Driver Power Calculation

GOWA · 11th November 2007, 03:25 PM

I am thinking of using Fostex FE108E¢² 4" FULL RANGE Sigma Series but crossing it at about 1000 Hz. It is rated at 1W / 1m 90 dB. Nom. Power 24 Watts
What would the power rating be at that point?

Znom 8 ohm
Re 6.8 ohm
Le@1kHz .038 mH
fs 77 Hz
Qms 7.79
Qes 0.32
Qts 0.3
Mms 2.7 g
Cms 1.59 mm/N
Sd 0.005 m2
BL 5.2 N/A
Vas 5.7 ltrs
Xmax 0.28 mm peak
VC ¨ª 20 mm
http://www.madisound.com/catalog/pro...roducts_id=268

AndrewT · 11th November 2007, 03:57 PM

24W.
but is that continuous or peak or intermittant or ?

24W is about 14dbW.
add that to 90db/w/m and you get a maximum of about 104db/m
subtract 8db for a sensible listening distance and add 3db for a pair. and you have a maximum average listening SPL of about 79db.
Not too bad for a little 4inch driver.
But it won't produce much bass volume.

sreten · 12th November 2007, 09:40 AM

Hi,

Very approximately with 1kHz c/o point about 1/3 full power.
(Depends on the type of music - amount of bass power.)
That is around 75W continuous weighted noise type signal.

In practice music is dynamic not continuous, so a long as
the amplifier is not driven deep into clipping I'd say power
handling would be around 150W unclipped programme.

/sreten.

11th November 2007, 03:25 PM	#1
GOWA diyAudio Member Join Date: Jan 2007 Location: Ontario	Driver Power Calculation I am thinking of using Fostex FE108E¢² 4" FULL RANGE Sigma Series but crossing it at about 1000 Hz. It is rated at 1W / 1m 90 dB. Nom. Power 24 Watts What would the power rating be at that point? Znom 8 ohm Re 6.8 ohm Le@1kHz .038 mH fs 77 Hz Qms 7.79 Qes 0.32 Qts 0.3 Mms 2.7 g Cms 1.59 mm/N Sd 0.005 m2 BL 5.2 N/A Vas 5.7 ltrs Xmax 0.28 mm peak VC ¨ª 20 mm http://www.madisound.com/catalog/pro...roducts_id=268 __________________ Website

11th November 2007, 03:57 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	24W. but is that continuous or peak or intermittant or ? 24W is about 14dbW. add that to 90db/w/m and you get a maximum of about 104db/m subtract 8db for a sensible listening distance and add 3db for a pair. and you have a maximum average listening SPL of about 79db. Not too bad for a little 4inch driver. But it won't produce much bass volume. __________________ regards Andrew T.

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12th November 2007, 09:40 AM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Very approximately with 1kHz c/o point about 1/3 full power. (Depends on the type of music - amount of bass power.) That is around 75W continuous weighted noise type signal. In practice music is dynamic not continuous, so a long as the amplifier is not driven deep into clipping I'd say power handling would be around 150W unclipped programme. /sreten.

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