Crate Amplifiers Stereo Amplifier GT 80D User Manual

tm  
QuadraDrive  
Amplifier with  
Digital Sound Processing  
OWNER’S MANUAL  
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GT-80D QuadraDrive  
Congratulations!  
You are now the proud owner of one of the newest and most innovative guitar amplifiers available, the  
Crate GT-80D QuadraDrivetm with Digital Sound Processing. This versatile and compact amplifier fea-  
tures four separate, footswitchable Gain controls, with your choice of Tube or Solid State preamps for  
either the Clean or the Overdrive 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 abil-  
ity to “remember” settings for each preamp and channel selection.  
Like all Crate products, your GT-80D is proudly made in America, using only the best components.  
Extensive testing at the hands (and ears) of skilled technicians and musicians insures you that this ampli-  
fier 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 con-  
tained in this manual before you begin playing  
And thank you for choosing  
TABLE OF CONTENTS:  
About the GT-80D . . . . . . . . . . . . . . . . . . . . . . . . . . .3  
The GT-80D Front Panel . . . . . . . . . . . . . . . . . . . . .4-6  
The GT-80D Rear 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 . . . . . . . . . . . . . . . .back cover  
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.  
NO USER-SERVICEABLE PARTS INSIDE.  
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.  
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.  
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: THIS UNIT IS 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 RECOMMENDED IF  
UNIT IS OPERATED AT HIGH VOLUME. THE CHART BELOW SHOWS THE U.S. GOVERNMENT’S OCCUPATIONAL SAFETY AND HEALTH ADMINIS-  
TRATION (OSHA) REGULATIONS WHICH WERE IN EFFECT AT THE TIME OF THIS PUBLICATION FOR PERMISSIBLE NOISE EXPOSURE, PER  
29CFR1910.95, TABLE G-16:  
SOUND LEVEL DBA, DURATION PER DAY  
SOUND LEVEL DBA, DURATION PER DAY  
SLOW RESPONSE  
IN HOURS  
SLOW RESPONSE  
IN HOURS  
90  
92  
8
6
4
3
2
102  
105  
110  
115  
1 - 1 1/2  
1
95  
1/2  
1/4 or less  
97  
100  
ACCORDING TO OSHA, ANY EXPOSURE IN EXCESS TO THESE AMOUNTS LISTED ABOVE COULD RESULT IN SOME HEARING LOSS.  
"IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL"  
"REFERREZ-VOUS AU MANUAL D'UTILISATION"  
"UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGEN"  
"DANGEROUS VOLTAGE"  
"DANGER HAUTE TENSION"  
"GEFAHLICHE SPANNUNG"  
EXPLANATION OF  
GRAPHICAL SYMBOLS:  
=
=
2
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GT-80D QuadraDrive  
ABOUT THE GT-80D:  
The Crate GT-80D QuadraDrivetm with Digital Sound Processing is truly unique and versatile, offer-  
ing you more performance and flexibility than any other compact amplifier.  
Start with two completely separate preamp stages: Solid State and Tube. Then add the two channels:  
Clean and Overdrive. Put them together and you have your choice of some of the hottest contemporary  
sounds and the coolest vintage sounds available. For example, Solid State Clean gives you “today’s  
sound:” crisp highs and an ultra-tight bass response, while Tube Clean offers you that vintage tube sound,  
from ultra-clean to a bluesy crunch. Solid State Overdrive gives you all of the traditional Crate Mega-Gain  
hard rock sizzle and fire, with lots of definition and compression, and Tube Overdrive 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 effects  
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 footswitch and you can preset TWO settings per pre-  
amp/channel choice, for up to 8 instantly accessible effects. And the GT-80D’s memory is “non-volatile”  
which means that once you enter your settings, they’re in the memory until you change them!  
FEATURES OVERVIEW:  
Given below is a quick overview of the GT-80DSP’s features and controls:  
Two Completely Separate Channels: Independent Gains, 3-band EQs, and Levels.  
Four Gain Controls: Tube Overdrive, Solid State Overdrive, Tube Clean, Solid State Clean.  
Digital Sound Processing: A wide variety of digital reverbs and effects. The ability to store settings  
for each of the four channel/preamp combinations. Footswitchable, with 2 settings per combinations.  
