Crate Amplifiers GFX50 User Manual

OWNER’S MANUAL

Congratulations!

You are now the proud owner of the Crate GFX50 TwoTone guitar amplifier. This unique amplifier allows two
guitarists to play simultaneously, making it perfect for students, band practices, and live performances. An easy
to operate DSP section lets you dial in a variety of digital effects such as delay, flange, chorus and reverb. RCA
inputs with a level control allow you to play along with a compact disc, a tape, or a drum machine.

Your GFX50 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

GFX50

DUAL INPUT GUITAR AMPLIFIER

with DIGITAL SIGNAL PROCESSING

GFX50 TwoTone Guitar Amplifier with DSP

The Front Panel:

Channel A and B are independent of each other up to the DSP and
CD inputs. The text below (#1–9) applies to both channels.

1. INPUT: Connect the output signal from your guitar here by means of
a shielded instrument cable.

2. VOLUME: Use this control to set the clean channel’s output signal
level.

3. CLEAN/OVERDRIVE: Use this switch to select the clean channel
(switch in the out position) or the overdrive channel (switch
depressed).

4. OD GAIN: Use this control to set the overdrive channel’s input sig­nal gain. This control works in conjunction with the level control (#8)
to set the amount of distortion and the output signal level of the
overdrive channel.

5. TREBLE: Use this control to adjust the high frequency level of the
output signal. This control has a range of 27dB of boost or cut at
12kHz.

6. MID: Use this control to adjust the midrange frequency level of the
output signal. This control has a range of 20dB of boost or cut at

1.5kHz.

7. BASS: Use this control to adjust the low frequency level of the out­put signal. This control has a range of 28dB of boost or cut at 40Hz.

8. OD LEVEL: Use this control to set the overdrive channel’s output
signal level. (Works in conjunction with the gain control, #4.)

9. EFFECTS: Use this control to set the amount of DSP effects applied
to the output signal.

10. DSP MODE: Use this control to select the type of digital signal pro­cessing effect(s) applied to the output signal. Each effect and its
location is called out by the markings around the control. The effects
are as described as follows:

BYPASS: No effect
DELAY 1: Short delay effect
DELAY 2: Long delay effect
FLANGE: Light flanging effect

CHO 1: Slow chorus effect
CHO 2: Fast chorus effect

CHO+REV: Slow chorus effect with reverberation

REV 1: Small room reverberation
REV 2: Large hall reverberation

11. DSP LEVEL: Use this control to set the amount of digital effect

applied to the output signal.

12: CD INPUTS LEVEL: Use this control to adjust the level of the signal

applied to the the CD input jacks (#13).

13. CD INPUT JACKS: Use these jacks to connect the output of a CD
or tape player to the amp. (The jacks are internally summed to cre­ate a mono signal.)

14. HEADPHONES: Use these jacks to connect one or two pairs of
stereo headphones to the amplifier. When the headphones are
used, the internal speaker is disconnected.

15. LED: This LED illuminates when the amplifier is on.

16. POWER: Use this switch to turn the amplifier on and off. The ampli-

fier is on when the top of the switch is depressed; off when the bot­tom of the switch is depressed.

17. AC LINE CORD(rear panel, not shown): Plug this cord into a prop­erly wired, grounded, 120 volt, 60 cycle ACoutlet. DO NOT attempt
to defeat the ground connection of this power cord! If your ampli­fier was purchased outside of the United States, see the unit’s rear
panel labeling for its power rating, and follow the above guidelines.

System
Block
Diagram:

1 2 4 5 6 7 8 10 11 12 14 16151393

CHANNEL A:

INPUT

VOLUME

CHANNEL B:

INPUT

VOLUME

CLEAN

CLEAN

OD

GAIN

OVER­DRIVE

OD

GAIN

OVER­DRIVE

OD

LEVEL

TREBLE MID BASS

OD

LEVEL

TREBLE MID BASS

EFFECTS

EFFECTS

MODE

DSP

LEVEL

STAGE

LEVEL

MIX

CD

INPUTS

POWER

AMP

SPEAKER

HEAD
PHONES