"You are <I>not</I> going to believe this."

"You are <I>not</I> going to believe this."

"You are <I>not</I> going to believe this."

"You are <I>not</I> going to believe this."

"You are <I>not</I> going to believe this."

"You are <I>not</I> going to believe this."

"You are <I>not</I> going to believe this."

"You are <I>not</I> going to believe this."

"You are <I>not</I> going to believe this."

One of the great imponderables in hi-fi is how much the vibrations of a dynamic loudspeaker's cabinet walls contribute to its overall sound quality. Studies by William Stevens in the mid-1970s showed that, with some speakers, the acoustic output of the enclosure could be almost as much as that from the drive-units. Since then, responsible speaker designers have worked hard either to damp cabinet vibrations or to shift them to higher frequencies where their effect on the music will be less deleterious.