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Adcom GFA-555se - page 1
OWNER’S MANUAL GF A-555se High-Current Power Amplifi er ...
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Adcom GFA-555se - page 2
2 Congratu lations on your pur chase of the Adcom GF A- 5 55se Y o u h ave ma de a w i s e c ho ice th at w ill re wa rd y o u w ith except io nally acc ur ate mu si cal s o un d rep ro d u c tio n for yea rs to come . T o rea liz e the fu ll po ten tial o f your new ampl i fi er , pl ease re ad these opera ting and i nstal lation inst ructions th ...
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Adcom GFA-555se - page 3
T ABLE OF CONTENTS LETTER FROM THE ADCOM TEAM ................. 2 SAFETY INFORMA TION ............................ 4 DESCRIPTION OF UNIT GF A-555se FEA TURES ............................. 5 W ARRANTY INFORMA TION ......................... 5 INST ALLA TION & HOOKUP UNP ACKING THE GF A-555se ........................6 INST ALLING THE GF A-555se .. ...
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Adcom GFA-555se - page 4
• Read all the saf et y and oper ating instructio ns before con- nec ting or using this unit. • Retain this notic e and the owner’ s manual for f uture refer - ence . • All warnings on the u nit and in i ts op erating instru ctions should be adhere d to. • All operating and use instr uc tions should be followed. • Do not us e this unit ...
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Adcom GFA-555se - page 5
GF A-555se FEA TURES • P recision-matched devices used throughout the signal path. • 60,000 μ F of power supply- fi lter capacitance for greater reserve capacity . • Independent power supplies for each channel. • Fewer gain stages improve signal reproduction accuracy . • Custom toroidal power transformer provides better regulation and g ...
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Adcom GFA-555se - page 6
INTRODUCTION Congratulations on your decision to purchase the GF A-555se power ampli fi er . By use of updated components in the classic ADCOM GF A-555 design, we have reestablished our heritage of high performance and audiophile quality at the greatest possible value. Y ou have made a wise choice that will reward you for years to come with except ...
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Adcom GFA-555se - page 7
7 CONNECTING THE GF A-555se When connecting the ampli fi er to the loudspeaker , it is vital to maintain proper polarity (positive to positive, negative to negative). On the GF A-555se , the positive terminal is color coded RED and labeled “+”, and the negative is color coded BLACK and labeled “-”. The positive terminal on the speaker will ...
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Adcom GFA-555se - page 8
T o set the ampli fi er in bridged mono operation, fl ip the STEREO/BRIDGED input switch into the BRIDGED position. When in the bridged mono mode, input to the ampli fi er is made only through the LEFT input jack. The connection to the RIGHT input jack should be removed since the right-channel input portion of the ampli fi er is inoperative. On ...
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Adcom GFA-555se - page 9
thermal protection channel model GFA-555se power L R high current power amplifier instantaneous distortion alert FRONT P ANEL ( 7 ) ( 10 ) ( 9 ) ( 8 ) REAR P ANEL ( 3 ) ( 1 ) ( 5 ) ( 4 ) ( 2 ) (1) Inputs (unbalanced) (2) Inputs (balanced) (3) Output Binding P osts (4) AC Fuse (5) AC P ower Cord (6) Mode Switches (7) On/Off Switch (8) P ower LED (9) ...
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Adcom GFA-555se - page 10
10 DESCRIPTION OF UNIT : REAR P ANEL (1) Inputs (unbalanced) The audio inputs for the GF A-555se are through high-quality , gold-plated RCA jacks to minimize high-frequency losses, noise, etc. They will accept standard RCA-type plugs, one for each channel; Left and Right. T o insure that the performance designed into the amp is preserved, you shoul ...
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Adcom GFA-555se - page 11
11 (6) Mode Switches For normal stereophonic mode of operation, the STEREO/BRIDGED input switch should be set to STEREO. Otherwise, the ampli fi er will operate in the bridged mono input mode by which you will amplify only the left channel through both outputs of the ampli fi er . The BALANCED/UNBALANCED selector switches should be set to accommo ...
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Adcom GFA-555se - page 12
12 RESOL VING PROBLEMS Use the chart below to solve common situations that don’t require professional attention. If the steps stated in POSSIBLE SOLUTION do not resolve your problem, then please contact your ADCOM Dealer or call the ADCOM Customer Service Department. Any problems not covered here should be brought to the attention of your ADCOM D ...
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Adcom GFA-555se - page 13
For Fax inquires, please include a return Fax number for the reply. When calling or writing about your GF A-555se, be sure to note and refer to its serial number as well as the date of purchase and the dealer from whom it was purchased. In any communications to us, please include a daytime phone number where we may reach you. In the event the unit ...
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Adcom GFA-555se - page 14
GF A-555se SPECIFICA TIONS Power Rating (To FTC Requirements) 200 Watts continuous average power into 8 ohms at any frequency between 20Hz and 20kHz with both channels driven at less than 0..04% THD. 300 Watts continuous average power into 4 ohms at any frequency between 20Hz and 20khz with both channels driven at less than 0.04% THD. * 600 Watts c ...
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Adcom GFA-555se - page 15
Input Sensitiv ity 200 watts into 8 ohms ................................................................ 1.75V rms 1 watt into 8 ohms .................................................................. 130mV rms Damping Factor 2OHz to 2OkHz ......................................................................... ≥ 900 Rise Time 5kHz, 120V peak-t ...
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Adcom GFA-555se - page 16
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