It is better to buy fire retardant type, and the cavity is fully filled with 5-8 bottles.
Methods: Cavity filling.
Steps: The first thing to start is cavity filling! Because cavity filling use the bare frame of various holes to achieve filling, in order to avoid the shock plate covering all kinds of holes, so it is the first step to carry out!
And the role of cavity filling is to cut off the various connecting cavities in the frame, so that air can not be transmitted and reflected through sound in the frame cavity, Filling can be very effective in suppressing all kinds of cavity resonance roaring sound, effectively reduce noise intensity.