Well, here is the deal. If you want to develop a quality stereo system, a sound deadening material is not an option, it is compulsory.
Why is that?
Allow me to ask you a question. Do you want to hear road noise or hear music? Do you want your license plate to be silent, or rattle with the bass hits? Do you want to hear the tires, or do you want to hear music?
The noise cancelling curtains is excellent for minor jobs, but if you want to get maximum effect, you will have to purchase them in bulk quantity. When you purchase it in bulk quantity, you will also require a nozzle of some type. Generally, this can be bought with the huge bucket of sound deadening.
The other type of sound deadening comes in the form of sound proof booth. The deadening is harder to work with, but much more efficient than the spray on type. It is generally used on the bigger areas, or where more deadening is required.
As sound deadening can get costly, the smart installer installs it where it is most efficient. To find this out, take a drive in your car with the radio off and listen to the source of the noises in your vehicle.
Have you ever noticed that specific acoustic ceiling panels in your vehicle vibrate when specific bass frequencies play? Get some spray on the sound deadening materials and apply it to the back of the panel to strikingly lessen the vibrations. For bigger panels, use sound deadening sheets.
Does your license plate rattle with the bass hits? Just fix it! Take a sound deadening material and apply it to the back of the license plate and the license plate frame. It definitely works!