Empirical Labs Pump Horizontal Format 500 Series Compressor

The Empirical Labs Pump 500 Series Compressor delivers powerful compression in a compact, single-channel 500 Series format. Known for its dynamic versatility, the Pump combines intuitive controls with high-quality sound. Its front panel features dedicated knobs for Attack, Release, Input trim, and Output gain, along with a unique AtMod (Attack Modification) knob, allowing precise transient shaping. The unit also offers Ratio and Bypass buttons, a Saturation mode for added harmonic richness, and colorful LED indicators to monitor ratio and gain reduction. A 110Hz high-pass filter (HPF) in the detector path and musical soft-clipping functionality complete its feature set, making the Pump ideal for professional audio production.

Specifications:

• Type: 500 Series VCA Compressor
• Channels: 1
• Controls: Input, Output, Ratio, Attack, Release, AtMod (transient shaping)
• Attack Range: 200 microseconds to 50 milliseconds
• Release Range: 50 to 600 milliseconds with Opto-style auto-release
• Ratios: 2:1, 3:1, 4:1, 6:1, 8:1, 10:1, 12:1, 20:1
• Frequency Response: 5Hz to 175kHz
• Dynamic Range: 125dB (0.5% THD with germanium diode soft clipping)
• Noise Floor: -101dBu at 0 Output
• Detector High-Pass Filter: 110Hz
• Power Requirements: ±16.5V DC, 100mA
• Bypass: Dedicated Bypass switch
• Module Slot Size: Single-slot 500 Series module

This compressor’s combination of precision control and musical warmth makes it a versatile choice for both studio and live applications.