Tube Driven Mosfet Power Amplifier: Crate exclusive. No traditional solid state output devices  
means no chance of harsh “square wave” distortion.  
Total Footswitch 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.  
Effects Loop: 1/4” Line Out/Line In jacks. Allows external signal processor connection. Allows  
direct connection to external amplifier, mixer, recording console or whatever.  
3
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GT-80D QuadraDrive  
THE GT-80D FRONT PANEL:  
1
2
3
4
5 6  
7
8
9
10  
11  
12  
13 14 15  
16  
17  
18 19 20 21 22  
23  
24  
25  
1: INPUT: Connect your guitar here using a shielded instrument cable.  
OVERDRIVE Gains:  
2: TUBE GAIN: This serves as the gain control for the Overdrive Channel’s Tube preamp section, giving you con-  
trol over the compression and overdrive characteristics of the GT-80DSP’s input tubes. Use this control along with  
the Overdrive Channel’s volume control (#15) to create a wide variety of sounds at any volume level. (Some sug-  
gested settings can be found on page 12.) 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 the tube compression, with maximum tube  
distortion towards the full-right position.  
3: OVERDRIVE LED: This LED glows red when the Overdrive Channel is chosen, and along with LED #14 gives  
you a visual sign that the Overdrive gains, tone controls and volume control are active.  
4: SOLID STATE GAIN: This serves as the gain control for the Overdrive channel’s Solid Sate preamp section.  
Use this control along with the Overdrive Channel’s volume control (#15) to create a wide variety of sounds at any  
volume 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 towards center you increase the signal level and compression, reach-  
ing maximum distortion in the full-right position.  
5: CHANNEL: Select either the Overdrive channel (switch in the IN position) or the Clean Channel (switch OUT)  
with this pushbutton switch. The channel indicator LEDs (#3 and 14 for Overdrive, #9 and 19 for Clean) 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 connected 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 section is select-  
ed.  
7: TUBE LED: This tube-shaped symbol glows orange when the Tube preamp section is selected, giving you a  
quick visual reference as to which preamp section is active.  
CLEAN Gains:  
8: TUBE GAIN: This serves as the gain control for the Clean Channel’s Tube preamp section, giving you control  
over the compression and overdrive characteristics of the GT-80D’s preamp tube. Use this control along with the  
Clean Channel’s volume control (#20) to create a wide variety of sounds at any volume level. (Some suggested  
settings can be found on pages 12 and 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 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.  
4
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GT-80D QuadraDrive  
9: CLEAN LED: This LED glows green when the Clean Channel is chosen, and along with LED #19, gives you a  
visual sign that the Clean gains, tone controls and volume control are active.  
10: SOLID STATE GAIN: This serves as the gain control for the Clean Channel’s Solid State preamp section. Use  
this control along with the Clean Channel’s volume control (#20) to create a wide variety of sounds at any volume  
level. (Some suggested settings can be found on pages 12 and 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.  
OVERDRIVE CHANNEL:  
11: LOW: Adjust the Overdrive 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  
increases the low frequency output. The Low control covers a range of 24dB at 100Hz.  
12: MID: Adjust the Overdrive 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 output. The Mid control covers a range of 10dB at 1kHz, which affects the “voice” of your  
guitar’s sound.  
13: HIGH: Adjust the Overdrive Channel’s high frequency output with this control: in the center position the high  
frequency 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 covers a range of 20dB at 5kHz, which  
allows you to adjust the crispness or the “bite” of your guitar.  
14: OVERDRIVE LED: This LED glows red when the Overdrive Channel is chosen, and along with LED #3, gives  
you a visual sign that the Overdrive gains, tone controls and volume control are active.  
15: VOLUME: Adjust the output level of the Overdrive 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 Overdrive Channel’s signal going into  
the power amp, thus increasing the output volume. The signal level for the Line Out jack (see #32, rear panel) is  
simultaneously affected by this control.  
CLEAN CHANNEL:  
16: LOW: Adjust the Clean 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 increases  
the low frequency output. The Low control covers a range of 23dB at 100Hz.  
17: MID: Adjust the Clean 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 covers a range of 14dB at 800Hz, which affects the “voice” of your  
guitar’s sound.  
