Crate QuadraDrive GT-80DSP User manual
iii
GT-80DSP
QuadraDrive
tm
Amplifier
with
Digital
Sound
Processing
OWNER'S
MANUAL
GT-80DSP
QuadraDrive
,m
Congratulations!
You
are
now
the
proud
ownnr
of
one
of
the
newest
and
most
innovative
guitar
amplifiers
available
Ihe
Crate
GT-80DSP
QuadraDrive^
m
with
Digital
Sound
Processing.
This
versatile
and
compact
am¬
plifier
features
four
separate,
footswitchable
Gain
controls,
with
your
choice
of
Tube
or
Solid
State
preamps
for
either
the
Rhythm
or
the
Lead
channel.
Discrete
tones
and
Master
Level
controls
for
each
channel,
along
with
Crate's
exclusive
Tube
Driven
Mosfet
power
amp,
add
even
more
flexibility
and
control
The
easy
to
operate
Digital
Sound
Processing
section
offers
you
a
wide
variety
of
effects,
from
some
of
the
finest
reverb
settings
to
the
truly
bizarre.
A
unique
feature
of
the
Digital
Sound
Processing
is
its
ability
to
"remember*
settings
for
each
preamp
and
channel
selection.
Like
all
Crate
products,
your
GT-80DSP
is
proudly
made
in
America,
using
only
the
best
compo¬
nents.
Extensive
testing
at
the
hands
(and
ears)
of
skilled
technicians
and
musicians
insures
you
that
this
amplifier
is
the
absolute
best
it
can
be.
In
order
to
get
the
most
out
cf
your
new
amplifier,
we
strongly
urge
you
to
go
over
the
information
contained
in
this
manual
before
you
begin
playing.
And
thank
y
ou
for
choosing
TABLE
OF
CONTENTS:
About
the
GT-60DSP:
3
The
GT-80DSP
Front
Panel:
4-6
Tho
GT-80DSP
Roar
Panel:
7
About
the
Digital
Sound
Processor:
Using
the
Mode
control:
8
Table
of
Settings:
9
Technical
Description:
10
Block
Diagrams:
11
Some
Suggested
Settings:
_12-13
System
Block
Diagram:
14
Technical
Specifications:
15
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NACHSCHX3F
Y
CRATE
GT-80DSP
QuadraD
rive'
ABOUT
THE
GT-80DSP:
The
Crate
GT-80DSP
QuadraDrive
*
with
Digital
Sound
Processing
is
truly
unique
and
versatile,
ottering
you
more
performance
and
flexibility
than
any
other
compact
amplifier.
Start
with
two
completely
separate
preamp
stages:
Solid
State
and
Tube
I
hen
add
the
two
chan¬
nels:
Rhythm
and
Lead
Put
them
together
and
you
have
your
choice
of
some
of
the
hottest
contem¬
porary
sounds
and
the
coolest
vintage
sounds
available.
For
example,
Solid
State
Rhythm
gives
you
‘today's
sourd:"
crisp
highs
and
an
ultra-tight
bass
response,
while
Tube
Rhythm
offers
you
that
vin¬
tage
tube
sound,
from
ultra-clean
to
a
bluesy
crunch.
Solid
State
Lead
gives
you
all
of
the
traditional
Crate
Mega-Gain
hard
rock
sizzle
and
fire,
v/ith
lots
of
definition
and
compression,
and
Tube
Lead
starts
with
a
bluesy
crunch
and
can
deliver
everything
up
to
screaming,
tube-driven
lead
distortion
with
plenty
of
sustain
and
total
tone
control.
But
that's
not
all.
Now
add
Crate’s
easy
to
operate
Digital
Sound
Processing,
with
31
preset
ef¬
fects
including
a
variety
of
delays,
backwards
sampling,
gated
outputs
and
reverbs.
Select
an
effect
for
each
of
the
four
preamp
and
channel
combinations
and
the
amplifier
will
‘remember”
each
setting
and
recall
it
as
you
switch
between
preamps
and
channels.
Add
a
tootswitch
and
you
can
preset
I
WO
set¬
tings
per
preamp/channel
cttoice,
for
up
to
8
instantly
accessible
effects.
And
the
GT-80DSP's
memory
is
"non-volatile'
which
means
that
orcc
you
enter
your
settings.
thoy'ro
in
tho
memory
until
you
change
them!
FEATU
R
ES
OVERVIEW:
Given
below
is
a
quick
overview
of
the
GTSODSP's
leatures
and
controls:
►
Two
Com
ple
tely
Separate
C
ha
nnels:
Independent
Gains.
