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Rolls HE18 Two-Channel Audio Hum and Buzz Remover

BH #ROHE18 • MFR #HE18 BUZZ OFF
38 reviews
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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
Input / Output Connectors
2 x 1/4" TRS Inputs (Balanced/Unbalanced)
2 x RCA (L/R) Inputs
1 x 1/8" / 3.5 mm TRS Input

2 x 1/4" TRS Outputs (Balanced/Unbalanced)
2 x RCA (L/R) Outputs
Frequency Response (-0.5 dB)
20 Hz to 70 kHz
Distortion
< 0.005% THD @ 1 kHz
Crosstalk
> -97 dB
Input Impedance
1 kilohms (Max)
Minimum Load Impedance
10 Kilohms
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

Great unit, solved computer video buzz problem

By Arthur
Rated 5 out of 5
Date: 2026-01-29

The Buzz Off solved a problem I was having with computer video noise getting into the output of a digital to analog converter fed from that computer via USB. Somehow the noise was getting into the audio ground via the USB connection. Connecting the Buzz Off in between the analog audio outputs of the DAC and the inputs of the amplifier feeding my speakers completely eliminated that noise. The Buzz off is very well made and I was really impressed with its "tank like" construction. Besides eliminating my noise problem it has no audible effect that I can discern on the audio quality. I ran some test tones through the unit, and its frequency response is very flat other than it being down about 1/2 dB at 20 Hz and about 1/4 dB at 20 KHz. This is a high quality unit that performs very well despite costing maybe 1/2 of what other, similar devices are selling for. Plus it gives you balanced 1/4" TRS inputs as well as 3.5mm TRS along with the RCA plug ins and outs, which some of those other units do not. I highly recommend the Buzz Off if you have a similar grounding/noise problem.

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.

See any errors on this page?

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 M
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 S
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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