ONE LA 500
Classic Tube Opto-Compressor
ONE LA 500 brings the timeless sound of the classic LA-2A opto compressor into the compact 500-series format—without compromise. Designed as a true high-voltage tube module, it operates internally at 250 V DC via an onboard converter, ensuring authentic tube behavior in any standard 500-series rack. With just two knobs and a compressor/limiter switch, ONE LA 500 delivers effortless, musical compression that enhances vocals, strings, bass, and drums with rich harmonics and smooth dynamics. Used as a stereo pair, it also excels as a warm, characterful bus compressor.
Classic Opto Compression in a 500-Series Format
ONE LA 500 is a high-voltage, tube-driven opto compressor inspired by the legendary Teletronix ’68 LA-2A. Unlike typical 500-series designs, it runs its tubes at a true 250 V DC, preserving the response, depth, and harmonic structure that define classic opto compression.
Simplicity That Delivers Results
With only two controls and a compressor/limiter switch, ONE LA 500 is intentionally straightforward. This minimal interface encourages fast decisions while delivering consistently musical results across a wide range of sources.
Hand-Built with Premium Components
Each unit is hand-assembled using carefully matched 1% metal-film resistors, Wima capacitors, and JJ tubes. Every ONE LA 500 is individually calibrated to ensure consistency, reliability, and authentic performance.
Transformer-Balanced, Studio-Ready Design
Three audio transformers—IGS Custom units in the signal path and an OEP transformer in the sidechain—provide depth, punch, and excellent isolation. A user-replaceable photocell further extends serviceability and longevity.
From Tracking to Bus Compression
Equally at home on vocals, strings, drums, and bass, ONE LA 500 can also be paired for stereo operation, making it a powerful and characterful bus compressor for modern hybrid workflows.
Videos
Specifications
| Device Type | Optical Compressor |
| Hard Wire Bypass | Yes |
| Stereo Link | Yes (custom order) |
| Audio Transformers | Yes, IGS Custom |
| Input Impedance Balanced |
600 Ω, IGS Custom transformer |
| Output Impedance Balanced |
600 Ω, IGS Custom transformer |
| Operating Level | +4 dBu |
| Maximum Input Level | +20 dBu |
| Maximum Output Level | +21 dBu |
| Dynamic Range | 100 dB |
| Maximum Gain Reduction | 32 dB |
| Maximum Gain | 32 dB |
| Noise Level | −99 dBA |
| Attack Time | 10 ms |
| Release Time | 0.5 – 5 s (50% @ 60 ms) |
| Ratio | 4:1 (COMP), 100:1 (LIM) |
| Frequency Response | 8 Hz – 20 kHz ±1 dB |
| THD+N | 0.002% @ 0 dBu |
| Power Supply | API standard with internal DC-DC conversion (250 V DC tube supply) |
| Power Consumption |
8.16 W Slot #1: 190 mA @ +16 V, 170 mA @ −16 V Slot #2: 150 mA @ +16 V, 0 mA @ −16 V |
| Shipping Weight | 3 kg |
| VU Meter | Yes, backlit GR meter |
| Tube Complement | ECC802, ECC803 |
