If the speakers are 8ohm, 14g will be ok out to about 80ft, but you’ll want to run 12g or thicker if pushing speakers that are 4-6ohm; and in that case 10-12g wire is recommended to prevent power loss at 75’.
Speakers: PSA MTM-210T x2, MTM-210C, MT-110SR x2; Atmos-SVS Satellite x2, DIY Volt-10 x2
Subs: PSA V1801 x2, DIY: 18" RSS460HO, 15" RSS390HO x2, BOSS w/JBL CX1200 x6
MA’s: Crowson Tech x2
Processing: Denon X4200, NU6KDSP, 3KDSP
Video: Epson 3700; Screen: Silver Ticket 106" High Contrast