using the hum eliminator™ hum eliminator - … · hum eliminator™ applications ... related hum...
TRANSCRIPT
Hum
Elim
inato
r™ A
pplic
atio
ns
Hum
Elim
inato
r™ G
enera
l Instru
ctio
ns
The H
um
Elim
inato
r™ does m
ore
th
an ju
st
pre
vent
AC
hum
fro
m bein
g pic
ked up by your
sound
syste
ms. It a
lso c
an b
e u
sed a
s o
ne o
f the m
ost c
ost-e
ffectiv
e w
ays to
convert u
nbala
nced s
ignals
to tru
e
bala
nced s
ignals
.
GRO
UN
D L
OO
PS - T
he H
um
Elim
inato
r™ p
revents
gro
und lo
op a
nte
nnae fro
m fo
rmin
g a
nd p
ickin
g u
p A
C
hum
. AC
hum
& n
ois
e is
alm
ost a
lways c
aused b
y a
loop a
nte
nna e
ffect a
cro
ss s
ignal lin
es b
etw
een tw
o
or m
ore
pie
ces o
f gear, o
r by lo
ng u
nbala
nced c
able
s pic
kin
g u
p n
oise
. Loop a
nte
nna(e
) are
basic
ally
a ty
pe
of ra
dio
ante
nna, w
hic
h te
nd to
pic
k u
p th
e 6
0H
z and h
arm
onic
s (5
0H
z in o
ther p
arts
of th
e w
orld
) AC
sig
nal b
ein
g b
roadcast b
y a
build
ing's
ele
ctric
al c
urre
nt. T
hese lo
op a
nte
nnae a
re c
losed c
ircuits
usually
alo
ng th
e g
round w
ires a
nd h
ence a
re c
om
monly
calle
d g
round lo
ops.
BA
LA
NC
ED
/ UN
BA
LA
NC
ED
- Unbala
nced sig
nals a
re m
ore
susc
eptib
le to
pic
kin
g u
p e
lectric
al n
oise
& R
F
inte
rfere
nce th
an bala
nced sig
nals
are
. The lo
nger
the unbala
nced cable
, th
e gre
ate
r th
e chance of
a
pro
ble
m. T
he H
um
Elim
inato
r™ is
one o
f the m
ost c
ost-e
ffectiv
e w
ays to
convert b
etw
een u
nbala
nced
sig
nals
and tru
e b
ala
nced s
ignals
.
MIX
ERS/R
EC
ORD
ING
- Many m
ixers
have e
ither u
nbala
nced o
r "im
pedance b
ala
nced" m
onito
r outs /
aux se
nds. U
se a
Hum
Elim
inato
r™ to
get tru
e b
ala
nced m
onito
r outs fo
r noise
-free p
erfo
rmance. W
hen u
sin
g
more
than o
ne m
ixer (o
r subm
ixin
g), th
ere
's a
huge c
hance o
f gettin
g g
round lo
ops (a
nd th
at b
uzz!). U
se
Hum
Elim
inato
rs™ to
pre
vent th
ese
gro
und lo
ops. E
limin
atin
g h
um
is one o
f the b
iggest c
halle
nges fa
cin
g
stu
dio
s. M
any s
tudio
s w
ill run a
ll of th
eir lin
e le
vel g
ear th
rough H
um
Elim
inato
rs™ to
help
ensure
nois
e-
free re
cord
ing.
KEYBO
ARD
S / S
AM
PLERS / S
YN
TH
S · M
ost k
eyboard
s, sam
ple
rs, and sy
nth
esize
rs have u
nbala
nced -1
0dBV
outp
uts. U
se a
Hum
Elim
inato
r™ to
bala
nce th
e sig
nals if u
sing w
ith o
ther -1
0dBV
equip
ment. T
o u
se a
-10dBV
unbala
nced d
evic
e w
ith a
+4dBu b
ala
nced d
evic
e, u
se a
n E
BTEC
H® L
ine L
evel S
hifte
r™.
LIV
E S
OU
ND
/ DJ M
IXERS - A
com
mon p
roble
m w
ith liv
e p
erfo
rmance is
long u
nbala
nced c
able
s p
ickin
g
up hum
alo
ng th
e w
ay.
Bala
nced sig
nals
are
m
ore
im
mune to
pic
kin
g up nois
e.
Use th
e H
um
Elim
inato
r™ to
bala
nce lo
ng unbala
nced sig
nals.
