Empirical Labs EL-DS-V DerrEsser – Dynamic High-Frequency Filter in 500-Series

The Empirical Labs EL-DS-V DerrEsser is a dedicated, single-slot API 500-Series module designed for dynamic high-frequency control. Derived directly from the Lil FrEQ’s dynamic section, it delivers smooth, level-insensitive de-essing, HF-limiting, and precision filtering—all with studio-grade musicality and recallable simplicity by Soundium.

Key Features

• Four functional modes:
  • DS (De-Ess) Mode: Level-insensitive control that attenuates sharp sibilant content by comparing high- to low-frequency balance—adjust once, and it stays smooth.
  • HF Limit Mode: Soft-knee limiting of high-frequency peaks that responds to HF energy, ideal for taming harshness with musical compression.
  • High-Pass Listen Mode: Lets you solo the high-frequency band for fine-tuning using the internal filter and LED feedback.
  • Low-Pass Listen Mode: Soloes low frequencies unaffected by the dynamics section, offering precision tuning via the 12 dB/oct filter.
• User-adjustable crossover: Tune the cutoff frequency for de-essing and filtering tasks, with accurate LED metering.
• Hard-Clip Indicator: A “BAD!” LED lights when input nears clipping, keeping you aware of overload risks.
• True bypass & clean circuit: Designed with military-grade switches and DC-coupled input/output, preserving audio purity when inactive.

Customer Benefits

The DerrEsser offers surgical control over harsh high frequencies—without the complexity typical of multiband or software options. Whether dealing with sharp vocals, sibilant guitars, or digital shimmer, its intuitive modes let you solve tone issues musically. Its small 500-Series form factor allows compact rack integration without compromise.

Quick Specs

• Frequency response: 3 Hz – 120 kHz (–3 dB points)
• Dynamic range: 115 dB from maximum output (0.5 % THD soft clipping) to noise floor (~–93 dBu)
• Distortion: 0.0035 % – 0.01 %, depending on mode and settings
• Input impedance: 20 kΩ (balanced), Output impedance: < 51 Ω
• Attack: < 1 ms; Release: 40 ms (fixed internally)
• Power consumption: ~4 W typical; 8 W max

What’s in the Box

• Empirical Labs EL-DS-V DerrEsser module

Use Cases / Ideal For

Perfect for engineers and musicians needing precise high-frequency control—be it live tracking, vocal smoothing, de-essing, or gentle HF taming on electronic instruments. The module’s modes adapt to a variety of tonal challenges with minimal tweaking.

Compatibility

Designed exclusively for API-style 500-Series racks. Provides analog-style sound sculpting with a compact vertical footprint—ideal for mixing room and stage racks alike.

Pros & Cons

✅ Pros:

• Vibrant analog de-essing without level dependency
• Modes include creative HF limiting and solo filters
• Precision LED metering and hard-clip detection

⚠️ Cons:

• Single-channel module—needs dual units for stereo use
• Requires powered 500-Series chassis (sold separately)

The Empirical Labs EL-DS-V DerrEsser refines high-frequency dynamics with elegance and precision—compact, intuitive, and dialed in for professional use by Soundium.