Audio Function - Sound Equalizer Automatic Switching Function

Sound quality in a fully - open retractable hard top condition is improved by the correction for bringing the frequency characteristics in a fully - open retractable hard top condition closer to the characteristics in a fully - closed retractable hard top condition. When the retractable hard top is in a fully - open condition, sound pressure is reduced due to the absence of sound echo generated by sound reflection from the retractable hard top. BOSE amp. detects an open - close condition of the retractable hard top by receiving a roof status signal from the retractable hard top control unit and switches the equalizer to correct the frequency characteristics in a fully - open retractable hard top condition. During the switching of the equalizer, audio stops temporarily due to the temporary mute.