The following sound deadening materials are used at several parts.
REAL SCHILD ( Reduce the vibration )
EPT SEALER ( Soundproofing / Sound insulation around speakers )
REAL SCHILD "Absorb" ( Vibration damper and Noise barrier - 80 degrees C heat resistance)
THINSULATE ( Sound insulation - Light weight )
XETORO ( Sound insulation - heat resistant material )