Colossal, timbre-twisting passive equalization using metal-film resistors, film capacitors, and hand-wound inductors to organically sculpt the tone from subtle to vivid. Manley’s tube stages handle huge HF boosts without sibilance and unbelievable fatness without mud. “It’s like a Pultec on steroids.”

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. You'll need to experience this.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. Manley knows that recording and mastering equalizers are used by artists for artistic goals and we balanced this design with a little more art than science. 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. This is unique. Being different also gives it some quirks and idiosyncrasies that will spark your creativity and sense of audio adventure. We could attempt to use dozens of superlatives to describe the sounds, but really, you have to experience it yourself. Words cannot do it justice. The astute reader will notice a lack of "buzz words" and that the Massive Passive is not built around gimmicks, plagiarisms, or conventional techniques. However, it is built to complement our Variable Mu® Limiter Compressor for instance... This combo could just be the ultimate processing chain. It's already a Mastering fave. To this end we finally have a new dedicated Mastering Version Massive Passive Stereo EQ available too.

Update: As of January 2020, the Massive Passive now incorporates DRIVEN BY MANLEY POWER®
The MANLEY POWER® power supply is an innovative design developed specifically for Manley Labs, specifically for High Voltage vacuum tubes, and specifically for audio by the world expert team in this technology led by Bruno Putzeys. Proven reliable and sonically superior in the Manley CORE, this power supply provides 300 Volt DC rails to run the vacuum tubes, beefy 6 Volt lines to power them up, along with several other voltage rails for the phantom power and various solid-state control voltages. High Voltage = High Headroom, folks. You will not get near this sonic performance with in any 500-series design. Trust us. This is Massive audio excellence which starts with this superior power supply. All lines are importantly regulated, low impedance, efficient, and super-quiet in this low radiating high frequency design. The universal mains input accepts any voltage or frequency from anywhere in the world making travel with the Massive Passive a breeze.
Please note: This updated Massive Passive with MANLEY POWER is distinguishable from the previous version by its red backlit power button on the front panel, as opposed to the black-knob rotary switch used in prior versions.

The Devil is in the Details 
HIGH PASS FILTERS 22, 39, 68, 120, 220 Hz, OFF
LOW PASS FILTERS18 kHz,12 kHz,9 kHz,7K5,6 kHz, OFF
There are 5 High Pass Passive Filters and bypass, plus 5 Low Pass Passive Filters with bypass. We made them extra steep. Why? So you can remove the garbage and not mess up your music. The way these filters interface with the parametric EQ bands simply sound beautiful. The highest Low Pass filters get even steeper. Attack drums, guitar stacks, and other tough jobs. Make "telephone" voice sounds for special effects.
 
PARAMETRIC FREQUENCIES
LOW22, 33, 47, 68, 100, 150, 220, 330, 470, 680, 1K
LOW MID82, 120, 180, 270, 390, 560, 820, 1K2, 1K8, 2K7, 3K9
HIGH MID220, 330, 470, 680, 1K, 1K5, 2K2, 3K3, 4K7, 6K8, 10K
HIGH560, 820, 1K2, 1K8, 2K7, 3K9, 5K6, 8K2, 12K, 16K, 27K
Each band can be bypassed or set to boost or cut. This provides twice the control resolution over conventional EQs. It also eliminates the problem of a center detent not guaranteeing flat response.
Each band is capable of 20 dB of boost or cut combined with amazing headroom and freedom from clipping.
Steep LP and HP filters for maximum effectiveness and achieved passively for minimal coloration. Low Pass Filters get progressively steeper as the frequency point rises. All of the High Pass Filters, and the Low Pass 6K, 7K5, and 9KHz Filter slopes are 18 dB/octave, the Low Pass 12kHz filter has a 24dB/octave slope and the 18kHz filter has a 60 dB per octave slope.Transformer balanced floating outputs for ease of installation and a touch of desirable flavor. These too were custom designed for the Massive Passive to accommodate the huge boosts possible.

The Features 
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 haveHardwireBypass.

The Specs
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.
 
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