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Product code: JA-12-2
If your run exceeds 200 feet, consider using a 12 gauge cable like this 2-conductor cable that is CL3 rated and specifically designed for the outdoors. If you plan to bury the cable, OSD recommends you bury it 4-6” underground so that it's not visible nor pose a danger of somebody tripping over it. Always use CL3 rated outdoor speaker wire which is designed for the outdoors and can can withstand extreme weather conditions like rain, snow and high temperatures and incorporate twice the insulation. These cables also use formulated white polyethylene jacket that is U/V resistant so it will stand up to the sun.
A reasonably priced alternative to Monster® Cable. This wire is perfect for outdoor speakers, low voltage lighting and many other outdoor or direct burial applications. The cable features a specially formulated white polyethylene jacket that is U/V resistant and provides protection against water damage. The audiophile grade wire contains 168 strands of 99.9% pure copper conductors. The high strand count provides improved skin effect.
The 12 gauge will most likely work for your application but we are limited to two colors Black or White Jacket. It also looks like you will be dealing with Fresh Water versus Saltwater. I would check with a marine wire supply for more choices for colors. And talk to an expert in marine wire, seems to meet they have different specs in that industry.
All of our CL3 rated speaker wire has a UV treatment added to the outer jacket so it should not be a problem. Usually, we recommend 12 gauge for Subwoofers and 14 gauge for an upgrade from 16 gauge. The 16 gauge works best when terminating into our Speaker Selectors and indoor Volume Controls. Make sure your speakers will accept up to 12 Gauge. The rule of thumb for us is 16 gauge for runs up to 80 feet and 14 gauge for 81 to 200 feet. And 12 above that. Also 14 gauge for subs up to 50 feet and 12 AWG above that. It is never a bad thing running bigger wire.