"Eeyore" wrote in message
...


For all the usual reasons like DCR, L and C. Togther with the amp's output
impedance and the loudspeaker, these form a complex filter. I'd not be
surprised to see +/- 1dB variations.


Based on looking up some likely constants for speaker wire I calculate that
the effect of these parameters for 10m of 2.5sqmm figure-of-eight speaker
cable is to produce an upper -3dB point at something like 1MHz. This puts
the -1dB point well above the audio band. "Exotic" cables might, of course,
have a higher capacitance and thus a lower -3dB point, making them
marginally (but probably imperceptibly) worse.

A greater change in frequency response is probably caused by the variation
in speaker impedance with frequency causing changes in the current, and thus
volt-drop in the resistance of the cable. Using the same hypothetical 10m of
2.5sqmm cable this would result in an additional 0.3dB frequency dependant
loss at a frequency where the impedance of a nominal 8 ohm speaker dropped
to 4 ohm. Again not what I'd call particularly significant.


Their preferred cable was IIRC UK T&E 4mm2 mains wiring cable. Back then
heavier 'grades' were very rare.

What use is the earth conductor when the cable is used this way? 4sqmm mains
cable is very stiff and a thorough pain to connect up.

Yup, the more copper, the better.

To a point. It's a law of diminishing returns.

David.