3-band
EOs,
and
Levels.
►
Four
Ga
in
C
ontrols:
Tube
Lead,
Solid
State
Lead,
Tube
Rhythm,
Solid
State
Rhythm.
►
Di
gital
Sound
Proce
ssing:
A
wide
variety
of
digital
revorbs
and
effects.
The
ability
to
store
sottings
for
each
of
tho
four
channel/proamp
combinations
Footswitchable.
v/ith
9
settings
per
combinations.
►
Tube
Driven
Mo
sfet
P
ower
Ampl
ifier:
Crate
exclusive.
No
traditional
solid
state
output
devices
means
no
chance
of
harsh
“square
wave
-
distortion
►
Total
Foot
switc
h
Control:
Channel
and
Preamp
selection.
Digital
effects
control.
►
External
Speaker
Jack:
Series
connection
means
no
chance
of
overloading
the
amplifier.
Standard
1/4*
mono
phone
jack.
►
Ef
fects
L
oop:
1/4‘
Line
Out/Line
In
]acks.
Allows
external
signal
processor
connection.
Allows
direct
connection
to
external
amplifier,
mixer,
recording
console
or
whatever.
CR£3m£
GT-80DSP
QuadraDrive'"
The
GT-80DSP
Front
Panel:
1:
INPUT:
Connect
your
guitar
here
using
a
shielded
instrument
cable.
LEA
P
Q
aiflSi
2:
TUBE
GAIN:
This
serves
as
the
gain
control
lor
the
Lead
channel's
Tube
preamp
soctbn,
giving
you
control
over
the
compression
and
overdrive
characteristics
of
the
GT-80DSP‘s
input
tubes.
Use
this
control
along
with
the
Lead
Channel's
level
control
(#15)
to
create
a
wide
variety
of
sounds
at
any
volume
level.
(Some
suggested
settings
can
be
found
on
page
12.)
With
the
control
to
the
lull-left
position,
no
signal
passes
through.
As
you
bring
the
control
towards
center
you
increase
the
signal
level
ana
the
tube
compression,
wiili
maximum
tube
dis¬
tortion
towards
the
full-right
position.
3:
LEAD
LED:
This
LED
glows
red
when
the
Lead
Channel
is
chosen,
and
along
with
LED
#14
gives
you
a
visu¬
al
sign
that
the
Lead
Gains,
tone
section
and
Master
Level
are
active.
4:
SOLID
STATE
GAIN:
This
serves
as
the
gain
control
tor
the
Lead
channel's
Solid
Sate
preamp
sectbn.
Use
this
control
along
with
the
Lead
Channel's
level
control
(#15)
to
crcato
a
wide
variety
of
sounds
at
any
volume
lev¬
el
(Some
suggested
settings
can
be
found
on
page
13.)
With
the
control
to
the
full-left
position,
no
signal
passes
through.
As
you
bring
the
control
towards
center
you
increase
the
signal
level
and
compression,
reaching
maximum
distortion
in
the
full-right
position.
5:
CHANNEL:
Select
orther
the
Lead
channel
(switch
in
tho
IN
position)
or
the
Rhythm
channel
(switch
OUT)
with
this
pushbutton
switch.
The
channel
indicator
LEDs
(#3
and
14
for
lead.
#9
and
19
lor
rhylhm)
work
with
this
switch
as
a
visual
guide.
NOTE:
When
a
footswitch
is
connected
to
the
Channel
Select
footswitch
jack
(see
#29.
rear
panel)
the
front-
panel
switch
will
have
no
control
over
which
channel
is
selected.
6:
TUBE/SOLID
STATE:
Select
either
the
Tube
preamp
(switch
IN)
or
the
Solid
State
preamp
(switch
OUT)
for
either
channel
with
this
pushbutton
switch.
The
Tube
LED
(#7)
works
with
this
switch
as
a
visual
guide:
it
glows
when
the
tube
section
has
been
selected.
NOTE:
When
a
footswitch
is
connocted
to
the
Channel
Select
footswitch
jack
(which
also
serves
as
the
Tube/Solid
State
select:
see
#29.
rear
panel)
the
front-panel
switch
will
have
no
control
over
which
preamp
sec¬
tion
is
selected.
7:
TUBE
LED:
This
tube-shaped
symbol
glows
orange
when
the
Tube
preamp
seclion
is
selected,
giving
you
a
quick
visual
reference
as
to
which
preamp
section
is
active.