Mobile
D
Js
or
bands
never
know
w
hen se
tting u
p th
eir
syste
m if th
ey're
goin
g to
get a
hum
or n
ot. T
he e
lectric
al w
iring c
hanges fro
m o
ne b
uild
ing to
anoth
er.
What
work
s fin
e at
one gig
m
ight
not
work
at
the next.
It's w
orth
th
e lo
w cost
to keep a H
um
Elim
inato
r™ a
vaila
ble
, nobody c
an a
fford
to lo
se a
gig
because
of h
um
pro
ble
ms. S
om
e D
Js ru
n e
very
thin
g
in th
eir
rig th
rough H
um
Elim
inato
rs to
pla
y it
safe
. The m
ain
outs
on m
ost
DJ m
ixers
are
-1
0dBV
unbala
nced R
CA
. When u
sin
g w
ith a
+4dBu p
ow
er a
mp, o
ver 2
/3rd
's o
f the a
mp's
volu
me c
an b
e lo
st.
Use a
n E
BTEC
H® L
ine L
evel S
hifte
r™.
PO
WER A
MPLIF
IERS - R
unnin
g m
ultip
le a
mplifie
rs c
an c
reate
gro
und lo
ops b
etw
een th
e a
mplifie
rs, w
hic
h
will p
ick u
p th
e d
readed h
um
and b
uzz. R
un e
ach a
mplifie
r's in
put lin
e th
rough a
Hum
Elim
inato
r™ to
pre
vent th
is p
roble
m.
GU
ITA
R O
R BA
SS -
Whenever
possib
le,
we re
com
mend you use our
Hum
X
pro
duct
for
GRO
UN
D
RELA
TED
hum
issues o
n a
guita
r or b
ass rig
setu
p. If y
our a
re in
apart o
f the w
orld
where
the H
um
X
cannot b
e u
sed, th
e H
um
Elim
inato
r is th
e n
ext b
est s
olu
tion. If a
ny o
f your F
X p
edals
have a
3 p
rong
gro
und p
ow
er p
lug, y
ou w
ill need to
put th
e H
um
Elim
inato
r on th
e a
udio
feed to
the a
mp. W
hen u
sing
two o
r more
guita
r am
plifie
rs (with
stere
o F
X o
r ABY sp
litters), g
round lo
ops c
an fo
rm b
etw
een th
e a
mplifie
rs. Bass a
mps c
an g
et g
round lo
op fro
m th
e D
I connectio
n to
the P
A; sim
ply
run th
at D
I feed th
rough th
e H
um
Elim
inato
r.
CO
MPU
TER S
OU
ND
CA
RD
S - M
ost so
und c
ard
s have u
nbala
nced in
puts a
nd o
utp
uts. B
ala
nce th
ese
with
the
Hum
Elim
inato
r™. E
ven b
ala
nced so
und c
ard
s have tre
mendous su
sceptib
ility to
gro
und lo
ops b
ecause o
f the
com
pute
r's p
ow
er s
upply
. If you h
ear a
buzz, u
se a
Hum
Elim
inato
r™.
BRO
AD
CA
STIN
G / V
IDEO
- Pre
ss Boxes h
ave m
any fe
eds a
ll goin
g to
diffe
rent g
ear; w
hic
h c
an c
reate
lots o
f gro
und lo
ops
and hum
. U
se a H
um
Elim
inato
r™ on th
ese
fe
eds
to elim
inate
th
e pro
ble
m.
Usin
g a H
um
Elim
inato
r™ o
n th
e a
udio
feed o
f a v
ideo c
am
era
can h
elp
pre
vent v
ideo h
um
(snow
).
Rev. J
un 1
9, 2
012
WH
AT W
ILL T
HE H
UM
ELIM
INA
TO
R™
SO
LV
E?
The H
um
Elim
inato
r™ is
a unity
gain
sig
nal
and gro
und path
is
ola
tor
desig
ned to
bre
ak g
round lo
ops. H
um
and n
ois
e c
aused b
y th
e p
resence o
f a g
round lo
op c
an b
e
sto
pped b
y in
sertin
g th
e H
um
Elim
inato
r™ in
the lin
e le
vel s
ignal p
ath
(+4dBu o
r -10dBV
). This
elim
inate
s th
e g
round lo
op w
ithout d
egra
din
g y
our s
ignal. T
he H
um
Elim
inato
r™
will n
ot re
duce h
um
or n
ois
e n
orm
ally
genera
ted b
y a
pie
ce o
f equip
ment. In
oth
er
word
s, fo
r nois
y p
ream
ps, n
ois
y s
ingle
coil p
ickups o
r nois
e c
aused b
y fa
ulty
tubes,
oth
er c
orre
ctiv
e a
ctio
n w
ould
apply
.
