THE GOLDMUND
GOLDCUBE
Swiss
Made
ATTENTION
No
connection or
manipulation must
be done before
reading
those instructions. Damage
to
the amplifier may result if the
following instructions
are
not
consciously understood and
applied.
UNPACKING
You will find in the GOLDMUND GOLD CUBE
packing
:
-
A
pair
of the amplifiers,
-
This manual,
-
Accessories
and spare fuses.
Please keep
the
packaging
in
case
you
need
to transport the
amplifiers at a
later
date or if
you
have to send them for mainte-
nance.
CHOICE
OF
AMPLIFIER LOCATION AND
COOLING
The
GOLDMUND GOLD CUBE has been designed to be used
in
combination
with
the GoLDMUND APOLOGUE speaker sys-
tem,
in
the special lodging of its back
panel.
In this case, the
amplifier is
automatically
reaching its
proper
temperature of
f unction for
optimized
performances.
lf
used in a different
configuration, do
not forget
that the GOLD
CUBE, as all the
high
quality
amplifiers.
generates
a
large
amount
of heat.
It is mandatory
to allow a
proper
cooling of the body of the GO LD
CUBE which acts
as
heat
sink.
Avoid
a
location which is not
properly
vented.
LINE VO LTAGE ADJUSTMENT
The
GOLDMUND GOLD CUBE amplifier
is internally wired for
a
specif
ic line
voltage.
ATTENTION
: A 234V adjusted amplifier
will function
properly
f
or AC
line
voltage between 2OOV and
245Y . For
a
1 1 7V version,
the
AC line must deliver between
105
and
125V. lf
your
AC line is
usually
out of
these
tolerances,
please
consult
your
GOLDMUND
dealer.
Please
check the
value
of the
main line f
use.
This f use
is located
on
the bottom of the amolifier,
near
a corner.
The
golden
lid
can be
removed with
a smallscrewdriver
or better
with
a coin, and then the
f
use
holder.
Use a 3A slow-blow
fuse for 22OV
and a 5A slow-blow
fuse for
1 10V.
4.
CONNECTIONS
Connectthe
power
cord of the amplifier
in
the
nearest wall
plug.
Use only a 3
lugs
grounded
plug,
for
safety
reasons. To
get
the
best sound
of the amplif
ier,
avoid any
multiple
plug
or
extension
cord.
Connect the
interconnect
between the
preamp
and the
power
amp.
The
RCA
female
socket
is
the highest
quality
WBT socket
(ground
connectsfirst and the
plug
may be locked if
you
use the
GOLDMUND-M lT interconnect).
lf
the GOLD CUBE
is
used
with
an
APOLOGUE,
use the
provided
bi-male
iunctions
to
plug
it inside
the special
lodging in
the
speaker
back.
The
proper position
of the cube
is when
the
power
cord and the
power
switch are
visible
on
the
bottom angle of
the
cube
from
the outside.
Otherwise,
connectthe speaker cables tothe two banana
recep-
tacle
located
on the opposite face from
the
input. The
"
+
"
is
marked with
a
red
dot.
The
amplifier
is
non-inverting in
phase.
-2-
5.1
AMPLIFIERS
CONTROLS
On the
front
plate
of the GOLDMUND GOLD CUBE are only
accessible:
The
power
key, used
to
power
the amp on.
When
activated. the speaker is
connected after a
very
short
delay and the
red
LED switches
on.
The
amp
is
powered
off by
switching
off the
power
key.
The red led will fade very slowly,
indicating
discharge of the
filtering
capacitors and the speaker
will
be disconnected after few
seconds.
5
.2 The
two rail fuse sockets.
Each
rail fuse holder is
protected
by a
golden
lid. which
can be
removed
using a coin. A red
point
LED, located near
the
fuse
indicate
that the
fuse is
burned
when it
glows.
SOUND
OUALITY OPTIM
IZATION
6
.1 Warm-up
sonic effect.
lf
the
power
amplifier has not been
powered
off
for
a
few
days,
theoptimum sound
quality
is
only
reached
after 3Ominutes.
This
delay
has
been optimized
to be
minimal
and the sonic
quality
when
lust
powered
on
is much higher
than other
quality power
amplif iers.
6 .2
Speaker
polarity.
Even if
you
have
a
phase
inverter
on
your
preamplif
ier
(as
on the
GOLDMUND MIMESIS
2 or MIMESIS 7).
and even
if
you
have
carefully
selected the
proper
line
phase
(see
in next
paragraph),
there is
a
possibility
to again increase
the sonic
quality
of
your
speakers
by
reverting
the
polarity
of the speaker cable amp
termination. But
since the
line
phase
and the speaker
polarity
interfere
to each other,
you
have
to experiment
carefully all the
combinations
before
picking
the right one.
lf
your
preamp
has
an absolute
phase
inverter,
this
will
interfere
too. lf it has not,
don'tforgetthe result willdepend
of the source.
most of
the
record
and
CD being
recorded without
care for the
absolute
phase.
Be
patient..
-3-
6.3
Main line
ohase
inversion.
The
sonic
quality
of
your
GOLD
CUBE
may
be
slightly
improved
if
the
main AC line is
properly
connected.
Try
to
invert the
plug
of
your
amplifier, using
a special adapter.
We recommend
that
you proceed
caref ully to try
this.
You must
do
it in
combination
with the speaker
polarity
and/or
with
abso-
lute
phase
switching to be sure of the
result.
