Welborne Labs

Posted by Scholl on December 08, 2000 at 07:15:43:

I've been mulling over a fullrange loudspeaker design using the FE168 sigma in BR boxes and in calculating the QTS for a proper design I want to include Zo effects.

Is Zo measured by measuring Vout with and without a load and multiplying the differance voltage by the load current? On two amps I've measured this comes out to 6ohms.

Or is it calculated by plate resistance divided by square of turns ratio IE reflected impeadance? In both amps this comes out to about 2ohms.

Has anyone actualy measured or calculated Zo? This is a major factor for loudspeaker design as a 2ohm Zo increases Qts by .02-.07 or 10-25%.

Thanks, Scott