Skiing Ninja can also supply you with higher quality internal wire.
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When I used to upgrade several pairs of speakers my pick was Audioquest Type 6 as it was reasonable in cost, very good, pliable and small enough diameter to push through any board holes for soldering.
Try to avoid using the solder/push-clips as they are awful sonically. CAREFULLY solder directly to connectors. It's easy to melt the connectors at the driver side. Use silver solder avoiding lead core.