i'm confused ...

sss · 10th May 2006, 06:13 PM

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?

richie00boy · 10th May 2006, 06:21 PM

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.

noodle_snacks · 10th May 2006, 11:20 PM

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)

sss · 10th May 2006, 11:40 PM

i got a horn in the alarm system that says 125db...

so thats bs i guess , right?

lndm · 11th May 2006, 12:55 AM

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).

nunayafb · 11th May 2006, 01:03 AM

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.

10th May 2006, 06:13 PM	#1
sss diyAudio Member Join Date: Jul 2003 Location: Israel , haifa	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? __________________ if you are not living on the edge you are taking too much space

10th May 2006, 06:21 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	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. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

10th May 2006, 11:40 PM	#4
sss diyAudio Member Join Date: Jul 2003 Location: Israel , haifa	i got a horn in the alarm system that says 125db... so thats bs i guess , right? __________________ if you are not living on the edge you are taking too much space

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10th May 2006, 11:20 PM	#3
noodle_snacks diyAudio Member Join Date: Mar 2004 Location: Hobart, Tasmania	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)

11th May 2006, 12:55 AM	#5
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	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).

11th May 2006, 01:03 AM	#6
nunayafb diyAudio Member Join Date: Aug 2005	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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