8:
TUBE
GAIN:
This
serves
as
the
gain
control
for
the
Rhythm
channel's
Tube
preamp
section,
giving
you
con¬
trol
over
the
compression
and
overdrive
characteristics
ot
the
GT-80DSP's
preamp
tube.
Use
this
control
along
with
the
Rhythm
Channel's
level
control
(#20)
to
create
a
wide
variety
of
sounds
at
any
volume
level.
(Some
4
suggested
settings
can
be
found
on
page
12.)
With
tho
control
to
the
full-left
position,
no
signal
passes
through
As
you
bring
the
control
towards
center
you
increase
the
signal
level
and
the
tube
compression,
with
a
bluesy
tube
crunch
coming
to
life
as
you
approach
a
setting
of
8
and
thicker
tube
distortion
in
the
full-right
position.
9:
RHYTHM
LED:
This
LED
glows
green
when
the
Rhylhm
Channel
is
chosen.
and
along
wth
LED
#19,
gives
you
a
visual
sign
that
the
Rhythm
channel
is
active.
10:
SOLID
STATE
GAIN:
This
serves
as
the
gain
control
for
the
Rhythm
channel's
Solid
State
preamp
section.
Use
this
control
along
with
the
Rhythm
Channel's
level
control
(#20)
to
create
a
wide
variety
of
sounds
at
any
vol¬
ume
level.
(Some
suggested
settings
can
be
found
on
page
13.)
With
the
control
to
the
full-left
position,
no
sig¬
nal
passes
through.
As
you
bring
the
control
to
the
right
you
increase
the
signal
level,
which
stays
clean
all
the
way
up
to
the
full-right
position.
LEAP_
CHANNE
L;
11:
LOW:
Adjust
the
Lead
Channel's
low
frequency
output
with
this
control:
the
center
position
is
"flat:
that
is.
no
boost
or
cut.
By
turning
the
control
to
the
left
you
reduce
the
low
trequency
output;
turning
it
to
the
right
in¬
creases
the
low
trequency
output.
The
Low
control
provides
up
to
12dG
of
boost
or
cut
centered
at
100Hz.
12:
MID:
Adjust
the
Lead
Channel's
midrange
output
with
this
control:
in
the
center
position
the
midrange
output
will
be
"flat"
(no
boost
or
cut).
Turning
the
control
to
the
left
reduces
the
midrange
output;
turning
it
to
the
right
increases
the
midrange
output.
The
Mid
control
provides
up
to
5dB
of
boost
or
cut
centered
at
1000Hz,
which
atfects
the
‘voice-
ot
your
guitar's
sound.
13:
HIGH:
Adjust
the
Lead
Channel’s
high
frequency
output
with
this
control
in
the
center
position
the
high
fre¬
quency
output
will
be
"flat"
(no
boost
or
cut).
Turning
the
control
to
the
left
reduces
the
high
frequency
output;
turning
it
to
the
right
increases
the
high
frequency
output.
The
High
control
provides
up
to
ICdB
of
boost
or
cut
centered
at
5000Hz,
which
allows
you
to
adjust
the
crispness
or
the
"bite"
of
your
guitar.
14:
LEAD
LED:
This
LED
glows
red
when
the
Lead
Channel
is
chosen,
and
along
with
LED
#3,
gives
you
a
visu¬
al
sign
that
tho
Load
Gains,
tone
section
and
Master
Level
are
active
15:
LEVEL:
Adjust
the
output
level
of
the
Lead
channel
with
this
control:
in
the
full-left
position
there
is
no
output.
As
you
rotate
the
control
to
the
right
you
increase
the
strength
of
the
Lead
channel's
signal
going
into
the
power
amp,
thus
increasing
the
output
volume.
The
signal
level
to*
the
Line
Out
jack
(see
#32.
rear
panel)
is
simulta¬
neously
affected
by
this
control
RHYTHM
CHANNEL;
16:
LOW:
Adjust
the
Rhythm
Channel's
low
frequency
output
with
this
control:
the
center
position
is
’flat."
that
is.
no
boost
or
cut.
By
turning
the
control
to
the
left
you
reduce
the
low
frequency
output;
turning
it
to
the
right
m--
creases
the
low
trequency
output.
The
Low
control
provides
up
to
12dB
of
boost
or
cut
centered
at
100Hz.
