Manley Variable MU Mastering The Works
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Manufacturer Information
Manley
https://www.manley.com
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A Modern Classic, a Pillar of the Manley Range
The Manley Variable Mu has established itself as the reference tube compressor on mix buses and mastering chains. Heir to the "remote cut" technology cherished by vintage units, it combines this with a contemporary and rigorous design by Manley Labs for exemplary reliability in studio environments.
For Whom and For What Uses?
Designed for mix and mastering engineers, the Variable Mu excels on a 2-bus, in stem processing, and on demanding tracks (vocals, bass, pianos, pads). Its stereo input control coupled with channel linking ensures a stable image; separate thresholds and outputs per channel allow for the fine compensations needed in production.
Key Features and Innovations
All-tube variable-mu compression
At the heart of the circuit, the 5670 dual triode continuously adjusts its gain under the action of the tube-rectified side-chain. The Compress mode adopts a gentle 1.5:1 ratio for transparent "glue," while the Limit mode ranges from 4:1 up to 20:1 to control peaks, with a knee that softens as the reduction increases.
Musical envelope control
Variable attack from 25 to 70 ms and five selectable release times ensure precise groove shaping. Harmonic saturation can also be exploited by pushing the input and lowering the output, even with little compression.
Premium audio chain
Manley input/output transformers with nickel laminations housed in mu-metal cases and regulated B+ and heater supplies offer very low noise, controlled distortion, and a perfectly flat response from 20 Hz to 25 kHz.
Studio ergonomics
Stereo linking makes final mix processing immediate; multiple units can be chained for surround configurations. Since 10/2011, the stepped input attenuator provides recall and precision during sessions.
Technical specifications
| 5-step release | 0.2 s, 0.4 s, 0.6 s, 4 s, 8 s | Noise floor | typically -85 dB |
| Variable attack | 25 ms to 70 ms | Power consumption (120/240 VAC) | 80 W |
| Modes | Limit (4:1 to 20:1) or Compress (1.5:1) | Mains fuse for 100-120 VAC | replace with 1.25 A (from 10/2011) |
| HP SC | side-chain high-pass filter at -3 dB at 100 Hz | Mains fuse for 220-240 VAC | replace with 0.6 A (600 mA) (from 10/2011) |
| Maximum gain | 35 dB | Fuse type | MDA or MDL SLO-BLO time-delay, size 1.25 x 0.25 inch |
| Maximum output | +30 dBu (26 Vrms), 26 dB headroom | Mains frequency | 50-60 Hz |
| Distortion | less than 0.1% THD at 1 kHz | ||
Questions frequently asked
Is the Manley Variable MU Mastering The Works suitable for stereo mastering?
The stereo link and coupled input control stabilize the image when processing a final mix. Separate threshold and output settings are provided for each channel. Multiple units can be chained in a surround setup.
What compression ratios are available?
The Compress mode applies a 1.5:1 ratio for gentle compression. In Limit mode, the ratio ranges from 4:1 to 20:1 to control peaks.
What attack and release times does this tube compressor offer?
Attack is adjustable from 25 to 70 ms. Five release settings are available: 0.2 s, 0.4 s, 0.6 s, 4 s, and 8 s.
Does the compressor have a side-chain filter for low frequencies?
An integrated high-pass side-chain filter is included, with the -3 dB point set at 100 Hz.
What output level and headroom does it provide?
Maximum output reaches +30 dBu, or 26 Vrms, with 26 dB of headroom. Maximum gain is 35 dB. Claimed distortion remains below 0.1% THD at 1 kHz.
