Dear all I have charade when my car goes in any gadda on sarak my trunk gives sound like tuk dhuk I check the speaker peti its fix properly i found one culprit which is seat lock and has some space when car goes into any breaker or road gadda it moves and create sound of duk duk other sounds I can not identify I have properly fix the jack also and put one rubber Matt under tyre so. But couldn't found the sound . I guess is it from diggi joint ? Please suggest how to check sound and eliminate them