if a power amp has 24db of gain, what is it's input voltage sensitivity for full 90w output.
90W into 8R --> VxV/8R=90 W --> V= 26.8V output voltage at 90W
Gain=24dB --> 24=20 x log(26.8/Vin) --> Vin= 1.69V input voltage for full output voltage/power
All voltages in Vrms.
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Incomplete question, you did not mention load impedance.Just to prove to my friend if a power amp has 24db of gain, what is it's input voltage sensitivity for full 90w output, he's watching
Cheers George
Without that, any answer is just a guess.
Unless it includes "all answers", meaning a sensitivity vs. impedance table.
Incomplete question, you did not mention load impedance.
Without that, any answer is just a guess.
Unless it includes "all answers", meaning a sensitivity vs. impedance table.
90w 8ohms
Cheers George
Incomplete question, you did not mention load impedance.
Without that, any answer is just a guess.
Or you assume the customary 8 ohms, as Ray did.
Andy
Rayma guessed the speaker impedance correctly and gave the correct answer for full power sensitivity.
Vmax = sqrt(max power * Speaker Impedance) = sqrt (90*8) = 26.8Vac
Gain factor = invLog(dBgain / 20) = inLog(24/20) = 15.85
Sensitivity = Vmax / Gain factor = 26.8/15.85 = 1693mVac
Any CDP and similar digital source will need to be attenuated to prevent the amplifier from clipping.
Vmax = sqrt(max power * Speaker Impedance) = sqrt (90*8) = 26.8Vac
Gain factor = invLog(dBgain / 20) = inLog(24/20) = 15.85
Sensitivity = Vmax / Gain factor = 26.8/15.85 = 1693mVac
Any CDP and similar digital source will need to be attenuated to prevent the amplifier from clipping.
This might be a good place for you to start. Elliott Sound Products - Audio Power Amplifier Design Guidelines It's difficult to know what to recommend without knowing more about what you do and don't know. But I hope this is helpful and there is a lot more information on ESP pages for all levels
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