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Unity-gain "amp" for high-efficiency speakers
Unity-gain "amp" for high-efficiency speakers
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Old 20th January 2021, 06:33 PM   #1
mudihan is offline mudihan  United States
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Default Unity-gain "amp" for high-efficiency speakers

Has anyone tried using a unity-gain "amp" with, say, 8A current output capacity (essentially just a buffer stage) to drive high-efficiency full-range speakers (say, 100db sensitivity) out of your typical DACs with a solid 2v output? I.e., the set up would be just a digital source with a 2v output ==> high-current buffer ==> crossover-less, high-efficiency, full-range speakers.

I am considering using a buffer as way to minimize noise and simplify/shorten signal path. But I am not sure whether the lack of any voltage gain will work in terms of plain loudness and musical dynamics.
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Old 20th January 2021, 06:38 PM   #2
rayma is online now rayma  United States
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The 2Vrms output on an 8R speaker would be 1/2 W, and only 1/4 A current.
No need for much of a buffer, it would be voltage limited.
You'd likely still need some voltage gain.

Last edited by rayma; 20th January 2021 at 06:45 PM.
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Old 20th January 2021, 07:13 PM   #3
woody is offline woody
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Unity-gain "amp" for high-efficiency speakers
Well here are 2 designs for that the FAOW and the MOFO. Here is a link to the FAOW.

FAOW
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Old 20th January 2021, 07:17 PM   #4
mudihan is offline mudihan  United States
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Quote:
Originally Posted by rayma View Post
The 2Vrms output on an 8R speaker would be 1/2 W, and only 1/4 A current.
No need for much of a buffer, it would be voltage limited.
You'd likely still need some voltage gain.
Thanks. Very informative. I just found out that my DAC has Vpp of 5.7v at full scale output, which appear to translate to 4Vrms. I think I may be in the real low end of the doable zone.
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Old 20th January 2021, 07:21 PM   #5
indra1 is offline indra1  Indonesia
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5.77Vpp is 2V RMS.
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Old 20th January 2021, 07:25 PM   #6
OldDIY is online now OldDIY
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Click the image to open in full size.#2734
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Old 20th January 2021, 07:27 PM   #7
mudihan is offline mudihan  United States
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Originally Posted by indra1 View Post
5.77Vpp is 2V RMS.
You are right. Used the wrong calculator and put 5.70v as Vmax instead of Vpp.
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Old 20th January 2021, 07:29 PM   #8
U230421 is offline U230421
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5.7Vpp renders approx 2.0Vrms. You need a bridge to reach 3.8Vrms.
{ 5,7pp = 2.85p => * 0.707 = 2.0Vrms (sine wave) }


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Old 20th January 2021, 07:31 PM   #9
U230421 is offline U230421
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If Vmax is 5.7, then what is Vmin? 0.0V? Then it's still 2Vrms.
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Old 20th January 2021, 07:33 PM   #10
mudihan is offline mudihan  United States
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Quote:
Originally Posted by MarsBravo View Post
If Vmax is 5.7, then what is Vmin? 0.0V? Then it's still 2Vrms.
I believe the calculator assumes that Vmin would be negative 5.7v, i.e., Vmax is half of Vpp.
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