![](/boards/images/icons/default/book.gif) Re: A1400-8
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Joined: Jan 2004
Posts: 13,846 Likes: 13
shareholder in the making
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shareholder in the making
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Posts: 13,846 Likes: 13 |
So why does Axiom and others call their amps a digital design?
M80s VP180 4xM22ow 4xM3ic EP600 2xEP350 AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85
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![](/boards/images/icons/default/book.gif) Re: A1400-8
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Joined: Jan 2007
Posts: 10,493 Likes: 116
shareholder in the making
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shareholder in the making
Joined: Jan 2007
Posts: 10,493 Likes: 116 |
Good question. I don't know the history of that one. Maybe it has to do with the fact that the FETs turn on and off really fast so for slang they call it "digital".
House of the Rising Sone Out in the mid or far field Dedicated mid-woofers are over-rated
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![](/boards/images/icons/default/book.gif) Re: A1400-8
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Joined: Jan 2007
Posts: 10,493 Likes: 116
shareholder in the making
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shareholder in the making
Joined: Jan 2007
Posts: 10,493 Likes: 116 |
The A1400's efficiency is proportional to the power sourced from it. So for me playing at a half watt, it's probably as efficient as a lightbulb ![smile \:\)](/boards/images/graemlins/default/smile.gif) .
House of the Rising Sone Out in the mid or far field Dedicated mid-woofers are over-rated
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![](/boards/images/icons/default/book.gif) Re: A1400-8
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Joined: Oct 2006
Posts: 6,955
axiomite
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axiomite
Joined: Oct 2006
Posts: 6,955 |
I didn't think light bulbs were all that efficient. They shed a lot of heat. Sorry, I have no real point here. When I'm overtired my brain woks in odd ways. ![crazy](/boards/images/graemlins/default/crazy.gif)
With great power comes Awesome irresponsibility.
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![](/boards/images/icons/default/book.gif) Re: A1400-8
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Joined: Jan 2007
Posts: 10,493 Likes: 116
shareholder in the making
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shareholder in the making
Joined: Jan 2007
Posts: 10,493 Likes: 116 |
That's right Murph. I don't know how efficient a lighbulb is exactly but it's probably less than 10%.
House of the Rising Sone Out in the mid or far field Dedicated mid-woofers are over-rated
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![](/boards/images/icons/default/book.gif) Re: A1400-8
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Joined: Feb 2007
Posts: 43
buff
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buff
Joined: Feb 2007
Posts: 43 |
Not sure if the amp utilizes this or not but I think it explains where the digital in Pule width modulation comes from http://www.embedded.com/story/OEG20010821S0096
M80,VP150,QS8,ERD-1,XPA-2,XPA-5,UMC-10,PS3,XBOX360,Dish VIP622,PB13 Ultra,Panasonic PT-AE3000U
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![](/boards/images/icons/default/book.gif) Re: A1400-8
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Joined: Feb 2007
Posts: 43
buff
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buff
Joined: Feb 2007
Posts: 43 |
also found this really technical guide to the Basics of class D amplifiers http://www.irf.com/technical-info/appnotes/an-1071.pdf
M80,VP150,QS8,ERD-1,XPA-2,XPA-5,UMC-10,PS3,XBOX360,Dish VIP622,PB13 Ultra,Panasonic PT-AE3000U
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![](/boards/images/icons/default/book.gif) Re: A1400-8
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Joined: May 2002
Posts: 10,654
shareholder in the making
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shareholder in the making
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The International Rectifier discussion is excellent, but the embedded link doesn't use the term "digital" in the generally accepted manner, and some might say is simply incorrect. Pulse Width Modulation of a continuous analog waveform doesn't involve any digital sampling, and although the max/min appearance of the PWM waveform has been said to be "digital-like" in appearance, it's still just a modulated continuous analog waveform. The analog waveform "concealed" within the PWM waveform is revealed when the low-pass filter removes the PWM frequency and its harmonics, leaving the original analog waveform.
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Enjoy the music, not the equipment.
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![](/boards/images/icons/default/book.gif) Re: A1400-8
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Joined: Jan 2007
Posts: 10,493 Likes: 116
shareholder in the making
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shareholder in the making
Joined: Jan 2007
Posts: 10,493 Likes: 116 |
Yeah, that's right. I think some marketeer called this "digital" to be "hip" with the times. That's the difference between architecture and marchitecture ![smile \:\)](/boards/images/graemlins/default/smile.gif) .
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