Massive Passive Valve Equaliser


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The Massive Passive achieved legendary status almost immediately after launch. It has gained a huge reputation for its smooth equalisation, warm sound and incredible “mojo”. It’s a passive equaliser with make-up gain from a valve output stage and is designed to give smooth, characterful equalisation with a little valve warmth

“It just makes things sound better”

“Go subtle or go extreme – it sounds like your source and not an EQ unit”

“Creamy top end, well balanced mids, punchy low end, and tubes to die for”

“The Manley Massive Passive is one of the most wanted Master EQ’s in the world. And for a good reason. This unit will take a dull mix to the next level and make it sound like it should within minutes”

“I’ve had my Massive Passive for a long time now, and it will never leave me. Very special EQ for mastering, mixing and tracking”

“Nothing does what the Mas Pas does. It kinda reacts like one would expect from a parametric equaliser – that is until you start twisting the bandwith knobs! The low end is tight… you really have the option of clearing out the mess in the two lowest octaves. The mids are extremely smooth and very well defined and the high end is to die for. Many eq’s, also expensive units, will sound harsh when boosting more than a couple of dB’s. The Mas Pas, on the other hand, is extremely difficult to make sound harsh or in any way bad”

“The Manley Massive Passive is an incredible sounding EQ. The color that the tubes and circuits add to a mix are unparalleled, and can give a nice warmth to your sound”

“It is one of the most versatile eq´s out there with shelf and bell option on all channels in addition to separate high and lowpass. The highs have something of a sparkle to it..almost like an exiter. Not for everything but can do wonders on some materials.. The mids are amazing and like nothing I have ever heard.. Very “musical” in lack of a better word.The bass can do wonders with shelf/bell combinations at the two low bands but pretty colored and ‘loose’.”


  • Ins & Outs Balanced XLR & 1/4″ (accepts unbalanced)
  • Level +4 dBu nominal, internal switches for -10 operation
  • Bypass Switch bypasses EQ & tube circuits (not hardwire)
  • 44 Frequencies (roughly 1/4 octave spacing)
  • Frequency Range: 22 Hz to 27 kHz
  • EQ Boost/Cut Range : 20 dB boost, 20 dB cut
  • Nominal Q range: 1.5 to 3 (uniquely active in shelf modes)
  • Frequency Response: ±2 dB: 8 Hz to 60 KHz
  • Maximum Output @ 1.5% THD +37 dBv; +26dBv @ 20 Hz
  • THD & Noise (1KHz @ +4 dBu): 0.06%
  • Noise Floor (referred to +4dBu): -85 dB (A Weight)
  • Dynamic Range: 120 dB
  • Tube Complement: 2 x 12AX7 EH, 4 x 6414 for serial MSMPX### after 2/2004
    Tube Complement: 2 x 5751, 4 x 6414 for serial MSMP### until 2/2004
  • Power Consumption (120/240VAC): 72 watts
    100V, 120V or 220-240VAC operation (factory set)
    Operating Mains Voltage changeable with power transformer changeover switch and fuse value change
  • Mains Voltage Frequency: 50~ 60Hz
  • Size (3U): 19″ x 5.25″ x 10″
  • Weight: Unit 21 lbs. Shipping Weight: 27 lbs.

Balanced inputs & outputs are balanced on XLR and jack connectors. Nominal operating level is +4 dBu, switchable internally for -10 operation. Power input (100 / 120 / 220-240 Volt factory set) is on a standard IEC connector.This unit is set for 220-240 Volts. UK IEC or European Schuko lead supplied on request

Standard, but deep & heavy (10 Kg, 250 mm), 3U device suitable for 19" racks. 220-240 Volt AC with standard IEC mains socket. UK IEC or European Schuko lead supplied on request2

Product Page

Massive Passive Product Manual

Attack Magazine Review: The best EQs for Dance Music

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Dancetech Review

Audio Technology Review

Tone Audio Review

Hookup JP Review (in Japanese)

Youtube Demo


In excellent condition with very minor rack rash and a couple of minor marks on the case and front panel. This has come direct from the effects rack of a well-known UK producer and is in 100% working condition

All vintage gear will have case scratches and marks. It may also have, or develop, noisy pots and switches. I make my descriptions as accurate as possible and note any existing defects. I test each item before shipping, and and supply a test sheet, but please understand that vintage gear will not be perfect and adjust your expectations accordingly