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The Empirical Labs EL-Rx-H DocDerr is a 500 series channel strip that’s all about tone. The unit offers digital control over its preamp, EQ, compressor, and saturator sections. An onboard microcontroller governs each of the four analog EQ sections, as well as a brand new dynamics section that shaves digital transients via compressor and saturation circuits.
The unit’s low-noise preamp is compatible with both instrument- and line-level signals, and routes them to four EQ sections. The EQ section combines a two-position HPF with three parametric bands. There’s also an internal jumper that allows the DocDerr to function as an instrument preamp with a whopping 16dB of gain.
Crucially, the DocDerr’s Mix knob blends the uncompressed signal with the compressed/saturated signal, creating parallel compression that yields a wealth of desirable sonic possibilities.
This is the HORIZONTAL version of the DocDerr.
The Empirical Labs EL500 500 Series Rack is comprised of an extremely quiet power supply, clean mounting, and both XLR and phone rear panel ins/outs that allow for precise interfacing with almost any external gear.
Additionally, there’s even a 1/4” instrument preamp/direct box present on the front panel that automatically switches the left 500’s input to the front jack whenever something is connected. Finally, the EL500 contains switches for activating 48v Phantom Power and linking the compressors.