Sound Pure's Take
The Manley Nu Mu is one of those rare compressors that feels as much like an instrument as it does a piece of outboard gear.
At its core, it’s a variable mu design, but with a level of control and flexibility that makes it far more versatile than most in that category. It can be smooth and transparent, gently shaping dynamics in a way that feels almost invisible—or it can lean into its tube character, adding density, glue, and a sense of weight that’s hard to replicate any other way.
What really stands out is how effortlessly the Nu Mu handles mix bus and mastering duties. It has that unmistakable ability to “pull things together,” enhancing cohesion without flattening the life out of a mix. The blend control and sidechain options make it easy to dial in exactly the right amount of compression, whether you’re going for subtle polish or a more pronounced effect.
And then there’s the tone. There’s a richness and dimensionality here that only great tube gear delivers—never muddy, never overhyped, just bigger and more finished in a way that feels natural.
For engineers looking for a high-end compressor that combines classic tube warmth with modern control, the Nu Mu is a standout. It’s the kind of piece you put across a mix and immediately miss when it’s gone.
From Manley Laboratories Inc
Featuring Manley’s new HIP function, the Manley Nu Mu finesses dynamic control to bring up lower level details without knocking the life out of exciting transients. Smartly engineered to build efficiently and aesthetically designed to elicit ravishing compliments from your clients, both visually and ergonomically, the Manley Nu Mu breaks new ground in performance and value, all proudly hand built in California, of course!
“HIP” Control
The “HIP” control allows compression to happen at lower volumes (lower in the dynamic range spectrum, but leaves
the louder dynamics alone while still compressing the overall signal. You get louder soft sections with the original dynamics of the louder sections.
Features:
- Manley IRON® input transformers
- 4 x hand-matched 6BA6 vacuum tubes
- Balanced XLR inputs & outputs
- Manley HIP function raises soft dynamics without squashing louder passages
- High Voltage Switched Mode Power Supply custom designed for our vacuum tube audio circuits
INPUT Level Preset 3-way switches -3dB, 0, +3dB
Continuously variable OUTPUT level controls
Unity Gain set INPUT to "0" and OUTPUT control to 11 o’clock. (Input source Z= 150 Ohms, Output load Z= 100 kOhms)
- Maximum input level
- (1 kHz Sine, <0.3% THD+N) -3 = +25 dBu 0 = +21 dBu +3 = +18 dBu
- Maximum GAIN
- 13dB
- GAIN makeup
- 10dB (gain above unity)
- Output Headroom
- 23dB (referenced to +4dBu)
- Variable ATTACK control
- 13msec - 130msec
- RECOVERY switch 5 steps
- 0.1s, 0.16s, 0.32s, 0.64s, 1.7sec.
Continuously variable THRESHOLD controls
Hardwired Relay Bypass Switch
- Ratio Mode switches between LIMIT (1.5
- 1 to 12:1) or COMPRESS (1.2:1 to 3:1)
- HP SC
- High Pass Side Chain Filter -3dB @ 100Hz @ 6dB per Octave
Stereo Link establishes Left-Master dynamic control for THRESHOLD, ATTACK, and RECOVERY controls
Beautiful illuminated stereo VU meters read Gain Reduction or Output Level
Sidechain INSERT per channel via 1/4" TRS jack TIP=SEND, RING=Return, SLEEVE=Ground
- Maximum Output
- +27dBu (18Vrms) into 100K Ohm load; +24.5dBu (13Vrms) into 600 Ohm load. (1Khz Sine, < 0.3% THD+N, BW 20Hz - 20kHz).
- Frequency Response
- - 0.8dB @ 20Hz, -0.5dB @ 50kHz
- Total Harmonic Distortion
- <0.05% THD+N (1kHz Sine, +4dBu, BW: 20Hz - 22kHz)
- Noise floor
- -85dB typical (BW: 20Hz - 22kHz)
- Dynamic Range
- 112dB
- Signal to Noise Ratio
- 89dB (referenced to +4dBu)
- Common-Mode Rejection Ratio (CMRR)
- 74dB (BW: 20Hz - 22kHz, +4dBu, 1kHz Sine)
- Output Impedance
- 100 Ohms
- Input Impedance
- -3dB= 1 kOhms, 0dB= 2.5 kOhms, +3dB= 4.5 kOhms
- AUTOMUTE warmup delay
- 30 Seconds
- Power consumption
- 35 Watts
- Standby Power Consumption
- ?? Watts
- Operating mains voltage
- 90 to 254 VAC (internal universal supply)
- Mains Voltage Frequency
- 50-60Hz
- Dimensions
- 19" x 3 1/2" x 7" (occupies 2u)
- Unit Weight
- 8.5 lbs.
- Shipping weight
- 11.5 lbs.
Warranty
This item is sold without the Sound Pure 3-year warranty (used / B-stock / dealer-exempt). Coverage terms for items in this category live in Terms & Conditions, Section 27.
Returns
Try Before You Buy: take it home, commit only when it's right. Program details →
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Sound Pure Studios · Durham, NC
Come hear it in our control rooms.
Sound Pure is a working studio in Durham, NC — a 1,000 sq ft live room and two pro control rooms. Book a session to audition gear in a world-class acoustic space before you buy.