GX-140C / CH
STEREO CHORUS AMPLIFIER
OWNER’S MANUAL
Congratulations!
You are now the proud owner of the versatile and powerful Crate GX-140C
Combo Amplifier / GX-140CH Amp Head with Stereo Chorus. With two flexible
channels, Crate’s patented “Flex Wave” distortion circuitry, a Stereo Effects Loop
and three footswitchable functions, the GX-140C/CH offers you more flexibility
and performance than any amplifier in its class.
Like all Crate products, your GX-140C/CH is Musician Made in the U.S.A.,
using only the best components. 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 of your new amplifier, we strongly urge you to go
over the information contained in this manual before you begin playing.
And thank you for choosing
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GX-140C/CH Amplifier
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FRONT PANEL:
11: LOW: Adjusts the low frequency output level: to the left
reduces the low frequency output; to the right increases it.
This control allows a range of 20dB at 100Hz.
1: INPUT: Connect your guitar here using a shielded
instrument cable.
OVERDRIVE CHANNEL: A high gain channel giving you
sounds from a slight edge to serious overdrive.
12: MID: Adjusts the mid frequency output level: to the left
reduces the midrange output; turning it to the right increas-
es it. This control allows a range of 14dB at 700Hz.
2: GAIN 1: When active, sets the amount of compression
and distortion from the amplifier. At far left, the sound will
have a thick compressed quality. As you turn the control to
the right the amount of distortion increases. Gain 1 pro-
duces less intense distortion than Gain 2 and is active only
when the Gain Select switch (#5) is out.
13: HIGH: Adjusts the high frequency output level: to the
left reduces the high frequency output; to the right increas-
es it. This control allows a range of 27dB at 10kHz.
14: REVERB, OVERDRIVE: Adjust the amount of reverb
for the Overdrive Channel with this control: in the full-left
position the output signal is “dry” (no reverb); rotating the
control to the right increases the amount of effect.
3: GAIN 2: When active, sets the amount of compression
and distortion from the amplifier. At far left, the sound will
have a thick compressed quality. As you turn the control to
the right the amount of distortion increases. Gain 2 is pro-
duces more intense distortion than Gain 1 and is active
only when the Gain Select switch (#5) is in.
15: REVERB, CLEAN: Adjust the amount of reverb for the
Clean Channel with this control: in the full-left position the
output signal is “dry” (no reverb); rotating the control to the
right increases the amount of effect.
4: SHAPE: Working in conjunction with the Gain 2 control,
rotate the Shape control until you find the sound you’re
looking for. Turning the control towards the left enhances
the mid frequencies; turning it to the right enhances the low
and high frequencies. (Only affects Gain 2 when active.)
16: INSERT LOOP: Connect an external effects device via
this jack. Use a stereo 1/4” male Y-cord: ring = send, tip =
return, sleeve = ground. See the illustration on the panel to
the right for more information. This is a mono pre-chorus
effects loop.
5: GAIN SELECT: Switches between Gain 1 (out) and
Gain 2 (in). A footswitch (see #28, rear panel) overrides
this switch.
17: CHORUS ON/OFF: Turn the Chorus/Expander on and
off with this switch. When the switch is pressed in, the
Chorus/Expander is active. A footswitch (see #29, rear
panel) overrides this switch.
6: LOW: Adjusts the low frequency output level: to the left
reduces the low frequency output; to the right increases it.
This control allows a range of 10dB at 80Hz.
18: CHORUS/EXPANDER: Select between the built-in
stereo chorus or the “expander” circuit with this switch.
When the switch is pressed in, the chorus section is select-
ed. When the switch is out, the amplifier’s expander circuit
is activated, giving the sound a wide-open, “spatial” effect.
In order for either effect to be active, the Chorus On/Off
switch (#17) must be pressed in.
7: HIGH: Adjusts the high frequency output level: to the left
reduces the high frequency output, to the right increases it.
This control allows a range of 10dB at 7kHz.
8: LEVEL: Sets the output volume level from Channel A: in
the far-left position there is no output; turning the control to
the right increases the output. Use this control along with
the Gain and Shape controls (#2, 3 & 4) to create a wide
variety of sounds.
19: DEPTH: Set the intensity of the chorus effect with this
control: in the far left position there will be almost no cho-
rus; as you rotate the control to the right the amount of
effect increases.
