Speed of Sound Audio Experts delivers a high-performance Harley Road Glide audio upgrade built for clear, powerful sound at highway speeds. This install features Ground Zero 6×9 lid speakers, ARC Audio Moto 720 amplifier, fairing and saddlebag speaker upgrades, plus Apple CarPlay unlock with Harley GTS radio tuning and EQ flash. Trusted motorcycle audio experts in Somersworth, NH, specializing in custom Road Glide sound system upgrades.