Twisted Speaker wires?

Definitely not a bad idea -Bell Labs patented that one back in the 1870s for lowering inductance & [slightly] reducing RFI. Capacitance will rise slightly relative to the same leads in a closely spaced parallel feeder configuration, but not by much. You're only likely to run into potential issues with that when you start using large numbers of individually insulated wires with very extensive twisting [or braiding, but that last is daft], so a non-issue with a normal pair. You're not likely to see many gains with speaker leads, but it may have a slight edge & it won't do any harm.
 
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Length of speaker wires plays a SIGNIFICANT role in terms of L , C and R.
'Exotic' speaker wires of significant length can lead to very subtle audible changes depending on the speakers impedance response and
the Damping Factor of the amplifier.
As mentioned, amplifier stability can become an issue.
 
Quite, although in most conditions stability issues and excessive capacitance aren't too likely with a simple twisted pair of ordinary-gauge wires -the difference to a parallel feeder pair is rarely huge. Some daft multi-braid or over-complex twist with multiple independently insulated wires being used for who-knows-what reason, then sure: it's begging for trouble.
 
Some data: see the Sound King V1 [standard 10ga off-the-reel parallel feeder] and V2 [leads unzipped & twisted at an unspecified rate, but from the gauge & photograph, appears to be roughly 4 turns per foot. Slightly ironically, inductance has actually increased & capacitance fallen for the twisted pair (!) suggesting an insufficient twist rate or some other construction issue. Either way though, it's a good illustration of the relatively minimal effects either way with a simple pair of wires in this sort of gauge, be it closely-spaced parallel-feeder or twisted at a modest rate.

https://www.audioholics.com/gadget-reviews/diy-speaker-cable-faceoff
 
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