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#1 |
diyAudio Member
Join Date: Jan 2004
Location: MO
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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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#2 |
diyAudio Member
Join Date: Apr 2011
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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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#4 |
diyAudio Member
Join Date: Jan 2004
Location: MO
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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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#5 |
diyAudio Member
Join Date: Nov 2010
Location: Bogor
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5.77Vpp is 2V RMS.
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#6 |
diyAudio Member
Join Date: Dec 2009
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Last edited by OldDIY; 20th January 2021 at 07:35 PM. |
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#7 |
diyAudio Member
Join Date: Jan 2004
Location: MO
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You are right. Used the wrong calculator and put 5.70v as Vmax instead of Vpp.
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#8 |
diyAudio Member
Join Date: Feb 2017
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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) } several synchro-posts!
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#9 |
diyAudio Member
Join Date: Feb 2017
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If Vmax is 5.7, then what is Vmin? 0.0V? Then it's still 2Vrms.
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#10 |
diyAudio Member
Join Date: Jan 2004
Location: MO
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I believe the calculator assumes that Vmin would be negative 5.7v, i.e., Vmax is half of Vpp.
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