The logical extension of the baffle and open back cabinet is to enclose the rear of the drive unit completely, creating an infinite baffle.
It would now seem that the rear radiation is completely controlled. However, there are problems:
At this point it is worth saying that the bare drive unit is often used in theater sound systems where there is a need for extreme clarity in the human vocal range. Low frequencies can be bolstered with conventional cabinet loudspeakers.
Despite these problems, careful design of the drive unit to balance the springiness of the trapped air inside the cabinet against the springiness of the suspension can work wonders.
The infinite baffle, properly designed, is widely regarded as the most natural sounding type of loudspeaker (electrostatics excepted).
The only real problem is that the compromises that have to be made to make this design work result in poor low frequency response.
Points of order:
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