Equation / Graph to work out approximate frequency range at (-3db) ?
 

Hi all,
I've got a question for you all.

I've just got some speakers and the spec quotes:

1 x 10cm (Woofer)
1 x 6cm (Tweeter)

100 W/Din

65hz - 22Khz (-16db)
95hz - 20Khz (-10db)

81db /W (1.0m)

8 Ohms

Crossover @ 3.5Khz

Is there an easy way from the information above to work out an approximate
frequency range at (-3db) ?

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Regards,

Overlord.