the thread below has some discussion on the topic. I've run 3 meters plus the 1 meter on the table without any complaints.
http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1120666746
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http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1120666746
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How long can you go with a phono cable?
I was wondering whether there a length beyond which you would not want to go with a phono cable. I see most cables are 1.0 - 1.5 m. Is it because of the low voltage produced by the cartridge?