5
CRAJ1E
GT-80DSP
QuadraDrive'"
The
GT-80DSP
Front
Panel
-
Con
't:
*
*
*
Please
refer
to
the
illustration
on
page
4.
*
'
*
17:
MID:
Adjust
the
Rhythm
Channel's
midrange
output
with
this
control:
in
the
center
position
the
midrange
out¬
put
will
be
'flat”
(no
boost
or
cut).
Turning
the
control
to
the
left
reduces
the
midrange
output;
turning
it
to
the
right
increases
the
midrange
outpul.
The
Mid
control
provides
up
to
7dB
of
boost
or
cut
centered
at
800Hz.
which
affects
the
'voice'
of
your
guitar’s
sound.
18:
HIGH:
Adjust
the
Rhythm
Channel's
high
frequency
output
with
this
control:
in
the
center
position
the
high
frequency
output
v/ill
be
“flat"
(no
boost
or
cut).
Turning
the
control
to
the
left
reduces
the
high
frequency
output:
turning
it
to
the
right
increases
the
high
frequency
output.
The
High
control
provides
up
to
15dB
of
boost
or
cut
centered
at
10kHz,
which
albws
you
to
adjust
the
crispness
or
the
'bite'
of
your
guitar.
19:
RHYTHM
LED:
This
LED
glows
green
when
the
Rhythm
Channel
is
chosen,
and
along
v/ith
LCD
#9,
gives
you
a
visual
sign
that
the
Rhythm
channel
is
active.
20:
LEVEL:
Adjust
the
output
level
of
the
Rhythm
channel
with
this
control:
in
the
full-left
position
there
is
no
out¬
put.
As
you
rolate
the
control
to
the
right
you
increase
the
strength
of
the
Rhylhm
channel's
signal
going
into
the
power
amp.
thus
increasing
the
output
vetume.
The
signal
level
tor
the
Line
Out
jack
(see
#31.
rear
panel)
is
si¬
multaneously
affected
by
this
control.
Ibe
Digital
Sound
Processor
(DSP):
I
Gtvea
below
is
a
brief
description
of
the
Digital
Sound
Processor's
controls.
For
complete
informa-
||
tion
on
the
use
and
functions
of
the
Digital
Sound
Processor,
please
see
pages
8
through
11.
21:
LED:
This
LED
indicator
glows
when
the
Digital
Sound
Processor
is
active,
indicating
the
presence
of
a
pro¬
cessed
signal
22:
MODE:
Select
the
type
of
digital
sound
processing
effect
with
this
control.
Each
preamp
and
channel
setting
will
'remember'
its
setting,
allowing
you
to
switch
between
channels
and
preamps
(Tube'Sotid
State)
williout
hav¬
ing
to
reset
the
Mode
control.
Fora
complete
listing
of
the
different
effects
and
their
corresponding
settings,
see
"Usiag
the
Mode
Control"
on
page
8.
23:
LEVEL:
Adjust
the
amount
of
digital
sound
processing
effect
with
this
control:
in
the
full-left
position
the
out¬
put
signal
is
“dry'
(no
revert
or
effect);
rolating
the
control
to
the
right
increases
the
amount
ot
ettect.
24:
ON
LED:
The
word
'ON"
will
glow
red
when
you
turn
tho
GT
GODSP
on.
showing
you
that
the
amplifier
is
ac¬
tivated
and
ready
to
play.
25:
POWER:
This
heavy-duty
rocker-type
switch
is
used
to
turn
the
amplifier
ON
in
the
left
position.
OFF
in
the
right
position.
The
ON
LED
(#24)
works
with
this
switch
as
a
visual
indicator.
6
©
GT-80DSP
Quadr*Drive'
m
The
GT-80DSP
Rear
Panel:
26:
POWER
CORD:
Firmly
plug
the
supplied,
heavy-duty
grounded
power
cord
into
this
receptacle
When
in
use.
be
sure
this
cord
is
properly
plugged
into
a
safely-wired,
grounded
120
volt.
60
cycle
AC
power
outlet.
DO
NOT
attempt
to
defeat
the
ground
connection
on
this
cable!
If
your
GT-80DSP
was
purchased
outside
ot
the
United
States,
see
the
unit’s
rear
panel
for
its
power
rat¬
ing
and
follow
the
above
guidelines.
27:
FUSE:
This
protects
the
amplifier
against
damages
caused
from
a
faulty
AC
power
source
or
other
problems.
It
the
fuse
blows,
replace
it
ONLY
with
the
same
size
and
type
2.5A
120V
sb-blow
fuse.
