American Wire Gauge (AWG) to mm² conversion chart.
http://gemsaid.com/images/Conversi%C3%B3n-AWG-MM2.jpg
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American Wire Gauge (AWG) to mm² conversion chart.
http://gemsaid.com/images/Conversi%C3%B3n-AWG-MM2.jpg
In order to maintain a decent damping factor, the rule of thumb is that the loop resistance of the speaker cable should be no more than 5% of the nominal impedance of the speaker. Don't worry about the ohmic loss - it will be negligable; as shown by the graph in Martin's post above.
Thank you all for the advice
I've order a 25m reel of 4mm cable now.
Thanks again
Cable arrived yesterday and speakers successfully relocated away from offending furniture.
As the speakers are now in a different location it's impossible to say if the cable has made any improvement, it's twice as thick but also twice as long as the old cable.
Just under £1 per metre Inc delivery