Manley Stereo Variable Mu Limiter and Compressor

The Manley Stereo Variable Mu is a classic all-tube compressor/limiter that delivers the legendary warmth and musicality of Variable Mu technology. Designed for stereo bus, mastering, and tracking applications, this 2U rack unit combines four 6BA6, two 6V6, one 5670, and one 12AT7 tubes to provide rich harmonic saturation and smooth gain reduction. With variable attack (25ms to 70ms), release (0.1s to 5s), and compression ratio (1.5:1 to 10:1), it offers precise control over dynamics. The unit features both Compress and Limit modes, internal or external sidechain, and large VU meters for input, output, and gain reduction. Balanced XLR inputs and outputs ensure professional connectivity. The internal power supply is selectable for worldwide voltage.

Advantages

All-tube Variable Mu design delivers classic analog warmth and musical compression. Stereo operation with linked or independent channels. Versatile attack, release, and ratio controls. High headroom with +30 dBu maximum output. Internal sidechain with external insert option. Rugged 2U chassis for studio integration.

Suitable for

• Stereo bus compression in mixing and mastering
• Tracking vocals, bass, and drums with tube character
• Broadcast and post-production dynamics control
• High-end studio installations requiring transparent yet musical limiting

Key specifications

• Type: Tube/Valve Compressor/Limiter
• Channels: 2 (Stereo)
• Circuitry: All-Tube, Variable Mu
• Tubes: 4x 6BA6, 2x 6V6, 1x 5670, 1x 12AT7
• Frequency Response: 20Hz - 20kHz (±0.5dB)
• Max Gain: 20 dB
• Max Output Level: +30 dBu
• Input Impedance: 600 Ohms (Transformer Balanced)
• Output Impedance: 600 Ohms (Transformer Balanced)
• Connectors: XLR Balanced Input/Output
• Attack Time: 25ms to 70ms (Variable)
• Release Time: 0.1s to 5s (Variable)
• Compression Ratio: 1.5:1 to 10:1 (Variable)
• Modes: Limit (4:1 to 20:1), Compress (1.5:1 to 4:1)
• Sidechain: Yes (Internal or External)
• Metering: Large VU meters (Input, Output, Gain Reduction)
• Rack Size: 2U
• Power Supply: Internal, Selectable Voltage

Recommendations

The Manley Stereo Variable Mu is an industry standard for stereo bus compression. Its all-tube signal path and Variable Mu topology provide a unique, musical response that enhances any mix. Ideal for professionals seeking classic analog dynamics with modern reliability.