My neighborhood is full of young guys with loud, booming stereo systems in their vehicles. I want to blockout/ cover the windows in my studio completely & permanently. Rockwool seems to get good reviews but I don't think it excels at very low frequencies. Google suggests "Mass Density Vinyl" for blocking bass but I dont know how thick I need, the pricing or where to get it.
I have one huge 4' x 8' window and one normal size window. Im fine spending up to $600 if it means significant sound reduction of those annoying bass frequencies.
I welcome all suggestions, even out of the box ones. Btw, Looks are not important to me at all cause I'm just gonna cover it with Blackout curtains, never to be opened again. Please help me before I go postal on every low rider in my neighborhood ๐