5
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GT-80D QuadraDrive  
THE GT-80D FRONT PANEL - CON’T:  
* * * Please refer to the illustration on page 4. * * *  
18: HIGH: Adjust the Clean 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; turn-  
ing it to the right increases the high frequency output. The High control covers a range of 30dB at 10kHz, which  
allows you to adjust the crispness or the “bite” of your guitar.  
19: CLEAN LED: This LED glows green when the Clean Channel is chosen, and along with LED #9, gives you a  
visual sign that the Clean gains, tone controls and volume control are active.  
20: VOLUME: Adjust the output level of the Clean Channel with this control: in the full-left position there is no out-  
put. As you rotate the control to the right you increase the strength of the Clean Channel’s signal going into the  
power amp, thus increasing the output volume. The signal level for the Line Out jack (see #31, rear panel) is simul-  
taneously affected by this control.  
The Digital Sound Processor (DSP):  
Given below is a brief description of the Digital Sound Processors controls. For complete infor-  
mation 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  
processed 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/Solid State) without hav-  
ing to reset the Mode control. For a complete listing of the different effects and their corresponding settings,  
see Using the Mode Controlon 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 reverb or effect); rotating the control to the right increases the amount of effect.  
24: ON LED: The word “ON” will glow red when you turn the GT-80D on, showing you that the amplifier is acti-  
vated 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
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GT-80D QuadraDrive  
THE GT-80D REAR PANEL:  
100/120VAC - 2 1/2A NORMAL BLOW  
220-240VAC - 1 1/2A NORMAL BLOW  
CHANNEL/  
TUBE  
LINE  
IN  
LINE  
OUT  
REVERB  
CAUTION  
CAUTION: CHASSIS SURFACE HOT.  
RISK OF ELECTRIC  
SHOCK – DO NOT OPEN  
EXTERNAL  
SPEAKER  
FOOT  
SWITCH  
EFFECTS  
LOOP  
ATTENTION: SUPERFACIE DE  
CHASSIS EST CHAUDE.  
CAUTION:  
TO RE- ATTENTION:  
DUCE THE RISK OF FIRE, UTILISER UN FUSIBLE DE  
REPLACE FUSE WITH RECHARGE DE MEME  
SAME TYPE AND RAT- TYPE.  
ING.  
AVIS:RISQUE DE CHOC ELECTRIQUE  
NE PAS OUVRIR  
TO REDUCE THE RISK OF ELECTRIC SHOCK,  
DO NOT EXPOSE THIS EQUIPMENT TO RAIN  
OR MOISTURE.  
12AU7  
12AX7  
12AU7  
26  
27  
28  
29  
30  
31  
32  
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-80D was purchased outside of the United States, see the unit’s rear panel for its power rating and  
follow the above guidelines.  
27: FUSE: This protects the amplifier against damages caused from a faulty AC power source or other problems.  
If the fuse blows, replace it ONLY with the same size and type use. If the fuse blows repeatedly check the AC  
source: if it’s okay, contact your Crate dealer for service information.  
28: EXTERNAL SPEAKER: Allows you to connect the output of the GT-80D to an external speaker, placing it in  
series with the 12” speaker inside the amplifier. Since this is a series connection, there is no chance of damaging  
the amplifier with too low an impedance load.  
29: CHANNEL SELECT FOOTSWITCH: A dual footswitch can be plugged in here to give you remote control for  
the selection of the Overdrive/Clean 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 CFP-2), or a three-way foot-  
switch (such as the Crate CFP-3) 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 Digital  
Sound Processing Mode for all channels. The footswitch offers you a choice of two Mode settings per channel:  
presetting one of the choices to “bypass” gives you the traditional “on/off” 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-80D’s inter-  
nal power amplifier. The 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, ampli-  
fier, mixing console or recorder. Connect the Line Out jack to the INPUT of the device using a shielded cable with  
mono 1/4” phone plugs. This sends a line-level signal OUT from the GT-80D. The Line Out jack is Post-Master EQ  
and Post-Master Level, therefore its tone and output level are governed by the settings of the amplifiers controls.  
The Line Out jack is an unbalanced mono 1/4” type.  
7
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GT-80D QuadraDrive  
ABOUT THE DIGITAL SOUND PROCESSOR:  
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  
settings. 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 possible  
from your GT-80D.  
