In Reply to: Re: based on my vast experience with 2 boxes:) posted by Adam on April 27, 2002 at 09:12:04:
need to identify three freq.s using a z plot test setup. The lower peak is Fl, the upper peak is Fh, assuming a vented reflex enclosure. Then Fc, a single peak is found with the port sealed. Fb = sq.rt.[Fl^2+Fh^2-Fc^2] Fb is the box tuning of the whole system, after all is said and done.
A 'scope can also be used, the elipse will go into a flat line at Fb. Of course, your accuracy depend upon your sig gen calibration, that's life...but the sig gen cal can be verified against line freq (60Hz), so how far off will you be to either side...not much. Sam
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