USIN
G T
HE H
UM
ELIM
INA
TO
R™
Identify
the g
round lo
op c
ausin
g th
e tro
uble
; not a
ll gro
und lo
ops c
ause n
ois
e o
r hum
. For c
om
ple
x s
yste
ms y
ou m
ay n
eed to
repeat th
ese s
teps s
tartin
g w
ith a
diffe
rent
pie
ce o
f equip
ment in
vario
us c
om
bin
atio
ns to
locate
the p
roble
m:
1)
Strip
th
e syste
m dow
n to
one pie
ce,
such as th
e m
ixer,
by dis
connectin
g all
inte
rconnects
and A
C c
ord
s e
xcept fo
r the m
ixer.
2)
Add one pie
ce of
equip
ment
at
a tim
e;
hook up A
C and in
terc
onnects
(m
akin
g
sure
all g
rounds a
re c
onnecte
d a
nd in
good c
onditio
n) th
en lis
ten fo
r hum
or n
ois
e.
3) T
urn
on a
nd o
ff the p
ow
er e
ach tim
e y
ou s
witc
h e
quip
ment to
avoid
pops/s
horte
d
outp
uts
.4) P
roceed u
ntil y
ou fin
d th
e o
ffendin
g p
iece(s
) causin
g th
e p
roble
m.
5)
Plu
g th
e H
um
Elim
inato
r™ in
all
lines betw
een th
e offe
ndin
g equip
ment
and th
e
rest o
f the s
yste
m. F
or e
xam
ple
, insert th
e lin
e o
uts
of th
e k
eyboard
into
the in
puts
of th
e H
um
Elim
inato
r™, th
en in
sert th
e lin
e o
uts
of th
e H
um
Elim
inato
r™ in
to th
e in
puts
of th
e m
ixer.
IMPO
RTA
NT:
Never
use th
e H
um
Elim
inato
r™ betw
een an am
plifie
r and speaker
or
the equip
ment
may becom
e dam
aged.
Use only
on non-p
ow
ere
d lin
e le
vel
sig
nals
.
With
a ra
ck o
f am
plifie
rs, w
e re
com
mend p
uttin
g a
n 8
channel s
ingle
rack s
pace
Hum
Elim
inato
r™ in
front o
f your a
mps' in
puts
so y
ou d
o n
ot h
ave to
solv
e g
round lo
op
pro
ble
ms d
urin
g s
ound c
hecks.
A com
mon path
fo
r gro
und lo
ops is
th
rough a chassis
in
to th
e ra
ck and th
en in
to
anoth
er
chassis
. Test
this
by re
movin
g th
e chassis
fro
m th
e ra
ck.
The H
um
Elim
inato
r™ w
ill help
but y
ou s
hould
als
o try
isola
ting th
e c
hassis
from
the ra
ck w
ith
ele
ctric
al ta
pe a
nd in
sula
ting th
e ra
ck s
cre
ws w
ith n
ylo
n w
ashers
.
Most
gro
und lo
op pro
ble
ms can be solv
ed usin
g th
e H
um
Elim
inato
r™.
Patie
nce is
a
necessity
w
hen atte
mptin
g to
solv
e gro
und lo
ops!
Many popula
r m
ixers
w
ith TRS
bala
nced lin
e in
puts
do not
have com
mon m
ode re
jectio
n.
They dro
p th
e in
verte
d
sig
nal,
cre
atin
g unbala
nced in
puts
! To get
the benefits
of
bala
nced in
puts
, ru
n your
bala
nced lin
e in
to th
e H
um
Elim
inato
r™ a
nd ru
n a
mono 1
/4" lin
e fro
m th
e H
um
Elim
inato
r outp
uts
to th
e m
ixer's
TRS in
puts
. This
way y
ou are
ru
nnin
g a bala
nced lin
e all
the
way u
p to
the H
um
Elim
inato
r™ a
nd y
ou w
ill not lo
se c
om
mon m
ode re
jectio
n.