Mass loading can affect/improve cabinet resonance issues but is not a one size fits all path as it can affect resonant frequencies and will respond differently for different speakers depending on the many design choices made by the designer.
One loading option I have found to improve focus, bass and stability of my speakers is the use of heavy Sound Anchor stands, which they can make for any speaker. Another consideration for more decor-friendly weights are the brass weights from edenSound. Many believe the resonance of brass is musical, and many like the look of brass. However, Dan at edenSound can also make his brass weights in a black finish, like the four black fat boy weights he recently finished for me.
One loading option I have found to improve focus, bass and stability of my speakers is the use of heavy Sound Anchor stands, which they can make for any speaker. Another consideration for more decor-friendly weights are the brass weights from edenSound. Many believe the resonance of brass is musical, and many like the look of brass. However, Dan at edenSound can also make his brass weights in a black finish, like the four black fat boy weights he recently finished for me.