The Massive Passive from Manley Labs offers two channels of 4-band parametric equalization with additional 5-band high pass and low pass filters. Its design draws from vintage EQs using passive, parallel topology to create a natural and organic tone. Simple circuits with premium-quality components, like metal film resistors, film capacitors, and hand-wound inductors are used for sculpting the sound. The mastering version uses mechanically detented bandwidth, gain, and gain trim knobs to ensure repeatability, but limits the range of operation. The high pass and low pass filter slopes have been tuned specifically for mastering settings.