Hooking up cables – Legacy Audio Whisper XDS User Manual

Page 7

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7

The ideal conductor would have negligible resistance, inductance
and capacitance. The table below shows how a few actual speaker
cables measure up.

Cable

Ωs/ft

pF/ft

µH/ft

12 ga.

0.0033

24

0.21

14 ga.

0.0048

17

0.13

16 ga.

0.0079

16

0.18

18 ga.

0.0128

28

0.21


Capacitance is considered insignificant in each cable because its ef-
fect is well out of the audio bandwidth; inductance can be de-
creased (at the expense of increased capacitance) by keeping the
conductor pair closely spaced.

How long would a cable have to be before inductance effects would
impinge on the audio spectrum? Approximately 300 feet of 12 gauge
would be required to establish a corner frequency of 20 kHz with an
8 Ohm loudspeaker. As you see, inductance is not a problem for
most of us.

Hooking Up Cables

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