12–15  
SPECIAL  
REVERBS  
16–18  
DELAYS  
19–27  
DELAYS  
WITH  
REGEN  
(ECHO)  
5–11  
LARGE  
AREA  
REVERBS  
1–4  
SMALL AREA  
REVERBS  
28–31  
SPECIAL  
EFFECTS  
The setting of the Mode Control will determine the type of effect for whichever preamp/channel combination  
the amp is set to at the time you adjust the Mode control. Once set, the GT-80D’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 Clean, Tube/Solid State 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 Overdrive 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 Clean 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.  
Theres more: When a Reverb footswitch is used, you can program each of the four channel/preamp combi-  
nations with two Mode settings. If you want to control reverb on/off with the footswitch, for example, set the Mode  
to “0” (bypass), hit the footswitch and set Mode to “5” (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 combina-  
tions, for the most flexibility and versatility possible!  
8
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GT-80D QuadraDrive  
ABOUT THE DIGITAL SOUND PROCESSOR:  
Table of Settings:  
The table below lists each of the 32 settings of the GT-80D’s Mode control, along with a brief explanation  
of each effect.  
NO. NAME  
TYPE  
DESCRIPTION  
0
1
2
3
4
5
6
7
8
9
OFF  
NONE  
Bypass—no signal processing occurs.  
SMALL ROOM, BRIGHT  
SMALL ROOM, DARK  
SMALL HALL, BRIGHT  
SMALL HALL, DARK  
LARGE HALL, BRIGHT  
LARGE HALL, DARK  
AVERAGE CLUB, BRIGHT  
AVERAGE CLUB, DARK  
CONCERT HALL, BRT  
SMALL REVERB  
SMALL REVERB  
SMALL REVERB  
SMALL REVERB  
LARGE REVERB  
LARGE REVERB  
LARGE REVERB  
LARGE REVERB  
LARGE REVERB  
LARGE REVERB  
LARGE REVERB  
SPECIAL REVERB  
SPECIAL REVERB  
SPECIAL REVERB  
SPECIAL REVERB  
DELAY  
8’ x 8’ empty room with hardwood floors.  
8’ x 8’ carpeted room with up to four people.  
20’ x 40’ Rehearsal Hall, wood floors, hard walls.  
20’ x 40’ carpeted Rehearsal Hall with draped walls and up to 30 people.  
50’ x 100’ empty Rehearsal Hall, 20’ ceilings.  
50’ x 100’ Rehearsal Hall with up to 50 friends and crew.  
500 capacity empty club, wood floors, afternoon sound check.  
500 capacity club, wood floors, stuffed with people.  
5,000-seat Concert hall, hard back wall, afternoon sound check.  
5,000-seat Concert hall, sold out show.  
10 CONCERT HALL, DARK  
11 STADIUM  
40,000-seat round Stadium, afternoon sound check, 100 crew & VIPs only.  
Studio Effect–Engineer cuts off reverb slightly after each note. (220ms Gate)  
Studio Effect—Engineer lets note ring, then cuts it off. (350ms Gate)  
Studio Effect—Simulates Steel Plate Reverb.  
Studio Effect—Simulates old-fashioned multi-spring tube reverb unit.  
125ms delay + small reverb; Elvis’ favorite.  
12 GATED REVERB, MEDIUM  
13 GATED REVERB, LONG  
14 PLATE REVERB  
15 TRADITIONAL REVERB  
16 SLAPBACK, SHORT  
17 SLAPBACK, MEDIUM  
18 SLAPBACK, LONG  
DELAY  
350ms delay + small reverb; Rockabilly special.  
557ms delay only, 630’ travel time of sound.  
DELAY  
19 SHORT MEDIUM SURFACE ECHO  
20 SHORT HARD SURF ECHO  
21 SHORT/MEDIUM MEDIUM SURF  
22 MEDIUM SOFT SURFACE ECHO  
23 MEDIUM HARD SURFACE ECHO  
24 MEDIUM GLASS ECHO  
25 LARGE SOFT SURFACE ECHO  
26 LARGE MEDIUM SURFACE ECHO  
27 LARGE HARD SURF ECHO  
28 INFINITE DELAY  
ECHO  
85ms delay with 14.2% regen. & small reverb.  
85ms delay with 27.3% regeneration.  
ECHO  
ECHO  
280ms delay with 21.8% regen & small reverb.  
