Audiophilepure

Shown below is an exploded view of the FR5. The inside of the enclosure is open to both drivers, but there is a 4mm deep cup with damping material that seals the tweeter voice coil along with a foam gasket for the tweeter frame. There are several braces as well as long bolts that attach the front baffle to the rear panel. This pulls the enclosure very tightly together. Polyester fiber is used inside the enclosure for damping.

The box is tuned to 35 Hz. Passive radiator enclosures have a steeper roll-off below their tuning point than a typical ported enclosure because of the additional compliance term of the passive radiator.  As such, there isn’t much output capability below the tuning frequency.

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