deepakchikane
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A dB rating is always referenced to something.
Let's say you choose 1 mW as your reference. Then an output of 1 mW would be 0 dBm.
Because we are talking power here, the equation to calculate how many dBm your example above is: 10*log(0.4232/0.001) = 26.26 dBm.
You need to know the efficiency of the speaker, which is usually give in sound dB (SPL) per watt at 1 meter from the speaker such as:
SENSITIVITY 1W/1m 82 dB
so 1W of power to the speaker input would generate an 82dB SPL sound level at 1 meter on axis from the speaker cone.
SPL is the sound level as measured by a calibrated sound meter.
The speaker sensitivity information is given by the speaker manufacturer.What are the steps to achieve it?
What is the selection criteria?
What need to take care?
The speaker sensitivity information is given by the speaker manufacturer.
Otherwise you would need to measure it with a sound meter.
Yes, that's all correct.My speaker datasheet states that..
SPL=99dB (+6dB/-2dB) at 1 meter (Anechoic) with 2.83Vrms input.
Does it means that at 1W it gives 99dB?
V=2.83V
R=8 OHM
P=V^2/R=(2.83^2)/R=1W
so for 0.5W it will give 99dB-3dB=96dB
0.25W=93dB
Does it means that at 1W it gives 99dB?
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