2025 GMC Sierra Denali The cabin looks completely orignal, hiding the amazing sound system we installed. Fourteen channels of amplificaion ensure the Denali stereo sounds amazing. The ARC Audio amplifiers are hidden behind the rear seats. A JL Audio Stealthbox handles low-frequency duties in the Denali. The passenger door is home to a new Audiofrog GB60 speaker. The left rear door with Audiofrog GS speakers installed. The left front door with Audiofrog woofers installed. A close-up of the GB60 in the passenger door. Audiofrog GB25 mids installed in the dash. An Audiofrog GS25 2.5-inch speaker serves as the center channel.