If
the
fuse
blows
repeat¬
edly
check
the
AC
source
if
rt's
okay,
contact
your
Crate
dealer
for
service
information.
28:
EXTERNAL
SPEAKER:
Allows
you
to
connect
the
output
of
the
GT-80DSP
to
an
external
speaker,
placing
it
in
series
with
tho
12'
speaker
inside
Ihe
amplifier.
Since
this
is
a
series
connection,
there
is
no
chance
of
dam¬
aging
the
amplifier
wilh
too
small
of
an
impedance
load.
However,
keep
in
mind
that
by
adding
speakers
you
raise
the
total
impedance,
which
reduces
the
efficiency
of
the
amplifier,
thus
bringing
down
the
overall
volume
level.
29:
CHANNEL
SELECT
FOOTSWITCH:
A
dual
footswitch
can
be
plugged
in
here
to
give
you
remote
control
for
the
selection
of
the
Lead,Rhythm
channels
AND
the
Tube/Solid
State
preamp
sections.
When
connected,
the
footswitch
overrides
the
front
panel
switches
for
these
functions.
NOTE:
This
is
a
STEREO
1/4“
jack:
"ring'
controls
the
preamp
sections,
"tip"
controls
channel
selection,
'sleeve"
is
ground
for
both.
Use
only
a
stereo-plug
equipped
footswitch
(such
as
the
Crate
FS-60),
or
a
three-way
toot-
switch
(such
as
the
Crate
FS-80)
to
control
Reverb
as
well
-
see
#30.
30:
REVERB
FOOTSWITCH:
A
single
footswitch
can
be
plugged
in
here
to
give
you
remote
control
for
the
Digi¬
tal
Sound
Processing
Mode
tor
all
channels.
The
footswitch
offers
you
a
choice
of
Iv/o
Mode
settings
per
chan¬
nel:
presetting
cne
of
the
choices
to
"bypass"
gives
you
the
traditbnal
“crVoff"
control.
For
additional
information
please
see
‘Using
the
Mode
control'
on
page
8.
31:
EFFECTS
LOOP
LINE
IN:
Connecting
an
external
signal
processor,
such
as
digital
delay
or
echo,
can
be
accomplished
through
the
Line
In
and
Line
Out
jacks.
Connect
the
OUTPUT
of
the
external
device
to
the
Line
In
jack
using
a
shielded
cable
with
mono
1/4"
phone
plugs.
This
sends
the
line-level
signal
IN
to
the
GT-80DSP’s
internal
power
amplifier.
Ihe
Line
In
jack
is
Post-Master
EQ
and
Post-Master
Level.
32:
EFFECTS
LOOP
LINE
OUT:
This
carries
a
pre-amplified.
post-EQ
signal
to
an
external
effects
device,
am¬
plifier.
mixing
console
or
recorder.
Connect
the
Line
Out
jack
to
ihe
INPUT
of
the
device
using
a
shielded
cable
with
mono
1/4"
phone
plugs.
This
sends
a
line-level
signal
OUT
from
the
GT-80DSP.
The
Line
Out
jack
is
Post-
Master
EO
and
Post-Master
Level,
therefore
its
tone
and
output
level
are
governed
by
the
settings
of
the
amplifi¬
ers
controls.
The
Line
Out
jack
is
an
unbalanced
mono
1/4'
type.
7
rRAFE
n.T
.^p
qurinDme-
ABQUT
THE
DIQITAL
SfiUMB
PRO
CESSO
R;
Using
the
Mode
Control:
The
Digital
Sound
Processor's
32
position
Mode
control
allows
you
to
instantly
access
the
exact
type
of
effect
you
want
-
from
classic
reverberation
to
radical
’backwards'
sounds
-
for
any
of
the
preamp
or
channel
set¬
tings.
The
diagram
below
illustrates
where
each
’family"
of
effects
is
located.
Use
this
diagram
along
with
the
table
on
the
facing
page
to
familiarize
yourself
with
the
locations
of
the
many
different
sound
effects
possblo
from
your
GT-80DSP.
The
setting
ot
the
Mode
Control
will
determine
the
type
of
effect
for
whichever
preamptohannel
combina¬
tion
the
amp
is
set
to
at
the
time
you
adjust
the
Mode
control.
Once
set,
the
GT-80DSP's
non-volatile
memory
retains
the
setting
until
you
reset
it.
Example:
Plug
in
your
guitar
and
turn
on
the
amplifier.
