Manley Labs Massive Passive Stereo Tube EQ

Manley Labs Massive Passive Stereo Tube EQ

Manley Labs Massive Passive Stereo Tube EQ

B&H # MAMSMP MFR # MSMP
Important Notice: This item is non-cancelable and non-returnable
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Expected availability: 7-14 business days 
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Product Highlights

  • Passive Inductor-Based EQ
  • 4 Bands of Parametric EQ per Channel
  • Switchable Shelf EQ with Bandwidth Shape
  • Hand-Selected Vacuum Tubes
  • Hand-Wound Output Transformers
  • Parallel Symmetrical Topology
  • Auto Warm-Up Delay: 20 Seconds
  • Bright Blue LEDs for Active Functions
  • 3U Rackmount
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  • 1Description
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.

Each of the 4 bands offer Pultec-style controls, each with fixed frequency selections, variable bandwidth, and either 20 dB of boost or cut. This design allows for twice the control resolution over conventional EQs and eliminates the problem of a center detent not guaranteeing a flat response. The parallel topology allows for massive tone shaping without over driving the outputs. For instance, if you were to boost 4 bands at 1 kHz by 20 dB, the output would still only be +20 dB, whereas a conventional "series" EQ would output upwards of +80 dB.

Additional features include individual band bypass and the ability to switch each band from bell curve to shelf. The two left-most bands offer low shelf capabilities, while the right two offer high shelf. The bandwidth knob changes the properties for each of the shelves as well. The unusual "Constant Bandwidth" controls offer unique tone shaping capabilities. In bell mode, they behave like most "Q" controls of a parametric EQ with a wider shape when set fully counterclockwise, and narrower when set fully clockwise.

The shelf modes offer a special function. When the knob is set fully counterclockwise, the curves are similar to most shelf EQs. As you increase the bandwidth clockwise, a gradual bell-shaped dip is introduced as the slope increases, which modifies the overall shelf shape. It's rare to find an analog EQ with adjustable high shelf curves.

The high and low pass filters are individual circuits selected by switch settings, and each has specific slopes catering to their respective frequency range. All the filters are entirely passive and "inserted" between the boost and cut sections. The two "EQ In" push buttons engage the EQ on their respective channels. When bypassed, the EQ section and tubes are bypassed, but audio signals are still passed through the line amplifier and balanced output transformer. The -6 to +4 dB gain trims are intended to help level match between the "Bypass" and "EQ In."

There are no dedicated meters on the Massive Passive, instead bright blue LEDs indicate "EQ In," while red and green LEDs indicate cut and boost engagement respectively. Hand-made in the USA, the unit is housed in a 3U steel chassis with a CNC-machined 1/4" faceplate that is also inlaid with laser-engraved inserts. The Massive Passive ships with an IEC power cable.

Overview
  • 44 selectable frequency bands
  • 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 with unique slopes
  • Gain trim for level match between "Bypass" and "EQ In" modes
  • Auto-mute warm-up delay offers 20 second buffer before passing signal
Center Section for Each Channel
  • EQ In: Bypass for EQ, filter and tube section. Line amp and output transformer are still active in bypass
  • Gain Trim (-6 to +4 dB): For level matching between "EQ In" and "Bypass" modes
  • Low Pass Filter (6-Way Switch): Selects off or 1 of 5 available filters
  • High Pass Filter (6-Way Switch): Selects off or 1 of 5 available filters
4-Band EQ Per Channel with Each Band Featuring
  • 2-Way Toggle Switch (Bell/Shelf): Switches EQ mode
  • 3-Way Toggle Switch (Boost/Out/Cut): Switches boost or cut mode. Out is the band bypass
  • Gain Knob (0 to 20 dB): Sets cut or boost depth
  • Bandwidth Knob: Adjusts the width of the bell curve or shelf shape
  • Frequency Switch (11-Position): Selects a fixed frequency
UPC: 890833000038
In the Box
Manley Labs Massive Passive Stereo Tube EQ
  • IEC Power Cable
  • Limited 90-Day Warranty, Extends to 5 Years with Registration
  • Table of Contents
    • 1Description
    Input & Output Inputs
    2 x XLR transformer balanced and floating
    2 x 1/4" TRS balanced and unbalanced
    Outputs
    2 x XLR transformer balanced and floating
    2 x 1/4" TRS balanced and unbalanced
    Level Range Level: +4 dBu nominal
    Internal Switch: -10 dBu
    Filter Type (Slope) Filters
    High Pass: Off, 22, 39, 68, 120, 220 Hz
    Low Pass: 6, 7.5, 9, 12, 18 kHz, OFF
    Filter Slope
    High Pass Filter Slope (All Frequencies): 18 dB/Octave
    Low Pass Filter Slope (6, 7.5, 9 kHz): 18 dB/Octave
    Low Pass Filter Slope (12 kHz): 24 dB/Octave
    Low Pass Filter Slope (18 kHz): 60 dB/Octave
    EQ Section Frequencies: 44 (roughly 1/4 octave spacing)
    Frequency Range: 22 Hz to 27 kHz
    EQ Boost/Cut Range: 20 dB
    Nominal Q Range: 1.5 to 3 (uniquely active in shelf modes)
    Equalizer Control Bands Parametric Frequencies
    LOW: 22, 33, 47, 68, 100, 150, 220, 330, 470, 680, 1000 Hz
    LM: 82, 120, 180, 270, 390, 560, 820, 1200, 1800, 2700, 3900 Hz
    HM: 220, 330, 470, 680, 1000, 1500, 2200, 3300, 4700, 6800, 10,000 Hz
    HI: 560, 820, 1200, 1800, 2700, 3900, 5600, 8200, 12,000, 16,000, 27,000 Hz
    Frequency Response Frequency Response: 8 Hz to 60 kHz ±2 dB
    Maximum Output Maximum Output: @ 1.5% THD +37 dBv; +26 dBv @ 20 Hz
    THD & Noise THD & Noise (1 kHz @ +4 dBu): 0.06%
    Noise Floor Noise Floor (referred to +4 dBu): -85 dB
    Dynamic Range 120 dB
    Bypass Bypass Switch: Bypasses EQ and tube circuits (not hardwire)
    Tube Type 2 x 12AX7 EH
    4 x 6414
    Power Supply 72 W @ 120 VAC, 60 Hz
    Rackmountable 3 U
    Dimensions (W x H x D) 19.0 x 5.3 x 10.0" / 48.3 x 13.3 x 25.4 cm
    Weight 21.0 lb / 9.5 kg
    Packaging Info
    Package Weight 27.55 lb
    Box Dimensions (LxWxH) 22.9 x 18.3 x 10.1"

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