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Rolls HE18 Two-Channel Audio Hum and Buzz Remover

BH #ROHE18 • MFR #HE18 BUZZ OFF
 35 reviews
Rolls HE18 Two-Channel Audio Hum and Buzz Remover
Key Features
  • For Musicians and Audio Professionals
  • Helps Eliminate Ground Hum and Buzz
  • Dual Channel Operation
  • Inputs: 2 x 1/4" TRS, 2 x RCA, 3.5mm TRS
Perfect for musicians and audio professionals, the Rolls HE18 is a two-channel audio hum and buzz remover that virtually eliminates 60 Hz hum from a balanced or unbalanced line. The unit also converts unbalanced signals into balanced signals and vice versa, improving the overall noise performance of your audio system. Easy and convenient to use, the HE18 is completely passive and doesn't require power to operate.
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Rolls HE18 BUZZ OFF Overview

Perfect for musicians and audio professionals, the Rolls HE18 is a two-channel audio hum and buzz remover that virtually eliminates 60 Hz hum from a balanced or unbalanced line. The unit also converts unbalanced signals into balanced signals and vice versa, improving the overall noise performance of your audio system. Easy and convenient to use, the HE18 is completely passive and doesn't require power to operate.

At a Glance
Eliminates ground-loop hum and buzz
Leaves signal grounds connected
Passive unit, no power required
Converts balanced lines to unbalanced lines and vice versa
Adjusts signal voltages to match difference in ground potential
UPC: 675889000184

Rolls HE18 BUZZ OFF Specs

General
Compatibility
Not Specified by Manufacturer
Physical
Dimensions
4.15 x 2.46 x 1.55" / 10.54 x 6.25 x 3.94 cm
Weight
1 lb / 0.5 kg
Packaging Info
Package Weight
0.8 lb
Box Dimensions (LxWxH)
7.9 x 4.6 x 2"

Rolls HE18 BUZZ OFF Reviews

Reasonable Cost Performance Compromise

By Patrick
Rated 3 out of 5
Date: 2023-06-06

Tested it prior to installation, 60dB THD+N, Relatively flat frequency response but it had LF cutoff above 20Hz. It's not Jensen JT-11P transformer performance but it's also at a much lower cost than a pair of Jensen transformers.

Quality Product that Solved the Problem

By Kevin
Rated 5 out of 5
Date: 2022-02-13

It solved the 60hz hum in a finicky class A headphone amp that had a hum no matter the configuration. Now I have pleasant emptiness behind the music. My second Rolls purchase. Affordable well-built products from a US company is always a plus. Fast shipping from B&H.

Solved my ground loop

By Aaron
Rated 5 out of 5
Date: 2021-07-12

I had a bad ground loop hum when connecting an AV receivers unbalanced outputs to a mixer. This fixed it.

Eliminates hum as advertised!

By Tom
Rated 5 out of 5
Date: 2021-03-12

I had an awful ground loop hum to 2 different mixers and nothing I tried worked, until I found this little guy. Just plug your audio inline with it, and presto - hum eliminated!

Say goodbye to 60hz buzz - works perfectly!

By Jacob
Rated 5 out of 5
Date: 2020-12-10

I've always kept studio monitors in my editing bay and before Thunderbolt docks, I never had a problem with 60hz buzz. 3 iterations of Thunderbolt and 3 docks later, I've got all kinds of interference and ground loops, and having made a recent switch in desktop setups, a 60hz buzz with all kinds of tonal electronic whining reared its ugly head. It was so bad I had to eliminate my studio monitors from my desktop, which just isn't right. Toss in the HE18 and voila, it's all gone! For a passive unit, it's well built and even looks nice. Plus, it seems pretty tough so I wouldn't have any qualms about taking it into the field. Totally worth it!

Worked fine for me

By John
Rated 5 out of 5
Date: 2020-11-03

Needs no power to work. Is very flexible in i/o terms. No negative sonic effects detected so far (at first full week). My 60 Hz hum problem is gone!

