You can by this direct or from Parts Express. I paint this on speaker baskets as well as cabinet internals. Also use on tweeter face plates and then paint over with a clear poly.The rough surface reduces fz stick. Used this product on my SC4's years ago.Did one and the stage went to the wall..Had to do the other so I wouldn't have to sit so far off axis..Tom
http://www.cascadeaudio.com/car_noise_control/pdf/VB1X_101612.pdf
http://www.cascadeaudio.com/car_noise_control/pdf/VB1X_101612.pdf