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Input: 10 kO Balanced (may be connected unbalanced)
Input Signal Range: -10 to +4 dBu, adjustable (for 6 dB gain reduction); +22 dBu maximum
Output: 150 O Balanced (may be connected unbalanced)
Output Signal Range: OFF to +8 dBu, adjustable
Frequency Response: 10 Hz to 20 kHz (± 0.2 dB) over full compression range
Noise below +4 dBu output: < -78 dB (unweighted; +4 dBu input/output)
Total Harmonic Distortion: < 0.05% @ 1 kHz below compression threshold; < 0.1% @ 1 kHz with 3 dB gain reduction; < 0.15% @ 1 kHz with 6 dB gain reduction
CMRR: > 60 dB (50 to 120 Hz)
Attack Time: Averaging Compressor: 500 ms (+4 dBu input); Fast Compression: <10 ms (+20 dBu input); Peak Limiting: Instantaneous
Release Time: Automatically adjusting up to 500 ms
Compression Ratio: Automatically adjusting 1.5:1 to 10: 1
Peak Limiter: INF: 1
Interconnection: Stereo COUPLE interconnection provided
Indicators (2): Yellow LED for NORMAL Compression, Red LED for HEAVY Compression
Ambient Operating Environment: 0° C to 55° C
Power Requirement: 24 Vdc @ 50 mA, SupplyFlex
Package Type: Cardboard Box
Package Dimensions: 2 x 2 x 4 in.
Shipping Weight: 0.2 lbs.
WEEE weight: 0.145 lbs.
Tariff code: 8518.40.2000

The ST-CL2 is a high performance compressor/limiter designed to maintain a constant average output level and effective peak control over a wide range of input levels. The input and output are line level and each may be wired balanced or unbalanced. Trimmers provide adjustment for all usual professional and consumer audio input and output levels. Internal detectors feed three timing circuits. The threshold level and slope of each timing circuit are incremented to respond sequentially to signals of varying amplitude and energy levels. The ST-CL2 features a soft-knee compression threshold and compression ratio which automatically adjust to the program material. Two LED indicators cover the incremental ranges of compression, making setting of the input level quick and easy. Two ST-CL2s may be strapped together for stereo operation by connecting the coupling terminals between the two modules.


  • Positive Audio Level Protection
  • Smooth Inaudible Gain Reduction
  • Tight Audio Peak Control
  • Very Low Noise Compressor
  • Multi Stage Incremental Gain Reduction
  • Fully Automatic Operation
  • Superb Performance with Minimal Setup
  • RDL® SupplyFlex™ Power Input Configuration

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