Rolls HE18 用户手册

HE18 

 

BUZZ OFF

Rolls Corporation

 1/05

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t fo

r m

us

i-

cians 

or 

audio 

professionals, 

the 
unit 

is 

safe 

and 

convenient 

to 
operate. 

Simply 

connect 

the 
offending 

line 

into 

the 
input, 

and 

connect 

the output to your next device.

- Helps eliminate ground hum and buzz

- Dual channel

- 

No power required - completely passive

- Converts balanced to unbalanced 

 

   lines and vice versa

Thank you for your purchase of the HE18 Buzz Off. If you’ve got 

hum or buzz in your audio signal, the HE18 is the solution you 

need. Almost all AC hum is caused by ground loops. These ground 

loops act like radio antennae, picking up hum and noise. The HE18 
removes many causes of noise by eliminating the ground potential.

1. Unpack and Inspect the HE18 package

Your HE18 was carefully packed at the factory in a protective 

carton. Nonetheless, be sure to examine the unit and the carton 

for any signs of damage that may have occurred during shipping. If 

obvious physical damage is noticed, contact the carrier immediately 

to make a damage claim. We suggest saving the shipping carton 
and packing materials for safely transporting the unit in the future

.

For information on the Rolls One Year Limited Warranty, and 

to register this product, visit our website at www.rolls.com

INPUT(S):  

2 ea; 1/4” Tip-Ring-Sleeve jacks

 

 

2 ea; RCA jacks

OUTPUT(S):   2 ea; 1/4” Tip-Ring-Sleeve jacks

 

 

2 ea; RCA jacks

To insert the HE18 in a system with a buzz or hum, discon-

nect the device you suspect is causing the noise. Connect 

that device’s Output to either of the Inputs (1/4” or RCA), and 

connect the HE18 Output(s) to the next device in the signal 

chain.

For example; if you’ve got a buzz in your video system, con-

nect the HE18 between the video unit and amplifier to isolate 

the signals.

PLEASE NOTE: THE HE18 IS INTENDED TO RECEIVE 

LINE LEVEL (0db to +4 dB) SIGNALS. DO NOT CONNECT 

A MICROPHONE LEVEL SIGNAL OR A SPEAKER (POW-

ERED) LEVEL SIGNAL TO THIS UNIT.

Max Out: 

 

Bal: +18 dB

 

 

 

Unbal: +12 dB

Max In:  

 

Bal: +22 dB

 

 

 

Unbal: +22 dB

Input Impedance:  

RCA: 10 k Ohm

 

 

 

1/4”: 10 k Ohm balanced

Output Impedance: 

RCA: 10 k Ohm 

 

 

 

1/4”: 10 k Ohm balanced

THD:   

 

.05% @ 1 kHz

Weight:  

 

1 lbs. (.45 Kg)

Size:   

 

4.15” x 2.46” x 1.55”