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sensitivity question

A few questions regarding sensitivity.
a speaker with 90db sensitivity means roughly that it will deliver 90db at one meter distance at 1W right?
But if I’m not wrong most speakers are emitting more sound towards the drivers direction. In some way they resemble a light bulb+projector which emits light toward one specific direction. Obviously with speakers the "projector" effect is not as pronounced as with a lighting projector however the sound is mainly emitted toward one specific direction. With light bulbs which have a projector, in order to describe correctly the emitted luminous flux, you have to add the light cone degrees. In fact a spot light which opens one degree and consumes one watt delivers at one meter more lux as a light bulb of 100W at one meter which opens 180 degrees.
Wen measuring the sensitivity of a speaker do they measure only the db at one meter from the front of the speakers or do they make 8 or more measurements at 1 meter around the speaker and calculate then the medium sensitivity? If not is the actual sensitivity measurement not strongly lacking in accuracy? And in a audiophile world which has measurements in such a high regard is that lack in accuracy not wired? Thanks for any info!
128x128daros71

Showing 1 response by oldhvymec

oldhvymec
5,101 posts
 
Subjective if it is, subjective. It's not. The criteria for accurate measurements only need be noted as a 4 6 or 8 ohm voice coil.

WHERE the mic is placed and the fact that it is calibrated. That is the data we look for. The way to take measurement is to note HOW you did it. Should note temps, humidity and any other features. LIKE the ROOM.
The best place is at night in the open back yard...

The space the driver is in has nothing to do with it's POTENTUAL to perform in ANOTHER given space.. I think you're mixing up what a driver can do with what a drive IS doing...

Erik explained off axis response is just that. The better question is does it effect YOUR sweet spot because of it or the lack of it.. Off axis response that is...  Wouldn't YOU have to be OFF axis to hear the difference. No ones moving in a listening room.. If they were it would be a BALL room. AY?
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