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Multi-Way Conventional loudspeakers with crossovers

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Old 10th May 2006, 05:13 PM   #1
sss is offline sss  Israel
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Default i'm confused ...

i got this table :
power vs SPL
1watt = 90dB (before cabin gain)
2 = 93
4 = 96
8 = 99
16 = 102
32 = 105
64 = 108
128 = 111
256 = 114
512 = 117
1024 = 120
2048 = 123
4096 = 126

now , if i got a 16W speaker , it can make 102db spl ...
my question is , at what frequency?
does this mean the spl is the same for all 20-20k freq range?
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Old 10th May 2006, 05:21 PM   #2
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No the 90dB you have been quoted can either be a wideband white noise signal, or more likely, a really high point in the frequency range to give an exaggerated sensitivity figure.

Once you factor in that in the bass region you are on the roll-off curve it all goes down anyway.

Also the SPL at the bass end will depend on your specific box design and can vary hugely.
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Old 10th May 2006, 10:20 PM   #3
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bearing in mind that power compression etc isn't taken into account, or cone excursion then a better equation to use would be:

efficiency+10log(power) eg 90+10log(16)
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Old 10th May 2006, 10:40 PM   #4
sss is offline sss  Israel
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i got a horn in the alarm system that says 125db...
so thats bs i guess , right?
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Old 10th May 2006, 11:55 PM   #5
lndm is offline lndm  Australia
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The horn is probably optimised for a limited frequency range. 125dB is probably the maximum (anyway, it is probably meant to be used at one level only).
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Old 11th May 2006, 12:03 AM   #6
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If you have the T/S parameters, this link http://www.adireaudio.com/Files/Tech...lculations.pdf
will help you find the actual reference efficiency, although like mentioned there will still be many variations.
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