ST-CL2

RDL ST-CL2 - Compressor/Limiter - Line Level

The RDL ST-CL2 is a high-performance compressor/limiter from the STICK-ON® series, designed to maintain a consistent average output level and provide effective peak control across a wide range of input levels. It operates with line-level signals, supporting both balanced and unbalanced connections, and offers fully automatic operation with minimal setup.

The ST-CL2 uses multi-stage incremental gain reduction, driven by three internal timing circuits that respond sequentially to varying signal amplitudes and energy levels. Its soft-knee compression threshold and adaptive compression ratio ensure smooth, inaudible gain control without distortion. Two LED indicators provide visual feedback for normal and heavy compression, simplifying input level adjustment.

Functionality

• Automatic compression and peak limiting for line-level audio
• Supports balanced and unbalanced input/output connections
• Soft-knee threshold and adaptive compression ratio
• Three-stage timing circuits for precise dynamic response
• Stereo operation via COUPLE terminal
• LED indicators: NORMAL (yellow) and HEAVY (red)
• Ultra-low noise and distortion performance

Features

• Input: 10 kΩ balanced (may be unbalanced)
• Input signal range: -10 to +4 dBu (adjustable), max +22 dBu
• Output: 150 Ω balanced (may be unbalanced)
• Output signal range: OFF to +8 dBu (adjustable)
• Frequency response: 10 Hz to 20 kHz (±0.2 dB)
• Noise: < -78 dB (unweighted, +4 dBu)
• THD: < 0.05% (below threshold), < 0.1% (3 dB GR), < 0.15% (6 dB GR)
• CMRR: > 60 dB (50-120 Hz)
• Attack time: 500 ms (average), <10 ms (fast), instantaneous (limiter)
• Release time: auto-adjusting up to 500 ms
• Compression ratio: auto-adjusting 1.5:1 to 10:1
• Peak limiter: INF:1
• Power: 24 V DC (SupplyFlex™)
• Mounting: STICK-ON® module
• Stereo coupling: COUPLE terminal for dual-unit operation

The RDL ST-CL2 is a dependable and flexible solution for AV professionals seeking precise level control without compromising audio quality. Its automatic operation and compact design make it ideal for sound reinforcement, broadcast, and studio applications.