335ms delay with 12.5% regeneration.  
ECHO  
ECHO  
335ms delay with 26.5% regen. & small reverb.  
335ms delay with 43.7% regeneration.  
ECHO  
ECHO  
485ms delay with 7.8% regeneration.  
ECHO  
485ms delay with 20.3% regeneration.  
ECHO  
485ms delay with 39.2% regen & small reverb.  
506ms delay with over 90% regeneration.  
SPECIAL EFFECT  
SPECIAL EFFECT  
SPECIAL EFFECT  
SPECIAL EFFECT  
29 THICKENER  
33ms-based sound fattener @ selected freqs.  
Multi-thickener with some subtle delays added.  
“Backwards masking” effect (number nine, number nine,...)  
30 MULTI-TAP  
31 REVERSE  
9
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GT-80D QuadraDrive  
ABOUT THE DIGITAL SOUND PROCESSOR:  
(Semi-) Technical Description:  
“What is 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 waves 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 know 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 from the guitar would  
seem lifeless, dry and unnatural.  
Different rooms produce different reflections, thus producing different sounding reverbs. The same guitarist’s  
single-chord performance in a large concert hall would sound different than it did in the intimate surroundings  
described above, due to the different reflections produced - thus, the different sounding reverb.  
What can be produced by nature can be simulated through the use of the GT-80D’s highly sophisticated digi-  
tal electronics circuitry. The GT-80D has many different reverbs available, as well as some unique digital effects,  
not found in nature.  
NON-VOLATILE  
CONTROL  
PARAMETER  
SWITCHES  
MEMORY  
Algorithm  
Selection  
Channel  
Switching  
ANALOG INPUT  
FROM AMPLIFIER  
DIGITAL  
SIGNAL  
ANALOG OUTPUT  
I0I0I...  
DIGITAL  
DIGITAL  
ANALYSIS  
SYNTHESIS  
ANALOG/  
DIGITAL  
DIGITAL/  
ANALOG  
CONVERTER  
CONVERTER  
COMPUTER  
INPUT FILTERS  
(ANTI-ALIASING  
FILTER)  
OUTPUT FILTERS  
(RECONSTRUCTION  
FILTER)  
SAMPLE  
STORAGE  
MEMORY  
PROGRAM  
MEMORY  
10  
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GT-80D QuadraDrive  
ABOUT THE DIGITAL SOUND PROCESSOR:  
Block Diagrams:  
TYPICAL REVERB RESPONSE  
Sound  
REVERSE REVERB EFFECT  
TO AN IMPULSE  
Amplitude  
Time  
EARLY  
RELECTIONS  
REVERB  
"TAIL"  
Time domain response of a reverse reverb,  
impulse input. Reverb effect is digitally  
reversed to produce the opposite sound  
pattern of natural (or digital) reverb.  
PRE-  
DELAY  
REVERB (DECAY) TIME  
Time domain response of a typical reverb,  
impulse input. Early reflections and reverb  
"tail" combined with room characteristics  
determine the sound of the effect.  
GATED REVERB  
GATED REVERB  
Time domain response of a gated reverb,  
impulse input. Reverb "tail" is digitally cut off  
just past its peak.  
DELAY TIME  
Time domain response of a slapback effect,  
impulse input. Secondary signal is  
a
reproduction of the original input signal  
(similar amplitude).  
DELAY WITH REGEN  
FIXED PERCENTAGE OF  
ATTENUATION EACH  
DELAY TIME  
MULTITAP  
Time domain response of a delay effect,  
impulse input. Secondary signals are  
reproductions of the original signal, diminishing  
in amplitude over a fixed time period.  
Time domain response of a multi-tap effect,  
impulse input. Secondary signals are  
reproductions of the original signal, differing in  
amplitude, at nearly the same time.  
DELAY TIME  
IN  
OUT  
Block diagram of a generic  
regenerative digital delay  
circuit.  
FEEDBACK  
REGENERATION  
11  
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GT-80D QuadraDrive  
SOME SUGGESTED SETTINGS:  
SPARKLING CLEAN:  
OUT  
OUT  
FUNKY CLEAN:  
OUT  
OUT  
WARM TUBE:  
OUT  
IN  
BLUESY DIRT:  
OUT  
IN  
12  
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