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Passive

An electronic device that does not use any amplification circuits. Applied mostly to filters, it describes a cut-only design, and because of this, passive circuits are less prone to distortion. In practice, even though a filter is described as passive, it may none the less have make-up gain circuitry at its output to compensate for the loss in power that cutting can cause.

Passive Radiator

An element in speaker design that is used to improve the bass response of smaller cabinets. Consisting of a diaphragm that resembles a woofer, but without the voice coil, it is meant to move sympathetically with the energy delivered by the active woofer. While providing a greater bass response, the diaphragm is hard to control and can lead to overtly boomy bass response.

a low budget alternative to Massive Passive EQ

Hello. I have a small project studio and usually i don't have any mastering on my projects mix - i know very pro gear are needed for that. The only operation i like doing is to insert a SPL Vitalizer in the main out channel of my Mackie 32-8 mixer, so that the mix sound is like... sweatened and rounded.