Hertz SPL Monster MM 12 Passive Car Subwoofer Monster MM 12 by Hertz.

This speaker has a nominal power (RMS) of 2000 Watts and a diameter of 12 inches.

The speaker does not have an enclosure, which helps save space in the cabin or trunk of the car.

Passive subwoofers like this one do not have a built-in amplifier, so an external amplifier is required for them to operate, which also determines the quality of sound reproduction.

In passive speakers, the phenomenon of overheating of the speaker and air during operation is not encountered due to the absence of an internal amplifier.