I am wondering the same thing except I need 20 foot runs. Do you know what is the gauge of the 12tc wire? I am using 20 foot runs of Groneberg speaker wire but not sure of the gauge.
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I was considering going to a pair of 12TC, but went with a second run to have double 8TC biwiring.
The 12TC is a little heavier than the 8TC. but not much.
The claim is the 12TC has better bass.
With the 12TC internal biwire would allow 4 strand for mid highs and 8 strands for bass.
(or 5 and 7)
I already owned the old blue/black 8TC, so i added the white/clear for mid highs and used the blue black for bass.