Hi, I compiled table from InnerFidelity Headphone Data Sheet page publicly available on internet.
>>>Headphone Data Sheet Table with power, voltage & current<<<
In table are power, voltage & current requirements for 90, 100, 105, 110, 115 dbSPL for over 400 headphones. Table are sortable and "filterable".
I hope this can be useful for folks here.
>>>Headphone Data Sheet Table with power, voltage & current<<<
In table are power, voltage & current requirements for 90, 100, 105, 110, 115 dbSPL for over 400 headphones. Table are sortable and "filterable".
I hope this can be useful for folks here.
That table is very instructive.
Notice that 25 mW will get you at least 100 dB with most of the listed headphones.
Notice that 25 mW will get you at least 100 dB with most of the listed headphones.
Well, at 100 dBSPL, only 5 mW is enough for 402 headphones and not enough for 60 headphones from the table. 🙂
Indeed.
My point is that mobile equipment provides enough power for earsplitting volume with typical popular consumer headphones. Mouser has a bunch of SMD headphone amps that run off of 3 volts (or less for some) and they all seem to deliver 25 mW. I suppose that similar devices are what's inside our mobile devices. 25 mW has become an industry standard for consumer grade mobile devices, it seems to me.
That being said, I am trying to pick from several different headphone amp circuits that I have been working on, and even the least powerful one still delivers around 250 mW into 32 ohms. 🙂 Of course my goals don't include running off a battery; I want something that can drive virtually any headphone (except electrostatics) of any impedance and efficiency.
Chart time!
Chart time!
>>>115 dB SPL Chart<<<
Two graphs at 115 dB SPL, limited&whole range (click on tabs down-left)
x=voltage y=current bubble_color=headphone_type bubble_size=Impedance
Enjoy&comment!!
Chart time!
>>>115 dB SPL Chart<<<
Two graphs at 115 dB SPL, limited&whole range (click on tabs down-left)
x=voltage y=current bubble_color=headphone_type bubble_size=Impedance
Enjoy&comment!!
Old head-fi headphone sensitivity spreadsheet - I converted to OpenOffice - no promises about accuracy, macro correctness...
post #21470: http://www.diyaudio.com/forums/loun...ch-preamplifier-part-ii-2147.html#post2950960
can find a few tries at head-fi http://www.head-fi.org/newsearch?ad...&order=descending&Search=SEARCH&Search=SEARCH
post #21470: http://www.diyaudio.com/forums/loun...ch-preamplifier-part-ii-2147.html#post2950960
can find a few tries at head-fi http://www.head-fi.org/newsearch?ad...&order=descending&Search=SEARCH&Search=SEARCH
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Very nice! I have been trying to decide what voltage and current capability I need for a headphone amp to be considered 'universal'.
It turns out to be an impossible problem, so a reasonable compromise must be made. I am thinking about 100mA peak and 12V peak. (8.5Vrms, 70.7 mArms) Obviously this does not support all headphones, but it gets most.
I have AKG K701 right now. The chart shows it requires 84 or 88 mA to get to 115 dB SPL, but the specs say they are 200 mW max, so 55 mA should be the maximum for them.
It looks like I might be wise to up the current limit a bit though.
One question...
What does the size of the circles in the 115dB plot represent? Ohms?
Terry
It turns out to be an impossible problem, so a reasonable compromise must be made. I am thinking about 100mA peak and 12V peak. (8.5Vrms, 70.7 mArms) Obviously this does not support all headphones, but it gets most.
I have AKG K701 right now. The chart shows it requires 84 or 88 mA to get to 115 dB SPL, but the specs say they are 200 mW max, so 55 mA should be the maximum for them.
It looks like I might be wise to up the current limit a bit though.
One question...
What does the size of the circles in the 115dB plot represent? Ohms?
Terry
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