SKU: 10056754319

EMPIRICAL LABS DerrEsser ELDS-H 500-Series Dynamic High-Frequency Fixer (Horizontal Version)

Sale price$35781.75 Regular price$39757.50
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Description

EMPIRICAL LABS DerrEsser ELDS-H 500-Series Dynamic High-Frequency Fixer (Horizontal Version)High Performance Desser High Frequency Limiting Hard Clip Indiator True Bypass Military Grade Switches and Relays Hand Built and Calibrated in the USA The DerrEsser ELDS H from Empirical Labs is a horizontal multi function dynamic filtering device, designed for API 500 Series enclosures. In its basic DS mode, it is an effective, level insensitive de esser, a device that will adjust the high frequency gain on overly treble y or spiky vocals or other

  • High-Performance Desser
  • High-Frequency Limiting
  • Hard-Clip Indiator
  • True Bypass
  • Military-Grade Switches and Relays
  • Hand-Built and Calibrated in the USA

The DerrEsser ELDS-H from Empirical Labs is a horizontal multi-function dynamic filtering device, designed for API 500-Series enclosures. In its basic DS mode, it is an effective, level-insensitive de-esser, a device that will adjust the high-frequency gain on overly treble-y or spiky vocals or other sources in an extremely musical manner. However, unlike other de-essers, the device allows for multiple uses of its circuitry. As a de-esser in the DS mode (HF Limit OFF), the threshold can be set to tame harsh S's (sibilants) that result from an overly bright singer or from EQ'ing to make a vocal sound aggressive and clear. The DS threshold is not level dependant, and compares the amount of high-frequency content to the low-frequency content, so adjusting the overall level does not affect the threshold. It features VCA technology for glitch-free, distortion-free, and noise-free performance. The corner frequency is user adjustable with a high-performance active crossover.

In HF Limit mode, the DerrEsser essentially acts as a high-frequency compressor. If there is enough high-frequency content to exceed the threshold, then gain reduction occurs. It is level sensitive, but responds much more to high frequencies. This mode is more of a general high-frequency smoothing device. In high-pass mode and while using the LISTEN function, the user can employ the filter circuitry inside the DerrEsser to process their audio. With the LISTEN button in, and the HP/LP switch out, the user will be hearing the high frequencies that are being controlled with the dynamic/compression circuits. The corner frequency is adjustable with the frequency knob. In low-pass mode and with the LISTEN button in, and the HP/LP button in, the user is now listening to the low frequencies, those not affected by the VCA and dynamic/compression circuits. This is a 12 dB-per-octave filter whose corner frequency can again be adjusted with the frequency knob.

  • High-frequency limiting with a tailored soft knee. The Dynamic Section can be used for de-essing or smooth high-frequency softening
  • Hard-Clip Indicator Light: This Bad-Clip LED indicates when the sound level is within 1 dB of hard clipping and monitors several sections within the DerrEsser for possible clipping
  • Unity Gain: 6 dB of gain on inputs and outputs available
  • API-500 Series rack compatible
  • True bypass
  • Military-grade switches and relays

UPC: 854682006085
In the Box
EMPIRICAL LABS DerrEsser ELDS-H 500-Series Dynamic High-Frequency Fixer (Horizontal Version)
  • Limited 3-Year Warranty
Frequency Response 3 Hz to 120 kHz (-3 dB points)
Dynamic Range -115 dB from maximum output (0.5% THD soft clipping) to minimum output, noise floor typically -93 dBu
Distortion Range 0.0035 and .01%
Outputs DC coupled
Input Impedance 20 kohms
Output Impedance 51 ohms
Attack Time < 1 ms
Release Time 0.04 seconds, fixed internally
Power Consumption Typical: 4 W
Maximum: 8 W
All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
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]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 10056754319

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Jason S.
Alexandria, US
★★★★★ 4
Not indestructible, but dogs love it
Color: Green
My dog LOVES this toy. Unfortunately, she loves it so much she destroys it. I have now purchased FOUR of these, but if left unattended for 5 minutes, my American terrier breaks this apart. She loves it so much though, I keep buying replacements. This is a wonderful enrichment toy, but you must keep an eye on your toothy friend.
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Reviewed in the United States on December 29, 2025
S
Verified Purchase
Simm in Seattle
Lowell, US
★★★★★ 3
Engaging and Fun, But Lacks Durability for Strong-Gripped Dogs
Color: Green
The internal mechanism of this toy works very well, and the ball’s movement immediately caught the attention of my Boxer pup. He was absolutely fascinated and spent hours each day playing with it. However, while the toy’s design is engaging, the durability of the exterior leaves much to be desired—especially for dogs who tend to pick things up with a firm grip. We didn’t know what to expect since our pup hadn’t previously played with an interactive ball, so we supervised playtime and made sure to store the ball in a safe spot when we couldn’t keep an eye on him. Despite this, the ball didn’t hold up. Our pup wasn’t intentionally chewing it. He simply carried the ball in his mouth when we moved downstairs or to another room, yet the grip while he carried the ball caused significant damage to the exterior. Within about a week of regular use (approximately 40 hours in total), the ball’s outer layer became deeply gouged by his teeth. To clarify, my pup wasn’t biting down hard or trying to destroy it, but his natural grip while carrying the ball left deep grooves in the surface. In just days, these gouges made the exterior sharp to the touch and compromised the structure. By the end of the week, we couldn’t screw the cover back together after removing it to recharge the ball, which made it unusable. And I was dismayed that there aren’t replacements readily available. Overall, my pup absolutely loved this toy — it was engaging and kept him entertained for hours. However, if your dog has a strong grip or frequently carries toys in their mouth, this may not hold up as well as expected. It’s a great concept but needs a more durable outer layer and replacement hard covers to make it a long-term investment.
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Reviewed in the United States on January 3, 2025
L
Verified Purchase
Larry Z.
Lexington, US
★★★★★ 5
My dog loves this ball
Color: Green
The battery on this lasts forever. The random on/off motion and when it gets touched inducing motion just keeps my dog guessing and occupied for a long time. My dog's tail is wagging the whole time.
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Reviewed in the United States on May 5, 2026
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DM
Whiting, US
★★★★★ 5
Great ball
I have bought two of these in different colors. My Yorkie loves them. They’re very interactive even if you don’t put the cover on it they move and if he’s not playing with it, it tends to go into sleep mode.My Yorkie got the cover off the ball within the first two minutes. But he loves the ball. Now bought 2nd ball. The ones with covers don’t work he rips the covers off.
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Reviewed in the United States on October 15, 2025
L
Verified Purchase
Lindsey Newhouse
Dallas, US
★★★★★ 5
Super Fun
Color: Green
One of the most entertaining things you could buy. The dogs go crazy over it and have so much fun. It's a bit loud on hard floors, but honestly worth it for the laughs. Seems pretty durable too. I have 2 labs; one started out uninterested and the other started off scared of it, but not too long after, they both started going crazy, tossing and carrying it around while it shook.
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Reviewed in the United States on March 21, 2026

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