Patent ID: 8011469

Claim:
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 sealably closing off a portion of said transmission line thereby dividing said transmission line into two portions that are airflow isolated from each other, said membrane operable to communicate sound between said portions; a receptacle arranged at said second end of said transmission line; a sound characterization device replaceably installed into said receptacle, said sound characterization device having an intended frequency dependent sound attenuation characteristic and an overall sound dampening level; wherein said sound characterization device is tunable by replacing said sound characterization device with another sound characterization device having at least a differing one of said frequency dependent sound attenuation characteristic and desired overall sound dampening level.