9: CHANNEL SELECT: When this switch is pressed in the
Overdrive Channel is engaged. The Clean Channel is
selected when this switch is out. Afootswitch (see #28, rear
panel) overrides this switch. The adjacent LEDs indicate
which channel is selected.
20: RATE: Set the speed of the chorus effect with this con-
trol: to the left for slow, smooth “phasing” sounds, to the
right for faster “vibrato” sounds.
21: POWER SWITCH: Turns the amplifier ON in the up
position, off in the down position. The Channel LED for the
selected channel will light when the amp is switched on.
CLEAN CHANNEL: A normal gain channel designed to
give you crystal clear sounds.
10: LEVEL: Sets the output volume level from the Clean
Channel: in the far-left position there is no output; turning
the control to the right increases the output level.
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GX-140C/CH Amplifier
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REAR PANEL:
22: AC LINE IN: This heavy-duty, grounded, three-wire 28: CHANNEL/GAIN SELECT FOOTSWITCH: Plug a
power cord is to be plugged into ONLY a safely-wired, dual footswitch (such as the Crate CFP-2 or the “stereo”
grounded 120 volt, 60 cycle AC power outlet. DO NOT plug of the Crate CFP-3) here to control Channel Selection
attempt to defeat the ground connection of this cable! If and the Gain Select button. The footswitch overrides the
your GX-140C/CH was purchased outside of the United front panel switches (#5 and 9) and is wired as follows:
States, see the unit’s rear panel for its power rating and fol- Ring = Gain Select, tip = Channels, sleeve = ground.
low the above guidelines.
29: CHORUS/EXPANDER FOOTSWITCH: Plug a single
23,24: POWER AMP 1, 2 SPEAKERS: You may connect footswitch (such as the Crate CFP-1 or the “mono” plug of
the outputs of the GX-140C/CH to your external speakers the Crate CFP-3) here to control the Chorus/Expander.
using these jacks. When connecting speakers use a The footswitch overrides the front panel on/off switch
matched pair; that is, two speakers with the same imped- (#17); selection between the Chorus and the Expander is
ance to insure optimum performance from the amplifier. still controlled by the front panel selector switch (#18).
The amp 2 speaker jack (#24) carries the chorus signal
(when the chorus is on) while the amp 1 jack (#23) is “dry”
(without the chorus effect).
NOTE: The total impedance for each side should not be
Connecting to the Insert jack:
less than 4 ohms.
The Insert jack (#16) lets you patch external effects into the
amplifier just prior to its power amp stage. Use Crate’s
STP201, STP202 or STP203 stereo-to-mono Y-cord or an
adapter such as Crate’s YPP117 and 2 1/4” mono signal
cables to connect to the effect as shown below.
WARNING: DO NOT attempt to use headphones in the
Speaker jacks! Permanent hearing damage could result!
Stereo-to-mono Y-cord:
Y-adapter and 2 cables:
IMPORTANT NOTE ABOUT CERTAIN EXPORT UNITS:
In some areas 1/4” speaker jacks are not acceptable
for use on amplifiers capable of high output power
levels. For this reason the 1/4” speaker jacks on your
amplifier may be sealed – in this case, use the
Speakon® jacks provided.
TIP
RING
SLEEVE
RETURN
TIP
to Insert
jack
to Insert
jack
SEND
RING
GROUND
SLEEVE
(STP201, 3'
STP202, 6'
STP203, 9')
(YPP117)
25: STEREO LINE IN: When using a stereo effects
deivce, connect its output here. This stereo 1/4” phone
jack is wired as follows: Ring = amp 1, tip = amp 2, sleeve
= ground.
26: STEREO LINE OUT: When using a stereo effects
deivce, connect this jack to its input. This stereo 1/4”
phone jack is wired as follows: Ring = output 1, tip = out-
put 2, sleeve = ground.
(1/4"-TO-1/4"
MONO SHIELDED
CABLES)
to
to
to
effect
"IN"
to
effect
"IN"
If your effects device has stereo input and output jacks,
use a pair of three-conductor stereo patch cords to con-
nect to it. If the device has separate left and right jacks, use
a pair of one-stereo-male to two-mono-female Y-adapters
to make the connections, as shown to the right.
effect
"OUT"
jack
effect
"OUT"
jack
jack
jack
External Effect
External Effect
Speakon is a registered trademark of Neutrik U.S.A.
