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GT-80D QuadraDrivetm 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 features four separate, footswitchable Gain controls, with your choice of Tube or Solid State preamps for either the Clean or the Overdrive channel.
GT-80D QuadraDrivetm ABOUT THE GT-80D: The Crate GT-80D QuadraDrivetm with Digital Sound Processing is truly unique and versatile, offering 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.
GT-80D QuadraDrivetm 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 control over the compression and overdrive characteristics of the GT-80DSP’s input tubes.
GT-80D QuadraDrivetm 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.
GT-80D QuadraDrivetm 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 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.
GT-80D QuadraDrivetm THE GT-80D REAR PANEL: 100/120VAC - 2 1/2A NORMAL BLOW 220-240VAC - 1 1/2A NORMAL BLOW CHANNEL/ TUBE CAUTION CAUTION: TO REDUCE THE RISK OF FIRE, REPLACE FUSE WITH SAME TYPE AND RATING. 26 ATTENTION: RISK OF ELECTRIC SHOCK – DO NOT OPEN RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR UTILISER UN FUSIBLE DE RECHARGE DE MEME TO REDUCE THE RISK OF ELECTRIC SHOCK, TYPE. AVIS: DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. 27 CAUTION: CHASSIS SURFACE HOT.
GT-80D QuadraDrivetm 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.
GT-80D QuadraDrivetm 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 OFF NONE Bypass—no signal processing occurs. 1 SMALL ROOM, BRIGHT SMALL REVERB 8’ x 8’ empty room with hardwood floors. 2 SMALL ROOM, DARK SMALL REVERB 8’ x 8’ carpeted room with up to four people.
GT-80D QuadraDrivetm 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.
GT-80D QuadraDrivetm ABOUT THE DIGITAL SOUND PROCESSOR: Block Diagrams: Sound Amplitude TYPICAL REVERB RESPONSE TO AN IMPULSE REVERSE REVERB EFFECT 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. PREDELAY REVERB (DECAY) TIME Time domain response of a typical reverb, impulse input.
GT-80D QuadraDrivetm SOME SUGGESTED SETTINGS: SPARKLING CLEAN: OUT OUT FUNKY CLEAN: OUT OUT WARM TUBE: OUT IN BLUESY DIRT: OUT IN 12
GT-80D QuadraDrivetm WARM TUBE CRUNCH: IN IN HOT TUBE LEAD: IN IN SOLID STATE LEAD: IN OUT SOLID STATE CRUNCH: IN OUT 13
GT-80D QuadraDrivetm SYSTEM BLOCK DIAGRAM: CHANNEL TUBE CLEAN GAIN LED LED LED CLEAN TONES & MASTER TUBE TUBE 0VERDRIVE GAIN LOW MID HIGH MASTER LED INPUT DSP LEVEL S.S. CLEAN GAIN MODE LED LED OVERDRIVE TONES & MASTER SOLID STATE LED S.S.
GT-80D QuadraDrivetm
GT-80D QuadraDrivetm TECHNICAL SPECIFICATIONS: Output Power Rating 80 watts RMS @ 5% THD 8 ohm load, 120 VAC Gain 88dB, tones @ “5” @ 1kHz Tone Control Range Overdrive Channel Low Mid High Clean Channel Low Mid High 24dB range @ 100Hz 10dB range @ 1kHz 20dB range @ 5kHz 23dB range @ 100Hz 14dB range @ 800Hz 30dB range @ 10kHz Signal To Noise Ratio Overdrive Channel Solid State Tube Clean Channel Solid State Tube 61dB 57dB 81dB 72dB Input Impedance 1M ohm Maximum Signal Accepted 3V peak to peak D
