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Welcome to the Forum, James!
I’m afraid there are no easy answers for you. The problem is, RCA’s, especially the in-line variety, are totally incompatible with 14-ga speaker wire. RCA’s are light-duty connectors made for the tiny wiring in signal cables. For starters, 14-ga won’t even fit in the hole of the barrel of most in-line RCA connectors. If you manage to get past that obstacle, you have another problem, that being the soldering process will probably ruin the connector. By the time you heat up the center pin’s solder cup hot enough for the heavy-gauge wire, it’ll melt or warp the plastic insert the pin sits in.
About your only option is to splice down the 14 to 18 ga. in the outlet box. You should be able to solder that to an RCA.
Regards,
Wayne A. Pflughaupt
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