Manley Labs Stereo Variable Mu Limiter Compressor, Mastering Version with T-Bar Mod

SKU: MLMMSSLCTBAR MFR: MMSSLCHPTBAR
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Key Features

  • Achieve pristine audio mastering with the Manley Stereo Variable Mu Limiter Compressor.
  • Sculpt dynamic sound effortlessly using the variable attack and release time controls.
  • Experience vintage warmth with the all-tube circuitry for rich, harmonic textures.
  • Mastering-grade compression: Glue tracks with the renowned Manley Stereo Compressor.
  • Enjoy versatile signal processing with selectable compression ratios for any source.
  • Precisely control gain reduction using the stepped threshold and output level controls.
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Special Order?Estimated to Ship: 09/29/2025
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Manley Labs Compressor Specifications

  • Number of Channels

    2

  • Inputs

    2x XLR transformer balanced (600Ohms)

  • Outputs

    2 x XLR transformer balanced (600Ohms)

  • Input Level

    Input Level Switch: -4, -2, 0, +2, +4 dB

  • Output Level

    Output Level Switch (24 Detents): -11 to 0 dB (1/2 dB steps)

  • Compression Threshold

    Threshold Switch (24 Detents): -11.5 to +1 dB
    Compressor (1/4 dB Steps): 6 dB range
    Limiter (1/2 dB Steps): 12 dB range

  • Ratio

    Compressor: 1.5:1
    Limiter: 4:1 to 20:1

  • Attack Time

    Variable Attack: 15, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90ms

  • Release Time

    Recovery 5 Steps (5 Detents): 0.2, 0.4, 0.6, 4.0, 8.0 sec

  • Maximum Output Level

    +30 dBu (26 Vrms) 26 dB Headroom

  • Make-up Gain

    +35dB

  • Frequency Response

    20Hz to 25kHz

  • THD & Noise

    <0.1% THD at 1kHz
    Noise Floor: -85 dB typical

  • Meter

    Illuminated Sifam meters

  • Tubes per Side

    Fully Differential All-Tube Circuitry: 5670, 5751 (or 12AX7), 7044 (or 5687) & 12AL5
    (T-Bar mod replaced 5670s with 2 pairs of 6BA6s)

  • High Pass Filter

    HP SC: High-Pass Side-Chain Filter:
    -1 to -3dB at 100Hz
    -4 to -6dB at 50Hz

  • Rackmountable

    2U

  • Power Supply

    120 VAC, 80W, 60Hz

  • Fuse

    Mains Fuse Value: 1.25A
    Mains Fuse Type: MDA or MDL SLO-BLO Time Delay: 1-1/4" x 1/4"

  • Dimensions (W x H x D)

    19.0 x 3.5 x 10.0" / 48.26 x 8.89 x 25.40cm
    Power Transformer protrudes 3.5" / 8.89cm out back of chassis

  • Weight

    14.0lbs / 6.35kg

About Manley Labs Compressor

Find the perfect blend of vintage warmth and modern precision with the Manley Labs Stereo Variable Mu Limiter Compressor, Mastering Version with T-Bar Mod. This high-quality, professional-grade audio equipment is a standout product from Manley Labs, a respected name in the audio industry.

The Stereo Variable Mu Limiter Compressor is renowned for its innovative design and advanced features. It's not just a compressor; it's a tool that has shaped the sound of countless hit records over the past decade and will continue to do so in the future. The term "Mu" in tube technology refers to gain, and this device uses the unique concept of "remote cut-off" or re-biasing of a vacuum tube to achieve smooth, precise compression.

This durable audio equipment is one of the few all-tube compressors that utilize this technique, similar to the coveted vintage Fairchild 670. Even the side-chain in this device features glowing rectifier tubes. At the heart of the peak-reducing and compression action is the unique 5670 dual triode, which is constantly re-biased by the vacuum tube rectified side-chain control voltages. This results in a seamless change in its gain, providing a warm, characterful sound that is highly sought after by musicians, producers, and engineers.

The Stereo Variable Mu Limiter Compressor offers two modes: COMPRESS and LIMIT. The COMPRESS mode provides a soft-knee ratio of 1.5 to 1, while the LIMIT mode starts at a sharper knee ratio of 4 to 1, escalating to a dramatic 20 to 1 when limiting over 12dB. Interestingly, the knee softens as more limiting is used, allowing for creative distortion effects.

Despite having a ganged input control, this device is far from mono-unfriendly. It features separate threshold and output controls for compensation, and its true strength shines when switched to LINK mode. This mode makes it an exceptional tool for final mix, 2-track, or mastering limiting and compression. As one reviewer aptly put it, using the Stereo Variable Mu Limiter Compressor is "like pouring a bowl of sweet cream over the mix." Experience the rich, full-bodied sound that this innovative audio equipment can bring to your music.

Manley Labs Compressor Features

  • Manley input & output transformers with nickel laminations in mu-metal cases with flat frequency response from 20Hz-25KHz
  • Balanced Inputs and Outputs (600 Ohms)
  • Fully differential ALL-TUBE circuitry using one each 5670, 5751 (or 12AX7), 7044 (or 5687) & 12AL5 per channel
  • Independently regulated B+ and Heater supplies
  • Hard-wire BYPASS switch
  • Stepped switch Input attenuator as of 10/2011. (older units use Silent dual-ganged potentiometer)
  • Recovery 5 steps: 0.2s, 0.4s, 0.6s, 4sec., 8sec
  • Variable attack: 15, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90 ms
  • Continuously variable threshold
  • Limit (4:1 to 20:1) or Compress (1.5 to 1)
  • HP SC: High Pass Side Chain Filter -3dB at 100Hz
  • Large Illuminated Sifam meters (older units before serial number MSLC61642 shipped before 12/2003 use: 26V 1.2W FesFESTOON LAMPS; Manley's Part Number: VAR016B) Order spare bulbs using our parts order form. (newest units after serial number MSLC61642 shipped after 12/2003 use white LED lighting)
  • Stereo Link Switch
  • Several units can be linked for Surround (custom order )
  • Maximum gain: 35dB
  • Max. output: +30dBu (26Vrms) 26dB Headroom
  • Less than 0.1% THD at 1KHz Noise floor: -85dB typical
  • Power Consumption (120/240VAC): 80 watts
  • Unit is factory set for 100V, 120V or 220-240VAC operation for original destination country's mains voltage
  • Operating Mains Voltage changeable with power transformer changeover switch and fuse value change
  • Mains Fuse Value for 100-120VAC operation: replace with 1.25A as of 10/2011
  • Mains Fuse Value for 220-240VAC operation: replace with 0.6A (600mA) as of 10/2011
  • Mains Fuse Type: MDA or MDL SLO-BLO Time delay 1 1/4" x 1/4"
  • Mains Voltage Frequency: 50-60Hz

Product Documents

User Manual

Key Features

  • Achieve pristine audio mastering with the Manley Stereo Variable Mu Limiter Compressor.
  • Sculpt dynamic sound effortlessly using the variable attack and release time controls.
  • Experience vintage warmth with the all-tube circuitry for rich, harmonic textures.
  • Mastering-grade compression: Glue tracks with the renowned Manley Stereo Compressor.
  • Enjoy versatile signal processing with selectable compression ratios for any source.
  • Precisely control gain reduction using the stepped threshold and output level controls.

What's in the box:

  • Manley Labs Stereo Variable Mu Limiter Compressor
  • IEC Power Cable
  • Manley 90 Day Limited Warranty (Extended to 5 Year with Registration)