A studio favourite with a reputation for attitude and colour, the Empirical Labs DocDerr EL-Rx is a compact 500-series channel strip designed to sculpt and energise any signal. Created by Dave Derr (of Distressor fame), the DocDerr combines a pristine preamp with a flexible parametric EQ and a secret weapon: the “Mix” knob with ELI’s signature “DerrEsser” dynamics circuit for automatic de-essing and smooth transient control. Its wide-ranging tone shaping—from subtle warmth to aggressive grit—makes it equally at home sweetening vocals, clamping down spiky cymbals, or pushing synths and guitars forward in a mix. Whether you're tightening up a podcast voiceover or adding edge to your drums, this little doctor operates with surgical musicality and unmistakable Empirical Labs punch.
Specifications
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500-series mono channel strip
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Three-band parametric EQ with overlapping bands
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Fixed low- and high-shelf filters
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Built-in “DerrEsser” dynamics processor
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Mix knob for dry/wet blending
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Ultra-clean Class A line-level input
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Frequency range 10Hz–40kHz
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All-analogue signal path
Includes original box.
Product Specs
- Item Number: 37303
- Make: Empirical Labs
- Model: DocDerr EL-Rx
- Condition: Very Good
- Finish: Black
- Categories: pro-audio ⇒ 500-series
- Made In: United States
- MPN: 37303