Posted by Damir [ 213.202.85.193 ] on July 26, 2005 at 06:54:45:
In Reply to: Re: 4 x 1 Ohm = 16 Ohms (sometimes) posted by manualblock on July 25, 2005 at 18:01:26:
Not dumb, we know that impedance of the speaker is not a constant resistor, but it changes with frequency. Properties of the OPT (Lp - bass frequencies, Lw & Cw high frequencies, etc.), and tube(s) connected (rp) also impact the frequency response.
But, simplified - we can observe speaker like resistor, and primary load Ra like constant resistance, 3,5kOhms in this example, on some "middle" frequencies of interest.
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