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Table of contents for the manual
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Page 1
McIntosh Laboratory , Inc. 2 Chambers Street Binghamton, New Y ork 13903-2699 Phone: 607-723-3512 www .mcintoshlabs.com MC302 P ow er A mpl ifier Owner ’ s Manual[...]
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2 The lightning ash with arrowhead, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s en - closure that may be of sufcient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to al[...]
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3 Si x foot , 2 cond uct or shield ed , with t wo 1 /8 inch stere o mini phon e plugs. 2. F or a ddit ional connec tion in form ation, ref er t o the owner’ s ma nual( s ) for any component( s ) c on nected to the MC3 02. 3 . The MC3 02 mutes the sp ea ker output fo r approxi- mately two seconds when f i r st t u r ned on. 4. F or the best p er f[...]
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4 Cable Information, I ntroduction and Per for mance Features X LR Connectors Bel ow is the Pin con f ig u rat ion f or the X LR Balance d Input on the MC3 02. Re fer to t he diag ra m for connec - t ion : P I N 1 : Shield/Grou nd P I N 2: + Input P I N 3 : - Input P ow er Con trol Connector The MC3 02 P ow er Cont rol Input receiv es a n On /O f f[...]
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5 Dimensions The fo llowing d imen sio ns ca n a ssist in dete r m in i ng the best locat ion f or your MC3 02. Dimensions Front V iew of the MC302 Rear V iew of the MC302 Side V iew of the MC302 17- 1/2 " 44.45cm 8- 7/8 " 22.54cm 9- 7/16 " 23.97cm 11 - 3/4 " 29.85cm 16 -13/16 " 42.70cm 20- 3/16 " 51.27cm 3/16 " 0[...]
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6 Installation Installation The MC3 02 can be placed upr i g ht on a table o r she lf, st a ndi ng on its f ou r feet. I t also ca n be cust om in st alled in a piece of fu r nit u re or cabinet of y ou r cho ice. The fo u r feet may be remo ved f rom the bot tom o f t he MC 302 w hen it is custom i nst al led as outli ned bel ow . T he fo u r feet[...]
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7 6.6 Con ne ct the MC302 pow er cord to a l ive A C outlet. Refer to t he rea r pa nel to det er mi ne the cor rec t vo lta ge PO W ER CONTRO L I N receives t u r n On /Off signa ls f rom a McIntosh compone nt. PO W ER CONTRO L OUT 1 and 2 se nd t u r n On /Off signa ls to t he next McIn- tosh Comp onent Unbalance d I Nput (LE FT a nd R IGHT Cha n[...]
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8 How to Co nnec t Lou dsp ea ker C ab le D ist a nc e vs Wi re G aug e Gu id e Loudspe aker Impedance 25 f ee t (7 .6 2 me t er s) or l es s 50 f e et (1 5. 24 m et er s) or l es s 100 f ee t (30. 4 8 m et er s) or l es s 2 Oh ms 12 AW G 10AW G 8 AWG 4 Oh ms 14 AW G 12 AW G 10AW G 8 Oh ms 16A WG 14 AW G 12 AW G 3 . Pre pare t he Loud spea ker Hook[...]
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9 How to Co nnec t Note: The illust rat ion o n sepa rate she et “ Mc1 A ” is conne ct ion s for 8Ω ( ohm s ) Lo ud spe ak er s. If the L oudspe aker’ s i mped a nce is in-b et ween the availab le con nect ions, use t he nearest low er impe da nce con nect ion. Re fer to “Gener al I nfor ma- tion” N ote 4 on page 3 f or add itional in fo[...]
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10 Th is Mc I ntosh MC 302 P ower Amplif ier is desi g ned fo r Loud spea kers w ith a n impe da nce of 2 ohms, 4 ohm s or 8 ohm s. Con nect a single Loudsp ea ker only to the R ight and L eft O ut put T er m i nals. W hen con nect i ng Loudsp ea kers to t he MC 302 i t is ver y imp or t ant to u se cabl es of adequ ate size, so there is l ittle to[...]
