Can I sit in vehicle and hear somebody use "say3D" sound loud and clear?

[God of Monkeys 14]

I put a civilian and use say3D to let the civilian say  my record sound. (It will loop say "help! help! help!")

 

But I find when I in vehicle, whether it is convertible car or not, I can't hear very clear when I in car, the sound volume will very small, I can only hear very little.

But when I get out vehicle, the sound will very loud and clear.

 

Is there any script can modify this situation?