Set
Channel
Select
to
Rhythm,
Tube/S.S.
Select
to
Tube.
Now
set
the
Mode
Control
to
’12"
(medium
gated
reverb).
Strike
a
chord
on
your
guitar
and
listen
to
the
sound
of
the
effect.
Press
in
the
Channel
Select
switch
to
choose
the
Lead
Channel,
then
set
the
Mode
Control
to
26
(large
hard
surface
echo).
Strike
a
chord
and
listen
to
the
results.
Now
press
Select
again
to
get
back
to
the
Rhythm
Channel
and
strike
a
chord
-
even
though
you
haven't
changed
the
setting
of
the
Mode
Control,
the
amplifier
'remembered'
that
you
had
programmed
in
setting
'
12
'
and
kept
the
effect
as
you
left
it.
There's
more:
When
a
Reverb
footswitch
is
used,
you
can
program
each
of
the
four
channel/preamp
combinations
with
two
Mode
settings.
If
you
want
to
control
reverb
on/off
with
the
footswitch,
for
example,
set
the
Mode
to
'O'
(bypass),
hit
the
footswitch
and
set
Mode
to
'S'
(large
bright
hall).
Now
you
have
the
ability
to
switch
the
reverb
on
and
off
with
the
footswitch.
With
the
footswitch
you
have
a
choice
of
two
reverb
settings
for
each
of
the
four
preamp/channel
combi¬
nations,
for
the
most
flexibility
and
versatility
possible!
8
tfiil
Table
of
Settings:
The
table
below
lists
each
of
the
32
settings
of
the
GT-80DSP's
Mcde
control,
atong
with
a
brief
explana¬
tion
of
each
effect.
NO.
NAME
OFF
1
I
SMALL
HOOM.BRK1HT
2
SMALL
ROOM.
DAliK
3
SMALL
HALL.
BRIGHT
SMALL
HALL.
5
LARGE
HALL.
BRIGHT
5
LARGE
HALL.
DARK
AVERAGE
CUB.
BRIGHT
AVERAGE
CLL6.
DARK
CONCERT
HALL.
BRIGHT
TO
CONCERT
HAIL.
DARK
11
STADUM
12
GATED
REVERB.
MEDIUM
13
GATED
REVERB.
LONG
14
PLATE
REVERB
15
TRADITIONAL
REVERB
SLAPBACK.
SHORT
17
I
SLAPBACK.
MCDIUM
SLAPBACK.
LONG
19
SHORT
NWDCRATE
SURFACE
ECHO
20
3
IOPT
HARD
SURFACE
ECHO
21
SHORT/MBDPUM
MODERATE
SURFACE
22
MEDIUM
SOFT
SURFACE
ECHO
MEDIUM
HARC
SURFACE
ECHO
MEDIUM
GLASS
SURFACE
FCHO
ECHO
LARGE
SOFT
SURF
ACT
ECHO
CCIIO
IAHGE
MODE
HATE
SURE
ACE
ECHO
ECHO
LARGE
HARD
SURFACE
ECHO
FCHO
28
INFINITE
DELAY
29
THICKENER
MULTI-TAP
31
HZflHVHfl
TYPE
DESCR*»TK>N
NONE
BYPASS
-
no
signal
processing
occurs
_
SMALL
REVER8
fT
*
8nmfly
room
wlh
hardwood
loors
SMALL
RCVCRO
IT
X
a
carpolod
room
win
up
lo
low
pooplo
SMALL
REVERB
20’
*
40"
Rettea&al
Hal
wlh
»wJ
(touts,
hard
wafts.
SMALL
REVERB
20'
x
4(T
carpeted
Rehoarsai
Ha*
win
craped
waas
ard
up
lo
30
peepiu
REVERB
50’
x
100’
•rrpty
Rehearsal
Hal
wlh
20
ceftngs
LARGE
REVERB
50
x
100’
Rehearsal
Hal
wlh
up
lo
50
Irion®
and
crew
LARGE
REVERB
‘00
capacly
emply
dub.
wood
doors,
afteroxxi
jound
chock
LARGE
REVERB
500
cipady
cMb.
wood
lloors.
stilted
wlh
peoptt
IAPGF
RFVERB
SOOOseal
Concert
Hal.
hard
backwal.
aflemoon
sound
check.
IAPOC
ncvtnB
CO0dv»al
Concert
Mol.
SOO
at
bock
Ml,
sold
oul
Bhow
LARGE
REVERB
«).003
seal
round
SJadum.
atlernoon
sound
check,
one
hundred
crew
&
VIPs
only.
