I have been running my system in different incarnations for 20 years and the one constant was my 22 foot long pair of speaker cables. Both the speaker manufacturer and amp manufacturer told me there was "no problem" with the lengths of wire.
The idea that speaker cables have to be a certain minimum length strikes me as an audiophile myth too - it likely arises because people who do not understand physics have confused cables with extremely high freq. waveguides used in microwave, radar, etc.
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