Rolls HE18 User Manual
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
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 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 (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
INPUTS
PHONE 1/4
J3
RCAX4 PC
J5B
6
PHONE 1/4
J4
5
4
TR2
XFMR AUDIO
TR1
PHONE 1/4
J5A
RCAX4 PC
2
1
PHONE 1/4
J1
OUTPUTS
3
J2
Rolls Corporation
10/11
lines and vice versa
- Dual channel
-
- Converts balanced to unbalanced
No power required - completely passive
BUZZ OFF
HE18
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
HE18 Buzz O
3.5STJK
J6
XFMR AUDIO
Document Number:
Ba
Date:
14 Oct 2011
Rolls Corporation
5968 So 350 West
Murray Utah 84107
HE18b BUZZ OFF
HE18.SCH A
Sheet of
1
Rev:
1
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