SPECIAL
REVERB
SJudro
EMecl
-
Engineer
cuts
c«
rc/ort)
sightly
aTer
each
role.
(220ms
Gale)
SPECIAL
REVERB
audio
Efted
-
Engineer
Isis
note
mg.
then
cuts
I
oil.
(3SCms
Galo)
SPECIAL
REVEH8
audio
Filed
-
SmuMes
Sludo
Steel
PBte
Revet).
SPECIAL
REVERB
Simuhles
DkTIasfacned
muU-sprtng
lube
reverb
uni
_
DEI
AY
l?Srm
dotty
ptes
smel
reverb
Fl/ta’
favorite
delay
ptes
sirol
rcvorb.
RockoWy
ppociaL
5671TB
doay
Ofjy
630
travel
lime
o(
sound.
85ms
delay
wfh
14
2%
regerwralion
&
smalrovob
65ms
delay
wih
27
3%
regeneration.
delay
wlh
21
.
8
%
rcgoooraton
*
small
reverb.
335rre
delay
win
125%
'©generator
dotty
wlh
26.5%
-egeoeraton
8
smal
revert)
335rr»
dotty
wlh
437%
'egeoeraton
485m>
dotty
wlh
7.8%
regonorulion.
465ok
detty
win
20.3%
rogoncrafion
485HB
detty
win
392%
regeneraeon
6
smal
revert)
SPECIAL
EFFECT
I
506ms
detty
wlh
over
90%
regeneration
SPECIAL
EFFECT
33ms
based
sound
tatlener
al
selected
'roqumcios
SPECIAL
EFFECT
Muletuckener
wlh
some
suMe
delays
added
SPECIAL
EFFECT
'Backward*
masking’
ortocl
(nun*er
one.
rvjmber
nine,...)
fltfl/C
GT-80D5P
QuadraDrive"
ABOUT
THE
DIGITAL
SO
UND
PRO
CE
S
SOR
:
(Semi-)
Technical
Description:
"IVhatis
reverb,
anyway?"
Imagine
yourself
seated
in
a
small,
lightly
furnished
room,
about
to
enjoy
a
private
performance
by
your
favorite
guitarist.
The
guitarist
picks
up
an
acoustic
guitar
and
sharply
strikes
a
single
chord,
then
immediately
mutes
the
strings
with
his
strumming
hand.
Sound
wavos
instantaneously
travel
from
the
guitar's
sound
hole
through
the
air
to
you
ears,
where
your
brain
processes
the
waves
into
the
musical
sounds
you
krow
so
well.
At
the
same
time,
reflected
sound
waves
are
bouncing
all
around
the
room:
off
the
walls,
ceiling
and
floor,
off
of
the
musician,
off
of
you;
off
of
everything
in
the
room.
These
multiple
reflections
occur
so
fast
and
in
such
large
num¬
bers
that
your
ears
perceive
them
as
one
sound:
reverb.
Without
these
reflections
the
sound
irom
the
guitar
would
seem
lifeless,
dry
and
unnatural.
Different
rooms
produce
different
reflections,
thus
producing
different
sounding
reverbs.
The
same
gui¬
tarists
singfe-chord
performance
in
a
large
concert
hall
would
sound
different
than
it
did
in
the
intimate
surround¬
ings
described
above,
due
to
the
different
reflections
produced
-
thus,
the
dfferent
sounding
reverb.
Wliat
can
be
produced
by
nature
can
be
simulated
through
the
use
of
the
GT
SODSP's
highly
sophis¬
ticated
digital
electronics
circuitry.
The
GT-80DSP
has
many
different
reverbs
available,
as
well
as
some
unique
digital
effects,
not
found
in
nature.
10
CS£Z^
GT-80DSP
QuadnDnve"
ABOUT
THE
DIGITAL
SOUND
PROCESSOR
:
Block
Diagrams:
Sound
Amplitude
TYPtCAl
RFiRB
RESPONSE
TO
AN
AJPUtSC
Tme
domain
response
ol
a
reve
se
re¬
vet
b,
impulse
mpi/.
