Bass has the most energy, therefore power requirement is also highest. Terminate at the bass, then jumper to treble/mid for single cables.
I found copper has a darker quality, silver plated copper sounds good to me, and it's a little cheaper than pure silver.
Silver plated copper doesn't suffer contamination caused by moisture or other chemicals that leach from carpet, so the cable joint maintains for many years without attention, other than regular tightness checks.