Loudspeaker Sensitivity

Re: Loudspeaker Sensitivity

Ivan Beaver said:
One of the "games" that some manufacturers like to play is as follows. Let's keep the same 100dB "middle" of the response. Now state the freq response as +/- 3dB. Now that gives a 6dB window. So if you subtract 6dB from 100dB-then that gives a "flat response that goes down to 94dB (100-6=94dB)

NOW let's give a -3dB number-which would be at 92dB-which is actually NINE dB below the stated sensitivity!!!!!!!!!!!!!!!!
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Ivan,

Just checking my understanding here, but wouldn't 100 +-3db be a six db window between 103 and 97. So, then the 3db down number would be 94? Still potentially deceiving, but not as drastic. I understand your point though that people seem to miss the fact that a spec given for +-3db is NOT the same as -3db, and neither one mean anything without a graph to reference them to.
 
Re: Loudspeaker Sensitivity

Brandon Wright said:
Ivan,

Just checking my understanding here, but wouldn't 100 +-3db be a six db window between 103 and 97. So, then the 3db down number would be 94? Still potentially deceiving, but not as drastic. I understand your point though that people seem to miss the fact that a spec given for +-3db is NOT the same as -3db, and neither one mean anything without a graph to reference them to.
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It really depends on how somebody "reads" the graph. I would "assume" that in the case I stated-they just "throw away" the peaks (since they are "free output").

Just look at the measured responses-particularly subs and see how much the difference is between the "stated" +/- 3 dB points (freq) are. They are MUCH greater than 6dB total.

For the typical sub-a real 6dB amplitude range is going to give a pretty small freq range-NOT what they want to publish.

Hence the reason to "look beyond" the simple numbers on the front of the spec sheet-and look at the measured response.

If you don't see a measured response-you have NO IDEA what the "simple numbers" really mean.
 
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