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Old 13th January 2013, 08:36 PM   #21
Blues is offline Blues  United States
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-12dB of 2V is 0.5V, I have not encountered this low even on older recordings on CD remastered from analog.

I have a recording, Jimmy Rogers' Bluebird, that peaks at a low 0.88Vrms and SPL is not wanting more on headphones. Most of my CDs average peaks of 1.1 to 1.2Vrms...MJ's remastered Thriller tops it at 1.424Vrms. Lower than these are mostly from older recordings but most are coming out now remastered to the proper line levels.

Last edited by Blues; 13th January 2013 at 08:43 PM.
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Old 17th January 2013, 11:58 AM   #22
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Hi guys !

I've create a google doc for calculating the power needed to reach an audio level for some headphone.

I'm also able to calculate the maximum dB for a specific headphone and a specific amp (caracterised by its maximum voltage and current output signal)

It might be helpful for some people, so i share it :
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Old 18th January 2013, 11:52 AM   #23
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I like your document better than mine. I will share mine because it makes it easy to convert dB/mW to dB/V. That's math I'd rather have Excel perform than to have to constantly remember exactly how to calculate it.

Also, I relied heavily on manufacturer specs whereas you chose the better route of using lab-measured results. But download it and mess around with the Max dB (Cell M1) and I believe it will be a revelation to many how little power it takes to go too loud (beyond 80dB). I also have a condition set to colorize any current requirements beyond 25mA because it seems to be at or near the practical limit for many OpAmps so it requires special consideration when building an amp or buffer.

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Old 18th January 2013, 12:55 PM   #24
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I like that we can directly visualise the sensitivity of the headphone in dB/mW and dB/V. I may add this data in my doc.

Our results are quite similar (the error is due to the spec/experimental data of impedance and sensitivity)

Just one thing : Your max current is compute from Vrms value. So the result is Irms and you need to multiply it by sqrt(2) to get the pic value. (spec of AOP is for absolute maximum output, so pic current (+/- pic current))
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Old 18th January 2013, 02:40 PM   #25
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Thanks for catching that. I just changed it to reflect V(rms) and I(Aop).

Last edited by ethanolson; 18th January 2013 at 02:45 PM.
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