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Alto Professional CLE 4.0 main image

Alto Professional CLE 4.0

Alto Professional CLE 4.0

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Page last updated Aug 10, 2025

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For musicians and audio engineers seeking precision and reliability, the Alto Professional CLE 4.0 stands out as a versatile four-channel compressor, limiter, and peak limiter that delivers unmatched clarity. This powerhouse is engineered for clean, distortion-free compression, making it a staple in studios and live sound environments alike. With its Interactive Knee Adaption (IKA) technology, the CLE 4.0 offers both hard knee and soft knee compression characteristics, giving you the flexibility to tailor your sound to perfection.

Whether you're looking to tame unruly peaks or bring subtle warmth to your mix, the CLE 4.0's switchable high-pass filter ensures low-frequency signals won't overpower your tracks. The Interactive Gain Control (IGC) peak limiter further refines your sound by combining clipping with program limiter circuits for precise output management. With stereo coupling options and intuitive LED metering, monitoring your input and output levels is effortless. Plus, the CLE 4.0's servo-balanced inputs and outputs allow for seamless integration into any setup, with both 6.3 mm jack and XLR connectivity.

Built with high-quality VCA's and detent potentiometers, the CLE 4.0 guarantees low-noise operation and durability, making it a trusted choice for professionals who demand the best from their gear.

Key Features:

Four-channel compressor/limiter/peak limiter
Interactive Knee Adaption (IKA) for compression flexibility
Switchable high-pass filter for low-frequency management
Interactive Gain Control (IGC) peak limiter
Servo-balanced inputs and outputs with 6.3 mm jack and XLR connectors
Stereo couple function for channels 1&2 and 3&4
Accurate 8-digit LED meters for input, output, and gain reduction
Switchable operating level from +4 dBu to -10 dBu

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