> The laptop's specs from the manufacturer do not list the output
> impedance anywhere and the manufacturer's web site was of no use for
> this either.  Googled for the same information but I did not find
> anything reliable as far as this info is concerned.
impedance matching is a good idea with high frequency transmission lines but
for audio over the kind of cable lengths you'd find in normal applications
(excluding very long distance telephone lines and similar) its a pointless
waste of power.

for audio work (especially signal level stuff but also with some power
amplifier design) you typically have a low output impedance driving a high
imput impedance and don't give a damn about the characteristic impedance of
the cable.

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