2020 Jeep Gladiator These Amp Research step bars extend downward as a door opens, and retracts one second after the last door closes. This soundbar upgrade includes a 6.5-inch woofer and a 1-inch tweeter, all in an assembly that bolts directly to the roof pods. The new Alpine radio is weather-resistant with oversized buttons for ease of use. Our technicians securely mounted the new Alpine component speakers in the front portion of the dash.