Instructables

Determining the correct specifications of my subwoofer?

I have purchased a local brand sub-woofer which does not comes with any specifications except the following:
Impedance: 4 Ohms
Output RMS:20 Watts
Frequency Response: 40Hz~170Hz
Effective Cone Diameter(D): 4"
However i wanted to know the following
Equivalent Volume(Vas)
Free Air Resonance (Fs)
Total Q (Qts)
Actual System Q (Qtc)
Resonance Frequency (Fb)
Is there is any way to determine these
Thanks in Advance....

mpilchfamily10 months ago
Not without the proper equipment to measure those characteristics.
adarshnarsaria (author)  mpilchfamily10 months ago
equipments like?
Like a sound proof chamber and proper audio testing equipment. Which would cost big bucks. It would be cheaper to get a nice set of speakers that already have that information on the box for you.