7.1
SAFETY FEATURES
The
GOLDMUND GOLD CUBE amplifier
provides
very sophisti-
cated
features
to
protectthe
amplifierandthe
speaker
against all
kind of mishandle or comoonent
failure.
Protection
against
DC.
The GOLD CUBE is a DC-coupled amplifier.
lf
the associated
preamplifier
is
badly
designed or defective
(often
true
for
the
tube
preamps),
the speaker could be damaged.
The
detection
circuit of the GOLD
CUBE
is
totally
immune
to
any sonic effect
but
will immediately
switch off the
speaker
if
such a
malf unction
occurs.
The speaker will be immediately and automatically
reconnected
as soon as the
perturbation
disappears.
Protection
against
HF
oscillations.
In the same way, the speaker
will
be disconnected
if
a
large
amount
of
high frequency oscillation
is
present
and shows a
danger
forthe
tweeters, even
if these
frequencies remain
unno-
ticed.
The
amplifier
returns
to
normal if
the
oscillation disappears.
Protection
against short-circuits.
lf one output is short-circuited by accident and
the current
becomes too
high,
one of the
rail fuse
may
blow.
In
this case, the small
LED located at the top ofthe defective
fuse
lid will
glow.
To replace
the defective
fuse,
switch the amplifier
off for
1O
minutes f irst. Then
open the top
f use cover
with
a coin or a
large
screwdriver. The f
use
loader is then accessible under the
golden
cover and
must
be removed by turning
it
off
with
a screwdriver.
7.2
t.5
-4-
You must
use a 5
Amps fast f
use
(or
6.3
Amps if
you
use very low
efficiency
speakers) or 8
Amps
ultra-fast.
Then
put
the cover back in
position
and switch the
power
on
if
the short-circuit
has
been detected and
removed.
To
avoid the f uses to blow, avoid to short-circuit the outDut
terminals accidentally.
There is
no risk to leave the soeaker terminals unconnected
when
the amo is on,
8.
MAINTENANCE
The
GOLDMUND GOLD CUBE
is
gold plated
with
a
1O microns
18kt
gold
layer,
using the best
ieweler
technology.
lt
should
never
alter externally, except if mishandled.
To
clean the amplifier, use
a
very
soft
cloth to avoid
scratching
the
gold
surface.
Otherwise
the GOLDMUND GOLD CUBE amplifier
requires no
maintenance. For
the audio
purist
who wants to
keep his
amp
sounding
as
new. we
only
recommend
that after a
year
or two,
you
have a technician
or an official GOLDMUND
representative
readjustthe
DC
offset.
Thisvery
simple operation takes onlytwo
minutes
and will
give
you
the safety of
long
years
of unmatched
sound
quality.
IMPORTANT
NOTICE :
The
Goldcube should never be left
powered
on,
without input
cable
connection to a
preamplifier.
lf warmed up without
con-
nection.
please
insert
short-circuit
plugs
delivered
with
the cube
to avoid
any
RF
oscillation.
-5-
TECHNICAL
DATA
POWER
-
Nominalpower
: loowRMS(2-8Ohmsl.
60 W RMS
l1
-
16
Ohmsl.
-
Msximum
power
: l50WRMS13Ohms).
-
Maximumvoltag6:
35Vpeak.
-
Maximum
cu,,cnt: 20
A
Doak.
FREOUENCY
RESPONSE
Th6sa figuros
are
valil for
any
levet
between 0and
nominal
power.
-
+/-
O.l d8. O. IOO kHz.
-
+/.
I dB,0
-
40O kHz.
-
+/.3d8,0
-
0.9
MHz.
INPUT
SENSITIVITY
-
Nominallevel
: 1.55 V
(+6dBl.
-
Inout im9odanca
:
50
kohms.
GROUP O€LAY
-
Propagarion
delay
< lOO ns
stablG
with tr6quency lrom
OC to 20O kHz.
DISTORTION
Figlre3 vElid
,or
8ll
lovels f.om
0 to 25 V
/ Iohns.
-
Dynamic
: TID<0.O1
%(.8OdBt.
.
Sbtic I
THD<0.O1
%G8OdBl.
SPEED
-
Slew.ate
: >
2oov/us
.
Riso
tim€ :
<
soons.
NOISE
-
w8ighted AsA A
:
>
l0o dB.
OPERATING TEMPERATURE
-
Room
l€mpsraturo :
-3O
to
+4O
dog,e6s Calsius
(-22
to
+
1O4
dsgr€ss
F8h'rnhoitl.
-
In$m€ltsmpeGtu.e
:
+45to
+
65 dogrees Colsius
{
+
1 l3
to
+
149dcgr€ca Fah.6nheit}.
POWER
SUPPLY
-
Nominsllins volt'gs
I
10O, 117,or23V.
-
Inp{t volt8ge ranga
:
+/-
10%.
-
Maximum
powga
co{Eumption : 250 W.
SAFETY
F€ATURES
-
DC
protsction
th.oshold :
5V.
-
HF
protefiioo
thr€shold :
3VRMSat50kHz.
-
Inprrr voltag€
fuso | 3Adow{lowfo.22OVlSAstow.btowfo.
llOV.
-
Shon.ci,cuit
o.otrction
: 2 fu36
5
A fasr,
SIZE ANO W€IGHT
-
12.7
cm
l5"l
wx
l2.7cm
(5'l
Dx 12.7
cm
{5"}
H.
-
Weighr
: 7 kG net.
-6-
/
