j-curve
100+ Head-Fier
- Joined
- Apr 15, 2002
- Posts
- 489
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- 11
Headphone efficiency has been quoted in dB/mW ever since headphones were invented, hasn't it? Probably a good idea too, because it was fairly easy to calculate how much power you were going to need. It also allowed manufacturers to compete on a meaningful basis, improving efficiency with better designs, stronger magnets, lighter diaphragms, etc.
Recently there has been a move by Sennheiser and AKG to abandon the traditional measurement and quote sensitivity in dB/V instead. This could be an even better idea, because amplifiers are primarily voltage devices, and now we have a number which doesn't require a tertiary qualification in electronics to figure out how loud our headphones will sound. The downside is that if manufacturers compete on dB/V sensitivity, there will be an inevitable trend to lower impedance headphones, and we'll hear background hiss every time we plug into any source.
In the meantime, we have two different standards for specifying loudness, neither of which is definitive because it can still depend on the output impedance of the amplifier, and whether or not the headphones you're comparing will be plugged into the source at the same time or one after the other.
What started as a list of a handful of 'phones has become a database which I'd like to share with fellow Head-Fiers. These are two Excel files which have been zipped to meet the 25kB size limit on attachments. Both contain macros so I've scanned them at virusscan.jotti.org before posting.
One is the database. The other is a utility for calculating maximum SPL for given phones and amplifier.
Please let me know of any significant omissions or errors.
MD5 Checksum info:-
Sensitivity.zip 9c171822e593bbcbe6aaf338a6b9cb8b
Sensitivity.xls 3fbec765547cf9a88a8eb126c791d305
MaxSPL.zip a7e01b48456bfed455f8e0f67e13505b
MaxSPL.xls a4da9074675e3bf697cd264921b74697
Edit: Replaced Senstivity.zip, incorporating changes contributed by Iron_Dreamer and sgrossklass, and adding Sony V6 & V9.
Recently there has been a move by Sennheiser and AKG to abandon the traditional measurement and quote sensitivity in dB/V instead. This could be an even better idea, because amplifiers are primarily voltage devices, and now we have a number which doesn't require a tertiary qualification in electronics to figure out how loud our headphones will sound. The downside is that if manufacturers compete on dB/V sensitivity, there will be an inevitable trend to lower impedance headphones, and we'll hear background hiss every time we plug into any source.
In the meantime, we have two different standards for specifying loudness, neither of which is definitive because it can still depend on the output impedance of the amplifier, and whether or not the headphones you're comparing will be plugged into the source at the same time or one after the other.
What started as a list of a handful of 'phones has become a database which I'd like to share with fellow Head-Fiers. These are two Excel files which have been zipped to meet the 25kB size limit on attachments. Both contain macros so I've scanned them at virusscan.jotti.org before posting.
One is the database. The other is a utility for calculating maximum SPL for given phones and amplifier.
Please let me know of any significant omissions or errors.
MD5 Checksum info:-
Sensitivity.zip 9c171822e593bbcbe6aaf338a6b9cb8b
Sensitivity.xls 3fbec765547cf9a88a8eb126c791d305
MaxSPL.zip a7e01b48456bfed455f8e0f67e13505b
MaxSPL.xls a4da9074675e3bf697cd264921b74697
Edit: Replaced Senstivity.zip, incorporating changes contributed by Iron_Dreamer and sgrossklass, and adding Sony V6 & V9.