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Description
EMPIRICAL LABS DocDerr ELRX-H - 500 Series - Multi-Purpose Tone Module (Horizontal Version)Six Sections of Processing 3x Parametric Bands of EQ 1x High Pass Filter Aggressive Compressor Circuit Mix Knob Blends Compressor w Dry Signal Musically Saturates Like Analog Tape EL500 Rack w Super Quiet 16V Supply Stereo Link Switch Built In Instrument Input D. I. Hand Built and Calibrated in the USA The DocDerr ELRX H from Empirical Labs is a horizontal multi purpose tone enhancement module that houses six different sections of digitally controlled
- Six Sections of Processing
- 3x Parametric Bands of EQ
- 1x High Pass Filter
- Aggressive Compressor Circuit
- Mix Knob Blends Compressor w/ Dry Signal
- Musically Saturates Like Analog Tape
- EL500 Rack w/ Super Quiet 16V Supply
- Stereo Link Switch
- Built-In Instrument Input D.I.
- Hand-Built and Calibrated in the USA
The DocDerr ELRX-H from Empirical Labs is a horizontal multi-purpose tone enhancement module that houses six different sections of digitally controlled analog processing�and designed for any API 500- Series enclosure. The DocDerr features a low-noise preamp capable of working with line level or instrument level signals, 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 unparalleled instrument preamp with 16 dB of gain, great for acoustic guitar, bass, synths, exotic plucked instruments, and more.
The EQ is followed by a dynamics section which offers compression and a musical tape emulation circuit that softens and tames high frequencies and transient spikes. The DocDerr features the Mix knob, which allows the user to blend the uncompressed EQ's signal with the compressed and saturated signal. The DocDerr is great for tracking, fine-tuning tracks during mixing, and studio quality tone control.
DocDerr Module
- Low noise line input, or instrument preamp, with compression and six digitally controlled analog sections of processing
- Four sections of equalization including one high pass and three parametric bands
- Complex compressor envelope generator that is fast, yet musically saturates at high gain reduction and features a program dependent release
- Saturation circuitry that scrunches the highs, allows hotter levels, and uses filtering combined with germanium clip circuitry to soften loud high frequencies
- Mix control to allow user to blend an uncompressed equalized signal back in with the compressed saturated signal (when on 0, only the equalized signal is put out)
- DC coupled input and outputs
- Selectable single ended or differential output (adds 6 dB gain)
- Traditional and digitally controlled analog
- Hard clip indicator lights illuminate when the sound level is within 1 dB of hard clipping and monitors many sections for internal clipping
- All metal film and Roederstein resistors in the audio path
UPC: 854682006115
In the Box
EMPIRICAL LABS DocDerr ELRX-H - 500 Series - Multi-Purpose Tone Module (Horizontal Version)
- Limited 3-Year Warranty
| Frequency Response | 3 Hz to 180 kHz on EQ section (-3 dB points) |
| Dynamic Range | -120 dB from maximum output (0.5% THD soft clipping) to minimum output, noise floor typically -91 dBu |
| Distortion Range | 0.0006 and 12% at 1 kHz |
| Outputs | DC coupled |
| Input Impedance | 120 kOhms in instrument mode, 20 kOhms in balanced line in mode |
| Output Impedance | 75 ohms |
| Maximum Output | +28 dBm |
| Maximum Input Before Clipping | +22 dBm, line in mode |
| Attack Time | 1 mS |
| Release Time | 0.2 seconds, program dependent, fixed internally |
| Power Consumption | Typical: 2 W Maximum: 4 W |
| Power Supplies | 16 V |
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4.8 ★★★★★
Based on 993 reviews
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Product Reviews
★★★★★ 5
Wait to see
I am just starting to use it and I have to use it for a couple of weeks to help me know if it’s works but what I notice after applying it to my hair it’s just makes it so smooth and soft
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Reviewed in the United States on January 13, 2026
★★★★★ 5
Better than expected
Better than expected, I am absolutely pleased with this product. My bald spot starting showing signs of growth after the first week.
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Reviewed in the United States on January 4, 2026
★★★★★ 5
Lashes like Garbo
Size: 0.27 Fl Oz (Pack of 1), Style: Mascara/Lash Primer, Size: 0.27 Fl Oz (Pack of 1), Style: Mascara/Lash Primer
I think this might be my new go to mascara.
I have the teeniest tiniest lashes ever, they are straight and stick out from my eyelids and without mascara I look like I have no lashes so it’s a struggle finding mascaras that make my lashes look lush.
Let me start off by saying that the primer is amazing.
As soon as I put it on my lashes grew over twice in length!
It didn’t clump and separated my lashes like whoa( the clumping with these lash fiber or extra lengthening mascaras is always horrendous so that was a wonderful surprise), it dried in about 20 seconds and then I put on the coal black mascara.
Vavoom ladies!
Instant fabulous lashes.
So far I have experienced zero flaking after wearing for long periods of time , it hasn’t smudged or melted when I’m dancing up a storm or getting my workout on and the length of my lashes is practically miraculous.
It is not cry proof.
It’s super easy to remove and doesn’t tear out any of my eyelashes though, so that’s another plus!
Also, I have celiac disease and a host of other random allergies and am allergic to SO MANY products it’s ridiculous, but luckily I am not allergic to this magic mascara.
I recently discovered that this doesn’t smudge on my bottom lashes either!
I’m almost 40 and I have never found a mascara that didn’t smudge on my bottom lashes. I’m so oily that even waterproof ones didn’t work!
I stopped wearing it on my bottom lashes for anything but photo shoots after 20yrs old because the smudging made me look like an old lady with terrible makeup skills,but now I can once again rock liner on my bottom lashes!
I included a terrible picture ( I hate getting my picture taken!) and tried to crop it so you can get an idea of how amazing this mascara is( look at those lashes practically touching my brow bone!),because I know I always want to actually see the results of people using the product, so hopefully it helps. :-)
Ps: I don’t have mascara on my bottom lashes in the pic as I didn’t discover it was even a possibility for me until I bought a tube for my bestie ( another oily faced queen)and she told me there was no smudging:-O
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Reviewed in the United States on March 21, 2019
★★★★★ 5
Great mascara, my new favorite!
Size: 0.27 Fl Oz (Pack of 1), Style: Mascara/Lash Primer
I think this is my favorite mascara of all time! lol!
Goes on very easy and not clumping. Makes my eyelashes look longer.
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Reviewed in the United States on June 3, 2026
★★★★★ 4
Mascara is good, but don’t expect the best - smudges & flakes sometimes
Size: 0.27 Fl Oz (Pack of 1), Style: Mascara/Lash Primer
This mascara is very good for lengthening when you use the primer. I’m not sure I’ve noticed a volume/thickness increase, but have noticed lash length does look longer. I usually give it about 30 seconds for the primer to dry before using the mascara, otherwise it does clump a bit. I would also recommend wiggling both wands along your lashes during application to avoid clumps. In general I do like this, but noticed a few other important points: it will definitely run a lot if you get it wet (e.g. rain or crying), it will flake or smudge a little by the end of the day - especially if you rub your eyes, and while it does not make my eyes itch, I found it best to put in my contacts AFTER the mascara is fully dry. I’ve accidentally got some mascara a few times in my eye with the wand/trying to smooth out clumps and it totally made my contacts (daily wear type) useless after that. That all probably sounds like the mascara isn’t worth it, however I still actually like this mascara. I’d say it’s perfect for an average day’s wear, just not an extended day or in some cases. It does come off fully for me.
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Reviewed in the United States on December 31, 2022