BEWARE WHERE YOU PLACE THIS UNIT!!!!!

By David
Rated 1 out of 5
Date: 2023-02-01

I recently purchased 2 of these units to help eliminate ground loop noise within the signal cables going to the amps. After installation the ground noise was worst! Consquestly, it took us a week re-checking all signal cables trying to find a solution. After calling other sound engineers for advice, One engineer asked me if I installed the ROLLS HE18 into the system and I told him YES. Without hesitation, he told me he had the same problem on a job in lower Manhattan and after 3 weeks he found what the problem was. After removing the ROLLS from the rack shelf and letting it hang down without touching anything the HUM finally disappeared. We did this and the hum disappeared! My biggest proplem is WHY does'nt the manufacture state any of this in their installation instructions!! WHY IS THE UNIT NOT INSULATED WITH RUBBER or BARRIER TO PREVENT THIS FROM HAPPENING!!! THAT IS WHY A GAVE IT A 1 STAR!!

Works as stated

By Jim
Rated 5 out of 5
Date: 2022-02-21

I have a small sound system for my computer. I wanted to add a television to this system with a small 2 channel mixer. I got a loud grounding hum. I tried many things to get rid of this like making sure all the devices were plugged into the same AC outlet, making sure every unit was grounded correctly, etc. No success. I purchased this unit because of the different inputs and outputs so that it would be versatile for other applications if I wanted to use it for another purpose in the future. It works great. No hum and great audio quality. And it stereo.

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Will this take the left and right trs input and ...

Will this take the left and right trs input and convert it to rca left and right output?
Asked by: Joseph
Yes
Answered by: Raul M
Date published: 2021-10-01

question

Can this Rolls HE18 help reduces the hum noise for Audio Technica turntable with MC cartridge & Nakamichi control amp ?
Asked by: Anonymous
I have run into this problem in the past on multiple occasions. Check all wiring and cable connections inside the turntable (requires turntable disassembly in many cases to access internal connections) and clean all of those connections with a quality product for that purpose. This problem is usually caused by galvanization between dissimilar metals used on the mating connectors. Your best bet here is to have gold plating on both mating connector. Check and clean both cable ends as well.
Answered by: jim w.
Date published: 2018-08-27

Vendor/installer inserted a device (magna?) to ...

Vendor/installer inserted a device (magna?) to route all components into a graphic equalizer, then out to speakers. That worked, but it introduced a faint flutter into the output. Even when all components, including the tuner/amp are powered down, if the 'magna' has power to it the flutter remains. The Rolls is said to eliminate flutter, not hum. Is that true? Is there a better device to use with the equalizer, designed for flutter as wells as hum? or just flutter?
Asked by: Kenneth
The Rolls HE18 will only remove buzz and hum.
Answered by: David
Date published: 2022-01-27

Will it work for 120hz signals? I have a buzz ...

Will it work for 120hz signals? I have a buzz from my turntable and I have tried almost everything and I'm still getting a buzz
Asked by: Trevor
This style of buzz eliminator is designed for 50 to 60hz.
Answered by: Daniel
Date published: 2020-07-01

Is this good for car subwoofer hum?

Is this good for car subwoofer hum?
Asked by: Tim
If the cause of the hum is created by a ground loop, then the Rolls HE18 Buzz Off may help to resolve the problem.
Answered by: Lisa
Date published: 2022-01-03

question

can it be used for 50 Hz signals?
Asked by: Anonymous
The BUZZ OFF will block 50 Hz hum and the buzz produced by the line noise harmonics from AC Mains powered audio systems. Use short output cables from the HE15 the destination of the audio signal. This seems to help cut down the common mode noise on the long cable segment. This is a great box to have whenever connecting a laptop pc to a public address system to cut out unwanted noise. It works to eliminate noise that is sometimes present when presenters laptop is connected with video to projector and audio to amplifiers.
Answered by: SAMUEL M.
Date published: 2018-08-27
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