 |
Well, the point that I was trying to make is that I strongly suspect that the power required for the fronts is much more than that required for the surrounds or rear surrounds for almost any music. The question is what is the relative ratio?
I may have to "borrow" a peak reading voltmeter and make some measurements myself.
The Rat.
M80s, VP-150, QS8s,
SVS PC 20-39+, OPPO,
Onkyo 703s, Harmony 880
Sony 60" SXRD HDTV
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Re: Measuring power going to speakers?
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Joined: Aug 2006
Posts: 213
local
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local
Joined: Aug 2006
Posts: 213 |
Quote:
I may have to "borrow" a peak reading voltmeter and make some measurements myself.
peak reading meter AKA oscilliscope 
i think rms x 1.44 = peak
i think most meters were at one time were designed for ~60 hz readings, but maybe they are accurate over a larger freq. range now.
hth
randy
Axiom M80, Ep600, Qs8, VP150, Crown XLI 2500 , DBX Driverack PA2, Focusrite Scarlet 2i4
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Re: Measuring power going to speakers?
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Joined: Apr 2005
Posts: 1,155
connoisseur
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connoisseur
Joined: Apr 2005
Posts: 1,155 |
I think that you need to review peak and RMS calculations as compared to both a sine wave and a complex signal!
The Rat.
M80s, VP-150, QS8s,
SVS PC 20-39+, OPPO,
Onkyo 703s, Harmony 880
Sony 60" SXRD HDTV
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Re: Measuring power going to speakers?
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Joined: Dec 2003
Posts: 10,420
shareholder in the making
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shareholder in the making
Joined: Dec 2003
Posts: 10,420 |
Quote:
Well, the point that I was trying to make is that I strongly suspect that the power required for the fronts is much more than that required for the surrounds or rear surrounds for almost any music. The question is what is the relative ratio?
I may have to "borrow" a peak reading voltmeter and make some measurements myself.
I still think that depends on the DSP and music. I like to listen in 6channel stereo and from my listening position with all speakers calibrated to the same levels (all speakers same distance from sweet spot and of the same type) they should all have the same power requirements, for the same note played through all the speakers, other wise why would the amps need the same amount of power for all channels? That would make the all channels driven spec a marketing ploy. My old Pro logic receiver had lower center channel and rear surround wattage than the front mains and it was impossible to get the speakers to equalize during play back.
Please do some testing, enquiring minds want to know. Well at least you and I.
Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70
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