HE18
BUZZ OFF
Rolls Corporation
10/11
HE18 Buzz O
The HE18 helps remove hum and buzz from a
balanced or unbalanced line. Perfect for musi-
cians or audio professionals, the unit is safe
and convenient to operate. Simply connect
the o ending 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
INTRODUCTION
Thank you for your purchase of the HE18 Buzz O . 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
1 Stereo 3.5mm / Tip-Left Ring-Right
OUTPUT(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, 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 ampli er 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.
CONNECTING A SPEAKER LEVEL SIGNAL (ie. THE
OUTPUT OF A POWER AMPLIFIER) WILL CAUSE PER-
MANENT DAMAGE TO THE HE18.
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”
1
Rolls Corporation
5968 So 350 West
Murray Utah 84107
1
HE18.SCH A
14 Oct 2011
Document Number:
Date:
Rev:
Sheet of
HE18b BUZZ OFF
Ba
OUTPUTS
INPUTS
J3
PHONE 1/4
J4
PHONE 1/4
TR1
XFMR AUDIO
TR2
XFMR AUDIO
J1
PHONE 1/4
J2
PHONE 1/4
5
6
4
J5B
RCAX4 PC
2
3
1
J5A
RCAX4 PC
J6
3.5STJK
SCHEMATIC
(4 pages)
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