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Adcom GFA7807 manual

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Table of contents for the manual

  • Page 1

    OW NE R’ S MA NU AL G F A - 7 8 0 5 & G F A - 7 8 0 7 Mu lt i- ch an ne l Hi gh -C ur re nt P owe r A mp li e rs[...]

  • Page 2

    W E L C O M E 2 Dear fe llow ADCOM produc t owner , W elcome to the ADCOM fami ly! For more than twenty years, A DCOM products hav e delive red excelle nt perform ance and value for custom ers around the wor ld. Our products are desig ned by our experienced and de manding en gineering team, bui lt to the highest standards in our factory , and sold [...]

  • Page 3

    T A B L E O F C O N T E N T S WELCOME ........................................ 2 SAFETY INFORMA TION ........................... 4 DESCRIPTION OF UNIT GF A-7805 FEA TURES .............................. 5 GF A-7807 FEA TURES .............................. 5 W ARRANTY INFORMA TION ......................... 5 INST ALLA TION & HOOKUP UNP ACKING THE[...]

  • Page 4

    THE FOLLOWING PRECAUTIONS AND SAFETY INSTRUCTIONS ARE REQUIREMENTS OF UL AND CSA SAFETY REGULATIONS Warning: To reduce the risk of re or electric shock, do not expose this unit to rain or moisture. The grap hic symbol of a lightni ng ash with an arro w poin t with in a t riangl e sign ies t hat th ere is da ngerou s volta ge with in the u [...]

  • Page 5

    GF A-7805 FEA TURES • P recision-matched devices used throughout the signal path • 112,000 µF of power supply-lter capacitance to optimize transient response • Independent power supplies for each channel • Fewer gain stages improve signal reproduction accuracy • Custom toroidal power transformer provides better regulation and greater [...]

  • Page 6

    INTROD UCTION Congratul ations on your decision to purc hase the GF A-7805 or GF A-78 07 multichannel power ampl ier . The GF A-7805 and GF A-7807 have been designed to be high performance and musically accurate in a congurati on specicall y designed to integrate with any audio pre-am plier . Y ou have made a wise choice that will rewar[...]

  • Page 7

    G F A 7807 distortion alert > LF C RF RS R B thermal protection > LB L S GF A-78 07 FRO NT P AN EL ( 6 ) ( 8 ) ( 9 ) ( 7 ) GF A-78 07 REA R P ANEL ( 2 ) ( 1 ) ( 5 ) ( 4 ) ( 3 ) (1) Inp ut J acks (2) Out put Bin ding P osts (3) I2V DC T r igge r (4) AC F use (5) AC P owe r Co rd (6) On/ Off Swit ch (7) P owe r LE D (8) T herm al P rote ctio n [...]

  • Page 8

    8 DESC RIPTIO N OF U NIT : REA R P ANEL (1) Inputs The GF A- 7805 a nd GF A 78 07 ha ve bot h bal anced and u nbal- anc ed inp uts f or ea ch cha nnel. Th e unb alance d con necti on is made v ia th e gol d plat ed RC A ja ck and the balan ced co n- nec tion i s mad e via the X LR in put c onnect ion. Each channe l als o has a swi tch w hich s elec[...]

  • Page 9

    9 autom atically a nd normal operation will resu me. If you are t o avoid tr ipping the thermost at in the transforme r contin ually , you must reduce t he sound l evel deman ds, correc t the loa d impedanc e of the loudspeake rs, or bot h. (8) Thermal Protec tion LE Ds The GF A-7805/7 807 are pr ovided wi th a therm al protect ion circui t which w[...]

  • Page 10

    Model: GFA-7807 Power Amplifier Power consumption (max): XXXX W serial number CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN WARNING: To reduce the risk of fire or electric shock, do not expose this appliance to rain or moisture. AVIS: Risque de choc electrique- ne pas ouvrir. ATTENTION: Pour eviter tout risque de feu ou choc electrique, ne pas exposer[...]

  • Page 11

    11 CONNEC TING T HE GF A-7805 /7807 T O YOUR SPEAKE RS When connecting the amplier to the loudspea ker , it is vital to maintain proper polarity (positive to positive, negative to negative). On the GF A-7805/78 07, the posit ive term inal is color coded RED and labeled “+,” and the negative is color coded BLACK and labeled “-”. The posit[...]

  • Page 12

    RESO L VING P ROBLEMS Use th e chart b elow to so lve commo n situatio ns that do n’t requi re profess ional att ention. If the step s stated i n POSSIBLE SOLUT ION do not resolve your probl em, then p lease con tact your ADCOM Deal er or cal l the ADCOM Cu stomer Ser vice Depart ment. Any pro blems not covered h ere should be brough t to the att[...]

  • Page 13

    For Fax inquires, please include a return Fax number for the reply. When calling or writing about your GF A-7805/7807, 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 u[...]

  • Page 14

    GF A-7805 SPECIFICA TIONS Power Rating (To EIA/CEA-490-A Requirements) 300 Watts continuous average power per channel into 8 ohms at any frequency between 20Hz and 20kHz with all channels driven at less than 1.00% THD. 450 Watts continuous average power per channel into 4 ohms at any frequency between 20Hz and 20khz with all channels driven at less[...]

  • Page 15

    GF A-7807 SPECIFICA TIONS Power Rating (To EIA/CEA-490-A Requirements) 300 Watts continuous average power per channel into 8 ohms at any frequency between 20Hz and 20kHz with all channels driven at less than 1.00% THD. 450 Watts continuous average power per channel into 4 ohms at any frequency between 20Hz and 20khz with all channels driven at less[...]

  • Page 16

    ADCOM A division of Klein T echnology Group, LLC 8551 East Anderson Drive, Suite 105 Scottsdale, Arizona 85255 V oice: (480) 607-2277 Fax: (480) 348-9876 http://www .adcom.com GF A7805_07_manual_v1[...]