Re: Is my hk powerful enough
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Joined: May 2003
Posts: 18,044
shareholder in the making
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shareholder in the making
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I think we need some equations here.
I am the Doctor, and THIS... is my SPOON!
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Re: Is my hk powerful enough
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Joined: Mar 2005
Posts: 7,463 Likes: 1
axiomite
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axiomite
Joined: Mar 2005
Posts: 7,463 Likes: 1 |
Brownies + chocolate frosting= happy stomach.
*********** "Nothin' up my sleeve. . ." --Bullwinkle J. Moose
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Re: Is my hk powerful enough
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Joined: Aug 2007
Posts: 3,488 Likes: 9
connoisseur
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connoisseur
Joined: Aug 2007
Posts: 3,488 Likes: 9 |
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Re: Is my hk powerful enough
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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 |
Ken, lets try the form of Ohm's Law relating power to voltage and resistance: P=V(squared)/R. So, 1(watt)=2.83 volts(squared)/8ohms. Any number of watts or volts can be used in the measurement as long as the result is stated in terms of the usual standard, equivalent to 1 watt.
-----------------------------------
Enjoy the music, not the equipment.
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Re: Is my hk powerful enough
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Joined: Apr 2007
Posts: 4,877
connoisseur
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connoisseur
Joined: Apr 2007
Posts: 4,877 |
ohms law is one of the very few things I actually remembered from my electric circuits class. Still haven't figured out why that class is required for civil engineers...?
On the fundamentals of engineering exam I could answer all of the ohms law problems and converting resistors in parralel and series into single eq. resistor easily
Anything that said AC and had a sine wave I guessed c!
Last edited by terzaghi; 11/20/07 04:04 AM.
-David
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Re: Is my hk powerful enough
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Joined: Jan 2007
Posts: 10,490 Likes: 116
shareholder in the making
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shareholder in the making
Joined: Jan 2007
Posts: 10,490 Likes: 116 |
Why did I have to take mechanics and dynamics (which I loved by the way)?
Rick, my cheap and dirty way of measuring sensitivity here at home is to inject a 50Hz signal into the M80 with a 2 Volt average value and then measure the SPL. Why 2 Volts? Because at 50Hz, the M80s impedance is bang on 4 Ohms according to the charts. 2V across 4 Ohms yields a power of 1 watt. (To verify that this is indeed the impedance I could measure the current but I haven't done that.)
Now as I'm writing this I'm thinking that perhaps 50Hz is not a great value for rooms like ours. I should probably use 500Hz or above to get away from room effects.
Anyway, an important point here is that Soundstage averaged the SPL from 300Hz to 3KHz. What frequencies did Axiom use? Maybe Axiom went down to 80Hz which is approximately the limit of anechoic chambers. Axiom did their tests anechoically; did Soundstage? Or did they do them semi-anechoically?
House of the Rising Sone Out in the mid or far field Dedicated mid-woofers are over-rated
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Re: Is my hk powerful enough
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Joined: May 2003
Posts: 18,044
shareholder in the making
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shareholder in the making
Joined: May 2003
Posts: 18,044 |
I am the Doctor, and THIS... is my SPOON!
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Re: Is my hk powerful enough
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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
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I always thought the tests the were usually done with a 1khz signal?
Jason M80 v2 VP160 v3 QS8 v2 PB13 Ultra Denon 3808 Samsung 85" Q70
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Re: Is my hk powerful enough
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Joined: Jun 2003
Posts: 6,833
axiomite
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axiomite
Joined: Jun 2003
Posts: 6,833 |
Ok, though I didn't have a lot of coffee this moring I think the article from EFalardeau and Johns explanation clears things up. It isn't a matter of the numbers used as long as the end result equals 1w @ 1m and this can be done in a number of fashions.
Rick
"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud
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Re: Is my hk powerful enough
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Joined: Aug 2007
Posts: 3,488 Likes: 9
connoisseur
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connoisseur
Joined: Aug 2007
Posts: 3,488 Likes: 9 |
Exactly. Coffee sounds like a good idea, actually. I think mine is ready! (BTW, it is now officially winter in Montreal; we are having our first snow storm... too bad I am running out of excuse to stay home with my speakers... kidding! I still have plenty of excuses).
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