Manley Massive Passive Mastering

The Mastering Version, Heir to the Reference Massive Passive

The Massive Passive redefined the color and transparency of tube passive equalizers. The "Mastering" version retains this musical character while adding what studios seek: reliable recall, perfectly matched channels, and redesigned filters to work on the full program with pinpoint accuracy.

Designed for Mastering, Formidable on the Mix Bus

Ideal for mastering engineers and stereo bus processing, it excels in broad and coherent adjustments, tonal balance corrections, and transient shaping without a "processed sound." The mechanical detents allow settings to be recorded and reproduced, ensuring consistency across versions, recalls, and revisions.

Features and Innovations Serving the Sound

Uncompromising recall: The detented GAIN and BANDWIDTH controls (16 positions) allow repeatability while preserving the intentional interaction between gain and bandwidth. The maximum amplitude is calibrated for mastering: +/-11 dB, with values varying according to bandwidth (widest bell ~= 6 dB, narrowest Baxandall ~= 12 dB). The frequency selector is detented (Grayhill).

Tube passive architecture: passive processing, tube line drivers, and parallel topology for curves that blend musically. Bands can overlap without artificially summing, avoiding clipping while remaining natural.

Dedicated Mastering filters: high-pass and low-pass filters retuned, flatter before the action zone, for surgical cleaning of the low end and ultra-high frequencies. Slopes are very steep to clear space without affecting the music.

Technical specifications

Number of channels

2

U-height

3

Inputs and outputs	balanced XLR and 6.35 mm stereo jacks, accept unbalanced connections.	Low-pass filters	OFF, 52 k, 40 k, 27 k, 20 k, 15 kHz.
Nominal level	+4 dBu, internal microswitches provided for operation at -10.	Typical slopes on the Mastering version	18 dB/oct (52 kHz to 30 dB/oct) ; very steep slopes possible up to 36 dB/oct depending on use.
Bypass function	bypasses the equalizer and tube circuits.	Frequency response	+/-2 dB from 8 Hz to 60 kHz.
Equalizer architecture	fully passive, symmetrical parallel topologies.	Maximum output level at 1.5% THD	+37 dBv ; +26 dBv at 20 Hz.
Number of frequencies	44, spaced approximately one quarter-octave apart.	THD + noise (1 kHz at +4 dBu)	0.06%.
Operating frequency range	22 Hz to 27 kHz.	Noise floor (reference +4 dBu)	-85 dB (A-weighted).
Cut/boost range	maximum +/-11 dB.	Dynamic range	120 dB.
Nominal bandwidth (Q)	1.5 to 3 (active in Baxendall modes).	Tubes	2 x 12AU7, 4 x 6414.
Band configuration	bell or Baxendall for each band, with possible frequency overlap.	Power consumption (120/240 VAC)	72 W.
GAIN and BANDWIDTH controls	detented, 16 positions, step size varies according to bandwidth.	Factory-set mains voltage	100 V, 120 V or 220-240 VAC depending on destination country.
Indicative amplitudes according to bandwidth	widest bell ~\= 6 dB ; narrowest Baxendall ~\= 12 dB.	Mains voltage modification	via the power transformer selector, with fuse replacement.
FREQUENCY selector	detented Grayhill contacts.	Mains frequency	50-60 Hz.
High-pass filters	OFF, 12, 16, 23, 30, 39 Hz.	Fine gain adjustment	11-position Grayhill selectors, 0.5 dB steps, range from -2.5 to +2.5 dB.