How to Hide Wiring: Speaker and Low-Voltage Wire (DIY) | Family Handyman
Amazon.com: 100 ft Speaker Wire 12 Gauge
Amazon.com: 50ft 18 Gauge Speaker Wire - Waterproof Marine Grade Cable in Spool for Connecting Audio Stereo to Amplifier, Surround Sound System, TV Home Theater and Car Stereo - PLMRSW50 : Electronics
Rocketfish - Bulk speaker cable - 16 AWG - 30 ft - red : Electronics