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Radio Shack 85 - page 1
Cat. No. 12-1977 OWNER’S MAN UAL Plea se read before using this eq uipment. 85 × 4 Hi g h Power 4-Channel Tru nk Mount Amplifier 12- 19 77 .f m P ag e 1 T ue s day , J ul y 1 3, 19 99 10 :07 AM ...
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Radio Shack 85 - page 2
2 FEA TURES Your Opt imus 8 5 × 4 Hi gh P ower 4- Channel Trun k Mount Am plifier is de- signed to p roduce a tot al of 340 watts to give adde d punch and pow er to your ve hicle’s ex isting ste reo sys- tem . The am plifier produces up t o 85 watts per channel of clean, powerful sound at all audio frequ encies with minimum di s tortion. You can ...
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Radio Shack 85 - page 3
3 Mute Turn On Ci rcuit - elim in ates the irrit a ting thum p n oise that som e ampl ifiers produce when you turn them on. Power Indic a t o r - lights when power is on. Full MOSFET Po wer Supp ly - pro- duce s enough power to supply the main amplifier a nd has a conside r- able amoun t of reserve power for peak “high de mand” s ituations. Sho ...
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Radio Shack 85 - page 4
4 CONTENTS Prep arati on .... .. ... .... ..... ..... ..... .... ..... ..... .. .. ..... ..... ..... .... ..... ..... ..... .. .. ..... ..... ..... .. 5 Choosing a Mounting Locat ion .... . . ............................... . . ........................... 5 Bef ore Y ou Be gin t he Insta lla tion ... .... ..... ..... ..... .... ..... ..... .. ..... ...
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Radio Shack 85 - page 5
5 PREP ARA TION CHOOSING A M OUNTING LO CA TION The ideal location for mounting the a mplifier is in you r vehicle’s trunk. Wherever you decid e to mount it, choose a mounting location that: • Doe s not interfere with the vehicle ’s o peration. • Lets you drill mounting holes without damaging othe r vehicle componen ts. • Allows enough sp ...
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Radio Shack 85 - page 6
6 Cautio n s: • T o prevent damage to your amplifier or aut osound system, you must first connect th e ground, p rimary , and switched powe r wires (as descr ibed in “Connecting G round and Pri mary/Switched Po wer”) before you connect the speakers t o the amplifier . Make t he connections o nly i n the order sho wn. Damage to the amplifier i ...
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Radio Shack 85 - page 7
7 2. Securely c onnec t the supplied dark blue/whit e w ire’ s spade c onnector end to the amplifier ’s REM (r e mote power) terminal. 3. Connec t the dark bl ue/white wire’s other end to y our autosound syst em’s switched power lead using a twist-on terminal conn ector (such as Cat. No. 64-3 057, no t supplie d). Note: I f yo ur aut o soun ...
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Radio Shack 85 - page 8
8 CONNECTING T O YOUR AUTOSOUND SYSTEM Low Le vel In pu t Co nn ec ti o ns You can c o nnect yo ur autosound sy s tem’s low-l evel pho no output j acks to the amplifier’s lo w-level phono input jac k s . For the bes t results, use shielded a udio cables, such as Ca t. No . 42-2368 (not sup plied). Note: For a clean er, less noisy signal transfe ...
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Radio Shack 85 - page 9
9 If your autosound system has four phono output s but you are using onl y two spea kers (front or rear) , connect only the autosound system’s correspond- ing output jacks to the amplifier using audio cab les as f o llows: • front-left to CH1 and front -right to CH2 , or • re a r- l e f t to CH3 and rear-right to CH4 12- 19 77 .f m P ag e 9 T ...
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Radio Shack 85 - page 10
10 If your autosound syst em has only two phono output jacks (left an d right) and you are using four speak ers, use two Y-ada pter audio cables to make the conn ections as follows: Note: F or the be st results, use shielded p hono p lug-to-phono plug Y- adapter audio cables, such as Cat. No. 42-2368 (not s u pplied). • Connect one of the Y- adap ...
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Radio Shack 85 - page 11
11 If your autosound system has o nly two phono output jacks (left and right) and y ou are using only two speak ers, simpl y connect them to the amp lifier ’s correspond ing CH1 and CH2 , or CH3 and CH4, phono ja cks. High -Level In put Co nnecti ons If your autosoiund system ha s only speaker outputs, you can connect them to the ampl ifier’s H ...
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Radio Shack 85 - page 12
12 If your autosound system has f our speaker outpu ts and you are going to use four speakers: Float ing Gr ound Connection Common Gr ound Connection 12-1 977. fm Page 1 2 T ue s day, J uly 13, 1999 10 :07 AM ...
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Radio Shack 85 - page 13
13 If your au tosound system h as only two spea ker outputs and you are go ing to us e four speakers : Fl oati ng G round Connection Common G round Connection 12-1 977. fm Page 1 3 T ue s day, J uly 13, 1999 10 :07 AM ...
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Radio Shack 85 - page 14
14 CONNECTING THE SPEAKERS With the speakers placed i n t heir approxim ate lo cations, run one s p eaker wire from each speaker to the amplifier. We recom mend you us e 16- or 18-gauge marked or c olor-coded wires to help yo u correctly conn ect the spea kers to your amplifier. For the max imum bass respon se and the best o verall performance, kee ...
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Radio Shack 85 - page 15
15 Connect ing Fo ur Spea kers 1. Connec t one e nd of a speaker wire’s mark ed cond uctor to the amplifier ’s CH1 + terminal (f ront-lef t positive). 2. Connec t the unmarked con ductor ’s end to t he amplifier ’ s CH1 - ter m in a l (front-left negat ive). 3. Repeat Steps 1 and 2 to conn ect anoth er speaker wire to the amp lif ier ’s C ...
