The Empirical Labs EL/Rx-H DocDerr is an extremely low-noise preamp capable of working with line level or instrument level signals
The Empirical Labs EL/Rx-H DocDerr is a
500 series multi-purpose tone enhancement module that houses six
different sections of digitally controlled analog processing. With over
two years of meticulous development and testing behind it, the DocDerr
provides an unprecedented combination of power and musicality in a
compact, easy to use format. Empirical Labs' first compressor in the API
The Empirical Labs EL/Rx-H DocDerr is an extremely low-noise preamp capable of working with line level or
instrument level signals, is followed by four sections of EQ combining a
two position high pass filter with three parametric bands, each with
its own set of carefully tuned frequency presets. An internal jumper
can turn the DocDerr into an unparralled instrument preamp with 16dB of
gain, ideal for acoustic guitar, bass, synths, exotic plucked
The versatile EQ is followed by a unique dynamics section which offers
renowned Empirical Labs compression at an unprecedented price, and an
extremely musical tape emulation circuit that softens and tames high
frequencies and transient spikes. We believe it’s the best single knob
“knee” compression available in this format.
One of the pivotal features of the DocDerr is the “Mix” knob which
allows the user to blend the uncompressed EQ’s signal with the
compressed and saturated signal. This parallel compression technique,
used by top recording and mixing engineers for many years unlocks a
whole world of sonic possibilities.
Like all ELI 500 series modules, the EL-Rx is available with either
horizontal or vertically oriented front panel configurations, and is
“Linkable” for using our famous compression on stereo sources.
The DocDerr is ideal for tracking, for fine-tuning tracks during mixing,
or as a killer solution for the gigging "acoustic" musician in search
of studio quality tone control. It is indeed a Tone Doctor…err… DocDerr.
As far as value, it’s hard to beat 500 Series compatible modules. Their
smaller physical size let you get a lot of performance out of a smaller
space, they tend to cost less than their larger counterparts, and – the
best part – you can customize your own combinations of them.
When ELI started making our own 500 series products, we looked at the
power supplies on the market and couldn’t help but notice a need for a
better single height dual module rack unit. On other single height rack
units, the modules protrude from the front panel, and don’t look sturdy
or attractive. Power supplies were often noisy, frequently reducing the
performance of any module mounted in them. Also, only XLR ins and outs
were provided to the user, limiting the device’s applications.
The Empirical Labs EL500 rack eliminates these obstacles. At the heart
of the unit is a super quiet power supply - over 30 dB quieter than some
supplies we've seen - that will ensure optimal performance from any
All 500 series modules will flush mount cleanly in the EL500, providing a
much more professional look and feel. The EL500 offers both XLR and
phone rear panel inputs and outputs to allow it to interface perfectly
with any system.
In addition, a ¼” instrument preamp/direct box input is provided on the
front panel, which will automatically switch the left 500 module’s input
to this front phone jack once something is plugged into it – a feature
we’re sure will prove to be extremely useful. In fact, it has become the
first call bass DI for many engineers. Switches to link compressors
and engage a 48V phantom supply are also provided.
Whether you’re already invested in 500 series modules or they’re
something you’re thinking about adding to your arsenal, the EL500 rack
will make any 500 series compatible module perform ideally and interface
effortlessly into just about any audio application.
Empirical Labs EL/Rx-H DocDerr Key Features
- Six digitally controlled sections of analog processing
- Frequency response - 3 Hz to 180 kHz on eq section (-3dB points).
range - 120 dB from maximum output (.5%THD soft clipping) to minimum
output. Noise floor with Mix on 0 is typically – 91dBu.
- Distortion range - between .0006% and 10% at 1KHz, depending on mode and settings.
- Maximum Input before hard clipping - +22dBm, “ Line In” mode. Maximum Output (Mix at 0) - +28.5dBm
Dynamics Time Constants - Attack time is around 1mS. Release .2 sec,
fixed internally. Stereo Linkable for stereo tracks. With the EL500
powered rack, the push of a button enables linking.
Impedance - 120k Ohm, Instrument In Mode, output impedance is less than
75 ohms. 20K input impedance in balanced Line in mode.
- Guitar adaptor cable included
Don’t forget to check out RSPE’s Rack Revolution,
a virtual 500-series rack builder that lets you custom-configure the
perfect 500-series lunchbox for your studio, DAW, or mobile recording
rig. RSPE carries every 500-series module imaginable, including mic
preamps, compressor-limiters, equalizers, and 500 power racks.
The sound and
unique features of the Empirical Labs Distressor have made it a staple
for audio engineers all over the world. For more information, call or
chat with an RSPE representative today.