Sound insulative masonry block

An acoustic construction block comprising:

• pairs of opposed side masonry walls and opposed end web walls of masonry forming a cavity therebetween;
• an intermediate web wall of masonry disposed parallel to said end web walls and located closer to one end web than the other to divide said cavity into-side-by-side cavity portions of unequal volume;
• each cavity portion being bounded at front and rear sides by one of said side walls, with the dimension of each cavity portion from one side wall to the other being substantially equal;
• one of said side walls containing apertures extending completely therethrough and opening into said cavity portions so as to transmit sound waves into said cavity portions;
• each end wall including an upright channel in its inner surface and said web wall comprising upright channels on both sides thereof;
• said channels being situated approximately midway between said side walls;
• and
• a first panel of sound insulative material disposed within a larger of said cavity portions, the ends of said first panel being uprightly arranged in said channel of one end wall and one channel of said web wall;
• each panel disposed parallel to said side walls and spaced from both of said side walls to form damping chambers on opposite sides of each panel;
• said panels being operable to absorb sound waves and conduct sound waves from one damping chamber to the other.