I get a kick out of the cable types and gauges we use, especially when I read charts in vintage manuals:
McIntosh's Chart for AWG/distances, (lampcord suggested).
pg 5 or 6 here
McIntosh-MC2205-Owners-Manual.pdf
formula: do not exceed 5% resistance of speaker's impedance
examples:
16 awg: 4 ohm: max: 25'; 8 ohm: max 50'
12 awg: 4 ohm: max 60'; 8 ohm: max 120'.
.......................................................................
calculator:
https://www.wirebarn.com/Combined-Wire-Gauge-Calculator_ep_42.html
My single run of Cat 8: 8 strands of 22 awg is equal to 13 awg
so I'm using 13 awg for 12' run, 16 0hm speakers.
McIntosh chart says 13 awg is good for 100' 8 ohm; 200' for my 16 ohm speakers!