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#85919 12/26/2004 4:43 AM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | DC transformer resistance and speaker resistance really have little to do with ac impedance (which is usually measured at 1 kHz for speakers).
Impedance is the algebraic sum of the DC resistance and the AC reactance, which is 2*pi*frequency*X*i, where X is the inductance of the coil. I is the square root of -1, which means the inductance is 90 degrees out of phase from the resistance.
It is desirable from a fidelity and electrical power loss standpoint to have as low a DC resistance of the coil/output of amp as possible. The AC impedance is all that applies in this situation.
For optimum power transfer the output impedance of the amp should match the impedance of the speakers. I won't go into the math, as it is boring and hard to follow in text.
Most old stuff was 16 to 8 ohms. If you are experiencing low output you may have faulty output tube(s) or some other problem. Power tubes lose gain as they wear out resulting in low volume and/or distortion.
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