Compressor specification for alu chip blower

[Jonathan]

Half the actual acoustic output is a 6dB drop

Half is surely -3dB as log(3)=0.48.

Either way, no distances specified for these measurements so they don't really mean much without making assumptions. Plus the frequency response of the human ear isn't flat, so if one operates at a higher speed that would make a difference...

[Ricardoco]

Half is surely -3dB as log(3)=0.48.

Either way, no distances specified for these measurements so they don't really mean much without making assumptions. Plus the frequency response of the human ear isn't flat, so if one operates at a higher speed that would make a difference...

From my point i was talking dbm, as i thought everyone was but still it is right to clarify this, the difference with my workshop is i can hear 80dbm outside quite clearly, i can also hear 40dbm outside, but hardly.

Rick

[Shinobiwan]

Half is surely -3dB as log(3)=0.48.

No its 6dB for half the sound pressure output. Consider it the otherway around and you get the idea ie. 3dB increase is only half rather than double.

Plus the frequency response of the human ear isn't flat, so if one operates at a higher speed that would make a difference...

Not only that but also with a higher mean sound pressure level there is some compression of this. The fletcher munson curve is the commonly accepted equal loudness curve used to describe the frequency response of the ear when considered as a transducer.

[Jonathan]

No its 6dB for half the sound pressure output.

Fair enough - at first you said 'acoustic output' which I took to mean acoustic power (which would be 3dB) not sound pressure, which as you say it 6dB for twice as loud (when neglecting our ear's response) which is a more meaningful comparison in this context.