Tunable sound transmission device for a motor vehicle

A tunable sound transmission device for transmitting an engine rumble sound into an interior of a motor vehicle, comprising:

• a transmission line having a first end and a second end, wherein said first end is in acoustic communication with an air intake tract of an engine;
• a flexible membrane having a sound transmitting portion and a mounting portion, said membrane arranged at and having a first side closing off said second end of said transmission line;
• a sound broadcast duct including:
• a mouth at a first end of said broadcast duct, said mouth sized and configured to close against and receive sound from an opposing second side of said membrane, said duct arranged to transmit said engine rumble sound towards said interior of said motor vehicle;
• a receptacle arranged at an opposing second end of said broadcast duct;
• a carrier cage sized and configured for removable installation into said receptacle;
• and
• a sound characterization device replaceably installed into said carrier cage, said sound characterization device having an intended frequency dependent sound attenuation characteristic and an overall sound dampening level;
• wherein said sound characterization device is end user changeable by replacing with another sound characterization device having at least a differing one of said frequency dependent sound attenuation characteristic and desired overall sound dampening level.