Manley Massive Passive Stereo Tube EQ



Two-channel four-band vacuum tube parametric EQ.

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Brands: Manley Labs
Manley Labs


Manley Massive Passive Stereo Tube EQ

Newer SMPS MANLEY POWER version!

The MASSIVE PASSIVE is a two-channel, four-band equalizer, with additional high-pass and low-pass filters. “Passive” refers to the tone shaping part of this clever new EQ design not using any active circuitry. Only metal film resistors, film capacitors and hand-wound inductors sculpt the sound, kinda like a Pultec EQ on hyper-steroids. Super-beefy, hugely-high-headroom Manley all-tube make-up gain amplifiers deliver your tunes into the next realm. “Massive” – it’s a fitting word for this beast.

Creating natural, organic, acoustic tone can only be done with an equalizer that treats the signal with natural methods. The Massive Passive uses simple passive components and exploits their natural qualities rather than forcing a complex circuit to meet an arbitrary clinical or scientific goal. The Massive Passive is intended both for the most radical EQ sometimes needed for tracking as well as the most subtle shadings for vocals and mastering. It is designed to be a fundamentally different EQ but incorporates the best strengths of Pultecs, choice console EQs, parametrics and graphics. The difference is that the Massive allows twice as much EQ with half the coloration. It allows huge HF boosts without sibilance problems and unbelievable fatness without mud.


  • Inputs: Balanced XLR & 1/4” (accepts unbalanced)

  • Outputs: Balanced XLR (accepts unbalanced) & Unbalanced 1/4”

  • Level +4 dBu nominal

  • Bypass Switch bypasses EQ & tube circuits: 1/4” Jacks (not hardwire)

  • Bypass Switch bypasses EQ, tube circuits & Input Buffer: XLR Jacks (Hardwire Bypass)

  • Gain Trim: -6dB – 0dB – +4dB

  • 44 Frequencies (roughly 1/4 octave spacing)

  • Frequency Range: 22 Hz to 27 kHz

  • EQ Boost/Cut Range : Maximum 20 dB boost or cut

  • Nominal Q range: 1.5 to 3 (uniquely active in shelf modes)

  • Maximum Input Level: +21dBu

  • Maximum Output Level (1kHz sine, 1% THD+N, BW 22Hz-22kHz, Load 100kOhms): +35dBu

  • Frequency Response (@ +4dBu, Load 100kOhms): -0.1 dB @ 10Hz, -1 dB @ 60 kHz

  • Total Harmonic Distortion (THD+N) (1kHz sine @ +4dBu, BW 22Hz-22kHz): 0.006%

  • Output Headroom (Reference to +4dBu): 31dB

  • Dynamic Range (Reference to Maximum Output): 123 dB

  • Noise Floor Typical (Unity Gain): -88 dBu (A-Weighted)

  • Signal to Noise Ratio (Reference to +4 dBu, BW 22Hz-22kHz): 92dB

  • Input Impedance: 20kOhm

  • Output Impedance: 150 Ohm

  • Tube Complement: 2 x 5751, 4 x 6922

  • Auto-mute warmup delay = 20 seconds

  • Power Consumption (120/240VAC): 44 watts

  • Mains Voltage & Frequency (VAC/Hz): Internal Universal Power Supply 90-254 VAC / 50-60Hz

  • Size (3U): L 19” x W 10” x H 5.25”

  • Unit Weight: 15.5 Lbs.

  • Shipping Box: L 23” x W 15” x H 10”

  • Shipping Weight: 26 Lbs.


  • All-Passive tone sculpting circuitry

  • Unique Shelf curves use the “bandwidth” control

  • Overlapping and Interleaved Frequency choices

  • Every band switchable to shelf or bell

  • Vacuum tube make-up gain and line drivers

  • Parallel symmetrical topology

  • Premium components throughout

  • Passive HP and LP Filters plus gain trims

  • Units built after 2016 or 2017 MK2 revision have Hardwire Bypass.