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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 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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4.2 ★★★★★
Based on 792 reviews
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Product Reviews
★★★★★ 1
Very disappointed
Unfortunately I ended up being very disappointed with this purchase, after about two weeks of use, it just stopped performing. Not sure what happened but it just stopped releasing the ball and I don't know why, it had no flexibility left to it. I'm not doing a very good job of trying to explain why it quit working but suffice it to say, it became useless after a couple of weeks. Broke my neighbors dog's heart, lol.
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Reviewed in the United States on November 20, 2025
★★★★★ 5
This is a big ball.
Larger than I thought but still a great toy for a heavy chew pup, easy to toss and won't go under funiture. She has the same ball in a 5 inch size so I know it's quality and will last. Can't wait for Summer, will make a great yard ball.
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Reviewed in the United States on March 22, 2026
★★★★★ 5
Second one, first one lasted a good while
We leave it outside in the weather with solid results for our backyard dog, and the dog loves this thing. It's our go to toy for her, ... perfect for kick to fetch, tug of war, hide in the shirt, bump the human leg when it is wet, etc. ;) The first one we used and used and finally it started to show too much weathering, mildew, and finally breaking after like 1.5 years... we have extremely hot and wet weather here. When new though, these balls take a pounding. Our 50 pound dog can play tug of war to the extent we can pick her up while she holds onto the ball with her teeth. The ball doesn't flinch and the dog loves it. Kicking it is fun because you can give it a wallop and it won't go over the fence since the design absorbs a fair bit of the kick energy, but it is still enough for an adult or teen to send it about 1/4 an acre away. What else... oh the dog has a funny habit of finding the one spot that isn't an empty pentagon... as in the plastic is filled in there... and she likes to bit on that part especially during tug of war. I should also mention our dog literally breaks apart and sometimes eats sticks and twigs in the yard, can't be healthy, so a nice diversion is this ball that she will chew on once in a while without destroying it.
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Reviewed in the United States on July 10, 2022
★★★★★ 5
Absolutely love this brand of ball for my dog
I end up replacing these every couple years, yep that's right, years. My border collie will grab this ball in his mouth and then kick another ball around. Don't know why he has to have something in his mouth to play soccer, but he is unique. He managed to tear one of these up when he was in his teething stage, but it took him months, and I took it away as soon as he managed to remove a piece of it. Otherwise, we usually lose these much more often than them getting destroyed through constant chewing, and I suspect heavy weathering outside for an extended period of time. Nowadays he doesn't chew on rubber nearly that often, he has developed his own picky preferences. This ball is his must have for playing around. He loves to drop it down the stairs and play fetch with himself. It's easy for him to grab, it isn't heavy so we don't worry about furnishing, walls, or family members when he is tossing it around. It is much more durable than most, with the exception of really heavy chewers/teething, even then it held up for a long time. As long as you are careful to remove it if they manage to chew through I would even try it out with teething puppies. The lawnmower is also this balls nemesis, it loses every time. If only I could convince the dog that he needs to stop sacrificing toys to the lawnmower :-)
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Reviewed in the United States on January 1, 2025
★★★★★ 5
Will Last!!!
My Saban is a black lab/pittie mix and is a very aggressive chewer with the bulldog jaws. I had bought the large ball for him and to be honest I didn't think it would be as big as it is or as heavy 😂😂😂!!! It's made of a very durable plastic and is holding up extremely well to his chewing on it!!! I'll be honest and say that unless you're using it outside and have some really good muscles in your arm that I would recommend buying this in the smaller size!!!! I normally play with him inside with his toys when the weather isn't good for going outside, but I don't throw this one inside because #1 it's so heavy and big that I can't throw it very good and # if I was to play with it inside I'm afraid the weight of it would break something!!! I would say that this is a great quality and very durable, but I wouldn't buy the large one again!!! I would definitely recommend this brand in a smaller size ball 👌 😊😊
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Reviewed in the United States on October 11, 2023