Reverb
effect
is
digi¬
tally
reversed
to
produce
the
opposite
sound
pattern
ol
natural
(or
ciglal)
reverb
Time
demain
response
ot
a
typical
reverb,
impulse
input
Early
reflecsons
and
re¬
vert)
'tail'
combned
with
room
character¬
istics
determine
the
sound
of
the
effect
Time
domain
resporse
cf
a
gated
reverb
impulso
input
Povo"b
‘tail’
is
digital!'/
cut
off
just
past
its
peak
Tim©
domain
response
of
a
slapback
ah
loot,
impulse
input
Secondary
signal
is
a
reproduction
of
ttw
original
input
signal
(similar
amplitude)
Time
ooman
resporse
of
a
delay
elect,
impulse
input.
Secondary
signals
are
re¬
productions
of
ongiral
signal,
diminishing
in
amplitude
over
a
fixed
time
period.
Tme
domain
response
of
a
multi
lap
ef¬
fect,
impulse
input.
Secondary
signals
a
'0
reprocuctions
of
orginal
signal,
differing
in
amplitudo.
at
nearly
the
same
time.
DELAY
11
ML
SOME
SU
GGEST
E
D
SETT
INGS:
SPARKLING
CLEAN:
OUT
FUNKY
CLEAN:
OUT
WARM
TUBE:
OUT
BLUESY
DIRT:
OUT
12
GT
80OSP
QuadraDrivef
WARM
TUBE
CRUNCH
HOT
TUBE
LEAD:
i
O.O
b
q
0.0
O
O
0.0
O
O
O.O.OOl
r;
rtm
”
W
infi
I'm
mft
no-
f(V7
°
inn
°w-rr__
SOLID
STATE
LEAD:
Q;;
O
OflQ
S
000.0
001
SOL
D
STATE
CRUNCH:
lit
>
(*•»*/
r
i
m
i
<
I
O
e
O
h
0.0
O
O
O.O
O
O
0.0.0
Oi
0**
e*»<
!0»
i*h
LT
41
tom
no
no-
utu
U
>-«n
ino
.
o
o
mo*
<nc
io*
«r>
««o*
«iiu
3
CRATE
GT-80PSP
QuidraDrivtf"
SYSTEM
BLOCK
DIAGRAM:
12'
CRA
7F
CUSTOM
SPFAKFR
EXTERNAL
SPEAKER
14
QuadraDrive'"
Output
Power
Rating
80
watts
RMS
@5%
THD
8
ohm
toad.
120VAC
Gain
88dB,
tones
at
"5‘
©
1kHz
Tone
Control
Range
Lead
Channel
Low
Mid
High
Rhythm
Channel
Low
Mid
High
24dB
©
100Hz
10dB
0
Ikllz
20dB
©
5kHz
23dB
©
100Hz
14dB
©
800Hz
30dB
0
10kHz
Signal
to
Noise
Ratio
Lead
Channel
S.S.
Tube
Rhythm
Channel
S.S.
Tube
61
dB
57dB
81dB
72dB
Input
Impedance
1
M
ohm
Maximum
Signal
Accepted
rTriwnr
Ti
iKn
"T~\
A
3V
peak
to
peak
12AX7
(1).
12AU7
(2)
MOSFETs
L/river
i
udg
i
ype
Output
Dovico
Typo
Line
Out
Level
.7V
RMS
Internal
Speaker
Size
Type
Magnet
Voice
Coil
RMS
Rating
Impedance
GT-80DSP
12*
Crate
Custom-L
340Z
1.75"
80
Watts
8
ohms
GT-80DSPS
12“
Celestion
G12K-85
40OZ
1.75-
85
Watts
8
ohms
Power
Requirements
120
VAC,
2.5
amps
max.
210-240
VAC,
1.25
amps
max.
Size
and
Weight
17.5“Hx20.25-W
xl0.5“D
40
lbs.
The
GT-80DSP
is
covered
with
a
durable
black
Tolex
material;
the
GT-80DSPS
is
covered
in
tough-as-
nails
black
Ozile.
To
keep
the
cabinet
in
top
condition,
wipe
it
clean
with
a
damp
lint-tree
cloth
to
remove
dirt
and
road
film.
Never
spray
cleaning
agents
directly
onto
the
cabinet,
and
stay
away
from
abrasive
cleaners
which
could
damage
the
finish.
Crate
strives
continually
to
develop
new
products,
as
well
as
find
ways
to
improve
existing
ones.
For
this
reason,
the
specifications
and
information
in
this
Crate
manual
are
subject
to
change
without
notice.
15
CRATE/SLM
ELECTRONICS,
A
DIVISION
OF
ST.
LOUIS
MUSIC.
1400
FERGUSON,
ST.
LOUIS.
MO.
63133
P/N
47-594-01
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1
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