Rolls HE18 User Manual

INPUT OUTPUT

BUZZ OFF

INPUT OUTPUT

MADE IN THE USA

RIGHT

LEFT

R

R

L

L

INPUT

OUTPUT

RIGHT

INPUT

LEFT

INPUT

RIGHT

OUTPUT

LEFT

OUTPUT

BUZZ

OFF

MADE IN THE USA

Removes buzz or hum

caused by ground loops

Requires no power

Converts unbalanced

signals to balanced

HE18

INTRODUCTION

INPUT OUTPUT

BUZZ OFF

INPUT OUTPUT

MADE IN THE USA

RIGHT

LEFT

R

R

L

L

INPUT

OUTPUT

RIGHT
INPUT

LEFT

INPUT

RIGHT

OUTPUT

LEFT

OUTPUT

BUZZ
OFF

MADE IN THE USA

Removes buzz or hum
caused by ground loops
Requires no power
Converts unbalanced
signals to balanced

HE18

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.

INSPECTION

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.

WARRANTY

For information on the Rolls One Year Limited Warranty, and
to register this product, visit our website at www.rolls.com

DESCRIPTION

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

OPERATION

To insert the HE18 in a system with a buzz or hum, discon­nect 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, con­nect 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 (POW­ERED) LEVEL SIGNAL TO THIS UNIT.

CONNECTING A SPEAKER LEVEL SIGNAL (ie. THE
OUTPUT OF A POWER AMPLIFIER) WILL CAUSE PER­MANENT DAMAGE TO THE HE18.

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

DIAGRAM

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”

SCHEMATIC

Rolls Corporation

1/05

BUZZ OFF

HE18

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

-

- Converts balanced to unbalanced

lines and vice versa

No power required - completely passive

The HE18 helps remove hum and buzz from a

balanced or unbalanced line. Perfect for musi

HE18 Buzz Off

-