Documents & Information
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Further detailed information can be found here: Technical Data Sheet High-pass Protection Unit.

Accessories
High-pass filter for invisible loudspeakers with 40 watts / 4 ohms or 80 watts / 8 ohms for safe operation with conventional amplifiers. Robust housing made of ABS plastic with mounting holes.
The Highpass Protection Unit prevents impermissible mechanical excursion of the driver, thereby counteracting increased distortion with the risk of electrical overload and cracking. This significantly reduces thermal and mechanical stress on the Invisibles.
Invisible High-Pass Protection Unit
Further detailed information can be found here: Technical Data Sheet High-pass Protection Unit.