Dynamat Dynabox 50306 6" Ceiling Speaker Enclosure Kit

Last winter I had in ceiling speakers installed. I was not told at the time that back boxes were even a thing, so I had the speakers just installed with no sound installation. I never realized how much sound was coming through the floors upstairs until I was standing over the speakers one day and could literally feel my floor shaking. I had these guys installed and the difference is amazing. I can now sit downstairs and listen to my music or watch a movie and no longer worry that the people upstairs are being shaken out of bed!

Does exactly what it's supposed to do, buy it!

I purchased 5 of the DynaBox for my family room in-ceiling speakers. I have 5.1 surround system with directional in-ceiling speakers and the room sits directly below the upstairs master bedroom. There were two objectives in using these: 1) reduce audio sound in the upstairs bedroom and hallway that was coming through the upstairs floor that sits above the speakers and 2) improve sound quality in the family room itself by providing better backing to the speakers. The boxes definitely helped in both cases, probably more with the insulation of sound to the upstairs than a noticeable improvement of audio in the family room. With regard to the sound insulation, I ran a couple of subjective tests by playing the same movie scene and music at two different volume levels both before and after installing the boxes. I put the Denon receiver at a volume of 45 and then at 65 while playing the opening scene from The Dark Knight and then some rock music. Both my wife and I went upstairs and listened. After installing the boxes I'd say there was about a 30-40 reduction in sound coming through the floor to the upstairs. I can now play movies and music at higher volumes downstairs later at night and not have to worry about waking someone up. There was also a slight improvement in sound quality in the family room. My summary would be that these definitely provide some improvement but are not a silver bullet and will not completely eliminate sound coming through the backs of speakers to adjacent rooms/areas. They are also a bit expensive for what they do. Final thought, installation matters! Try to leave nothing more than minimal gaps and make sure the rubber part is flush with the drywall or whatever it is sitting against, and position that foam piece evenly in the back of the box to cover as much of the box as possible.