"Adding a subwoofer should not shake the walls. It should not vibrate your furniture. It should simply add depth and intensity to the music. When there are sections with deep bass, the bass should create shockwaves that you feel but don't hear. The sounds you hear of things rattling in your house is not from the bass. It is from the resonances (distortions) that cheap subwoofer amplifiers put out." Is this all true? I figured as the sub approaches the resonating fq of a certain object it should make it rattle.