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GX-140C/CH Amplifier
GX-140C/CH TECHNICAL SPECIFICATIONS
Output Power Rating
70 watts RMS @ 5% THD 8 ohms load 120VAC
100 watts RMS @ 5% THD 4 ohms load 120VAC
Speaker Size and Rating (GX-140C only)
Crate Custom Design 12” with 1-3/4” voice coil
Power Handling: 65 Watts RMS
Maximum Input Signal Level Accepted
Total System Gain
8 volts, peak-to-peak
Overdrive Channel: 108dB @ 1kHz
Clean Channel: 56dB @ 1kHz
Input Impedance
470k ohms
Overdrive Channel:
Low Control:
Shape Control:
High Control:
10dB Range @ 80Hz
Proprietary Circuit
10dB Range @ 7kHz
Clean Channel:
Low Control:
Mid Control:
High Control:
20dB Range @ 100Hz
14dB Range @ 700Hz
27dB Range @ 10kHz
Input Power Requirements
120 VAC, 60Hz, 230VA
100/115VAC, 50/60Hz, 230VA
230VAC, 50/60Hz, 230VA
Cabinet Size and Weight:
GX-140C:
20” H x 26-1/2” W x 11” D, 58 lbs.
GX-140CH:
12-1/2” H x 30-3/4” W x 10-1/2” D, 35 lbs.
The GX-140C/CH is covered with a durable black Tolex material:
wipe it clean with a lint-free cloth. Never spray cleaning agents onto
the cabinet. Avoid abrasive cleansers which could damage the finish.
CAUTION
ATTENTION
VORSICHT
RISK OF ELECTRIC SHOCK
DO NOT OPEN
RISQUE D'ELECTROCUTION
NE PAS OUVRIR
ELEKTRISCHE SCHLAGGEFAHR
NICHT OFFENEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER.
ATTENTION: POUR REDUIRE D'ELECTROCUTION NE PAS
ENLEVER LE COUVERCLE. AUCUNE PIECE INTERNE N'EST REPRABLE
PAR L'UTILISATEUR. POUR TOUTE REPARATION, S'ADRESSER A UN
TECHNICIEN QUALIFIE.
VORSICHT: ZUR MINIMIERUNG ELEKTRISCHER SCHLAGGEFAHR NICHT
DEN DECKEL ABENHMEN. INTERNE TEILE KONNEN NICHT VOM
BENUTZER GEWARTET WERDEN. DIE WARTUNG IS QUALIFIZIERTEM
WARTUNGSPERSONAL ZU UBERLASSEN.
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
THIS EQUIPMENT HAS BEEN DESIGNED AND ENGINEERED TO PROVIDE SAFE AND RELIABLE OPERATION. IN ORDER TO PROLONG THE LIFE OF THE
UNIT AND PREVENT ACCIDENTAL DAMAGES OR INJURY, PLEASE FOLLOW THESE PRECAUTIONARY GUIDELINES:
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT OPEN CHASSIS; DO NOT DEFEAT OR REMOVE THE GROUND PIN OF THE POWER
CORD; CONNECT ONLY TO A PROPERLY GROUNDED AC POWER OUTLET.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
CAUTION: NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
CAUTION: OUR AMPLIFIERS ARE CAPABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS. CONTINUED EXPOSURE TO HIGH SOUND PRESSURE
LEVELS CAN CAUSE PERMANENT HEARING IMPAIRMENT OR LOSS. USER CAUTION IS ADVISED AND EAR PROTECTION IS RECOMMENDED IF UNIT IS
OPERATED AT HIGH VOLUME.
EXPLANATION OF GRAPHICAL SYMBOLS:
EXPLICACION DE SIMBOLOS GRAFICOS:
EXPLICATION DES SYMBÔLES GRAPHIQUES:
"IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL"
“ES NECESARIO QUE EL USUARIO SE REFIERA AL MANUAL DE INSTRUCCIONES.”
"REFERREZ-VOUS AU MANUAL D'UTILISATION"
"DANGEROUS VOLTAGE"
“VOLTAJE PELIGROSO”
"DANGER HAUTE TENSION"
"GEFAHLICHE SPANNUNG"
=
=
"UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGEN"
Crate continually develops new products, as well as improves existing ones. For this reason, the
specifications and information in this Crate manual are subject to change without notice.
©2001 SLM ELECTRONICS, A DIVISION OF ST. LOUIS MUSIC, 1400 FERGUSON, ST. LOUIS, MO. 63133
P/N 47-474-01 • 05/01
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