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Radio Shack 85 - page 16
16 Co nnecting T wo Spe akers ( U nbri dged Con nection ) If you are c onnecting only two speakers , you can connect them to the amplifier’s fro n t ( CH1 and CH2 ) or rear ( CH 3 and CH4 ) speaker terminals. Cautio n : This is an unbridged con nection that produces 85 wat ts per channel. If you do not have high power speakers, use this connectio ...
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Radio Shack 85 - page 17
17 Con n ecting T wo Speak ers (Br idged C onnecti on) If you are connecting onl y two speakers (left and right), you can add (bridge) the power out put o f two channel s (front and back) to produce t he combin ed power of both from each of the two speakers. Caution : Th is is a bridged connection that produces 1 70 watts p er speaker. Us e this co ...
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Radio Shack 85 - page 18
18 Co nnecting T wo Un bridg ed Speake rs and One Unbr idged Subw o ofe r 1. Connect the two spea kers to th e CH1 a nd CH2 terminals (front speakers) or to the CH3 and CH4 terminals (rear spea kers). 2. For an unbridged c onnection, conn ect the subwoofer to the ampl if i er’s CH3 or CH4 terminals (if you used the front spe aker connections in S ...
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Radio Shack 85 - page 19
19 Connect ing T wo Unb ridge d Speaker s and One B ridged Su bwoof er 1. Connec t the tw o speak ers to the CH1 and CH2 t erminals (fron t speakers) or to t he CH3 and CH4 t e rminals (rear speakers). 2. For a bridg ed connection, c onnect the s ubwoofer to the am plifier ’s + CH3 and CH4 + t erminals (if you u sed the front speaker c onnections ...
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Radio Shack 85 - page 20
20 TESTING THE C ONNECT IONS Before y ou perman ently m ount the am pl ifier, connect y our vehi cle battery’s neg- ative ( - ) cabl e, turn your vehicle’s i gnition to ON or ACC, then test the conne c- tions. The amplifier is properly connected to the autosou nd system and speakers if you can verify that t he a mplifier an d t he a uto sound s ...
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Radio Shack 85 - page 21
21 MOUNT ING TH E AMPL IFIE R Before y ou begin m ounting the am plifier, make su re you have t he following sup- plied hardware necessary f or moun ting. • 6 sheet-me tal screws • 6 spring washers • 6 flat washers Then confi rm that the amplifier fits your v e hicle’s m ounting area. Caution: Be careful to not drill int o anythi ng behind ...
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Radio Shack 85 - page 22
22 3. Using the mounting ho les on the amplifier as a gu ide, mark th e locations for the mount ing hol es. 4. D rill 9 / 64 -inch holes in the marked locations, being caref ul not to dam age anything behin d the mounting surface. 5. Attach the a mpl ifier to t he mou nting s urf ace usin g the s upp lied s heet-met al screws and washers. 6. Reconn ...
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Radio Shack 85 - page 23
23 OPER A TION TURNING ON T HE AMPLIF IER The am plifier automatically turns on when ever you turn your vehi cle’s ignition switch to ACC or ON. POWE R lights when the amplifier is o perating. SETTI N G THE LEVEL CONT RO L For th e best performance, you can ad just the lev el of audio s ignals that enter t he ampl ifier by followin g these steps. ...
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Radio Shack 85 - page 24
24 2. T emporarily turn up the autosound s ystem’s volume control t o about one- third of it s fu ll range. Cautio n : Ne v e r turn t h e le v el controls up any farther than you need to get clear sound at two thirds volume maximum . 3. T urn the le ft and right LEVEL controls clock wise u ntil you can hear the sound at a comfortable level. 4. T ...
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Radio Shack 85 - page 25
25 MAIN TENANCE Your Op timus 85 × 4 High Powe r 4 -Channel Trunk Mount Am plifier is an example of superior design and c raftsmanship. The follo wing suggestions will help you care for your (pro duct nam e) so you can e njoy it for years. Keep the amplifier dry. If it get s wet , wipe i t dry immedi ately. Liq- uids mig ht contain mi nerals that ...
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Radio Shack 85 - page 26
26 REPLACING THE FUSES If the am plifier shuts d own, you might need to repl ace t he p ower wi re’s 50-am p tube-type fuse, ei ther of the two 25-am p bl ade-t ype fu ses on the b ac k panel, or all three fus es. Cautio n s: • Do not u se a fuse with ratings other than those specified here. Doing so might dam age your amplifier . • Af t er r ...
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Radio Shack 85 - page 27
27 SPEC IFI CA TIONS 10% T HD Output Power @ 1 4.4 VDC 1 kHz (4 Channel Mod e) ...................... . ....................... . .................... . ....... 85 W ¥ 4 (Bridged M ode) . ................ .. ....... .......... .. ....... ....... .......... .. ....... . 170 Watt s ¥ 2 Frequency Respons e ..................... . ................... ...
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Radio Shack 85 - page 28
RADIO S HACK A Divisi o n of T andy Corpor ation Fort Worth, T exa s 76102 7A5 Printed in T aiw an RADIO SHACK L IMITED W ARRANTY Thi s pr oduc t is warr ant ed a gain st def ects for 1 year fr om d ate of pur chase from Rad io Sh ac k com pa ny -o w ned st o re s an d aut ho riz ed R ad io Shac k franc h is ee s and de al ers . Wit hin thi s pe r ...
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