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11 Spade L ug or Wire Connect ions : 9 . Con nect the L oudspe aker hook up cables to the MC 302 N egative Output T er mi nal a nd P ositiv e Out put T er mi nal i ndenti f ied as 2 Ω ( ohm s ), 4Ω ( ohm s ) or 8Ω ( ohm s ) con nect ion to match the impe da nce of the Loudspe aker, being caref ul to obser ve the cor re ct polar ities. In ser t t[...]
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12 F ront Panel Display s and Controls Sta ndby Po wer On I nd icator PO W ER Switch T u r ns A C Po wer Of f, Remote, A C Po wer On MET ER Swit ch selects the d isplay modes of the Po wer Out put Met er a nd Meter I llu m i nat ion Meter i nd icates t he R ight Cha n nel O ut put of the amplif ier LED ind icate s when t he LEFT Cha n nel A mplif i[...]
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13 How to Operate How to Operate Input M ode Switch The I nput Mode S witch, wh ich is l ocated on t he Rear Panel o f t he MC 302, allow s sel ect ion o f either the Bal- anced or Unbalanced I nput. Re fer to f igu re 1 1 . P ow er On T o hav e the MC3 02 automatically t u r n On or Off when a control center t u r ns on or off, rotate t he pow e r[...]
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14 Mc Intosh Labor ator y , t he company who intro duced the wor ld ’ s f i r st amplif ier that could be called “H igh F ide lit y” , h as done it again. T he Mc I ntosh engi neer i ng staf f ha s creat ed a pow er a mplif ier w ithout compro- mise, usi ng the most advanced McIntosh circuit design conce pt s. The MC3 02 has a cont inuous ave[...]
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15 considerably from what a loudspea ker requi res. In t he case of more tha n one loudspea ker con necte d in pa ra llel, the load to t he pow er amplif ier may drop to t wo ohms or even less. A pow e r ampli- f ier con nect ed to a load that is low e r th an opti mum , causes more output cu r r ent to f low , which results i n ext ra heat being g[...]
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16 The Auto forme r create s an ideal match bet ween the pow er a mplif ier output st age and the loudspea ker . Ref er to f i g u re 1 6. The re is abso- lutel y no per for - mance l im itat ion with a n Auto fo r mer . Its fre quency re - sponse exceeds t hat o f t he output circu it itself, and extends we ll beyond the audible range . Its distor[...]
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17 Control Center is sw itched On, a ( +5V) signa l oper - ates t he pow e r relay in the MC3 02. The MC3 02 also has t wo remote P ow er Cont rol Out Jacks. The P ow er Control si g nal f rom t hese jacks ar e dela yed by a fra c- tion o f a second so t hat the t u r n on pow er su rge o f t he next pow e r amplif ier occu rs at a later t i me. Th[...]
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18 Specic ations Specic ations P ow er Output Mi ni mu m sine wav e conti nuous av e rage pow er out put per cha n nel, with both cha n nels operat ing is: 300 watt s i nto 2 ohm load 300 watt s i nto 4 ohm load 300 watt s i nto 8 ohm load Output Load Impedance 2, 4 or 8 oh ms Rated Po wer Ban d 20Hz to 20,000H z T otal Har monic Distor t ion[...]
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19 Packing Instructions Packing Instructions In t he event i t is necessa r y to repa ck the equipment for shipment, the equ ipment must be packed exactly as sho w n belo w . It is v er y impor ta nt that t he f ou r plastic feet are at t ached to t he bott om o f the equ ipment. F ou r 1 / 4 - 20x 2- 1/ 4 i nch screws and washer s must be use d to[...]
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The continuous improvement of its products is the policy of McIntosh Laboratory Incorporated who reserve the right to improve design without notice. Printed in the U.S.A. McIntosh Laboratory , Inc. 2 Chambers Street Binghamton, NY 13903 www .mcintoshlabs.com McIntosh Part No. 04123900[...]