Radio Shack 12-1977, Owner'S Manual

Page 1: ...Cat No 12 1977 OWNER S MANUAL Please read before using this equipment 85 4 High Power 4 Channel Trunk Mount Amplifier 12 1977 fm Page 1 Tuesday July 13 1999 10 07 AM ...

Page 2: ...d minimum cor rosion to provide the highest signal transfer and lowest sound distortion Input Level Controls let you adjust the level of the audio signals that en ter the amplifier Automatic Power Switching auto matically turns on off the amplifier when you turn on off your autosound system Bridging Capability lets you com bine the amplifier s four 85 watt channels so you can use the system with o...

Page 3: ... to turn off the amplifier Important Be sure your speakers can handle 340 watts of power 170 watts per channel if you connect the autosound system to one pair of speakers or 85 watts per channel if you connect the autosound system to two pairs of speakers Each speaker must have an impedance of at least 4 ohms Your local Radio Shack store carries a full line of speakers Note If the connectors on yo...

Page 4: ...onnection 16 Connecting Two Speakers Bridged Connection 17 Connecting Two Unbridged Speakers and One Unbridged Subwoofer 18 Connecting Two Unbridged Speakers and One Bridged Subwoofer 19 Testing the Connections 20 Mounting the Amplifier 21 Operation 23 Turning On the Amplifier 23 Setting the Level Control 23 Using the Frequency Crossover 24 X Over Freq On off Switch 24 X Over Freq Control 24 Maint...

Page 5: ...he instructions in this owner s manual You should be able to answer all of these questions about your vehicle s electrical and sound systems Does my vehicle have a 12 volt negative ground system If it does not you cannot use this amplifier Which of the amplifier s wires is the power wire How do I connect a wire to the fuse box Which amplifier terminals are line level inputs which are speaker level...

Page 6: ...akers can handle 85 watts per channel if you connect the autosound system to two pairs of speakers or 170 watts per channel if you connect the autosound system to only one pair of speakers Each speaker must have an impedance of at least 4 ohms Your local Radio Shack store carries a full line of speakers to choose from CONNECTING GROUND AND PRIMARY SWITCHED POWER 1 To prevent damage to your amplifi...

Page 7: ... two GND terminals 5 Securely connect the black wire s eyelet terminal to a nearby metal ground such as a bolt attached to a part of the vehicle s chassis Note Be sure the bolt is not insulated from the chassis by a plastic part or other insulating material 6 Connect the red wire s eyelet spade terminal end to the amplifier s two 12V terminals 7 Remove the nut from the positive cable s terminal bo...

Page 8: ...isy signal transfer between your autosound system and the amplifier the amplifier s low input phono jacks are gold plated 1 Temporarily place the amplifier as close as possible to the selected mount ing location 2 If your autosound system has four phono outputs and you are using four speakers connect the autosound system to the amplifier using audio cables as follows front left to CH1 front right ...

Page 9: ...ly two speakers front or rear connect only the autosound system s correspond ing output jacks to the amplifier using audio cables as follows front left to CH1 and front right to CH2 or rear left to CH3 and rear right to CH4 12 1977 fm Page 9 Tuesday July 13 1999 10 07 AM ...

Page 10: ... Y adapter s double phono plug ends to the amplifier s CH1 phono jack Connect the other double phono plug end to the amplifier s CH3 phono jack Connect the single phono plug end to the autosound system s left output jack Connect one of the other Y adapter s double phono plug ends to the amplifier s CH2 phono jack Connect the other double phono plug end to the amplifier s CH4 phono jack Connect the...

Page 11: ...s corresponding CH1 and CH2 or CH3 and CH4 phono jacks High Level Input Connections If your autosoiund system has only speaker outputs you can connect them to the amplifier s HIGH INPUT CH4 CH3 and HIGH INPUT CH2 CH1 sockets using the floating ground connection or the common ground connection method 12 1977 fm Page 11 Tuesday July 13 1999 10 07 AM ...

Page 12: ...12 If your autosound system has four speaker outputs and you are going to use four speakers Floating Ground Connection Common Ground Connection 12 1977 fm Page 12 Tuesday July 13 1999 10 07 AM ...

Page 13: ...13 If your autosound system has only two speaker outputs and you are going to use four speakers Floating Ground Connection Common Ground Connection 12 1977 fm Page 13 Tuesday July 13 1999 10 07 AM ...

Page 14: ... chassis ground Note Speaker wires have two conductors Color coded wires have a stripe run ning down one of the conductors or different colored insulation for each conduc tor Your local Radio Shack store has a wide selection of speaker wire to choose from Preparing the Speaker Wires 1 Separate each speaker wire s two conductors at both ends for a length of about 4 inches 2 Strip the insulation fro...

Page 15: ...t Steps 1 and 2 to connect another speaker wire to the amplifier s CH2 front right terminals 4 Repeat Steps 1 3 to connect speaker wires to the amplifier s CH3 rear left and CH4 rear right terminals 5 Connect the other ends of the four speaker wires so CH1 connects to the front left speaker CH2 to the front right speaker CH3 to the rear left speaker and CH4 to the rear right speaker 12 1977 fm Pag...

Page 16: ... a speaker wire s marked conductor to the amplifier s CH1 front left positive or CH3 rear left positive terminal 2 Connect the unmarked conductor s end to the amplifier s CH1 front left negative or CH3 rear left negative terminal 3 Repeat Steps 1 and 2 to connect speaker wires to the amplifier s CH2 and CH2 front right or CH4 and CH4 rear right terminals 4 Connect the other ends of the speaker wir...

Page 17: ... terminal 2 Connect the unmarked conductor s end in the same speaker wire to the amplifier s CH2 Bridged terminal and the other end to the left speaker s negative terminal 3 Connect one end of a second speaker wire s marked conductor to the amplifier s CH3 Bridged terminal and the other end to the right speaker s negative terminal 4 Connect the unmarked conductor s end in the same speaker wire to ...

Page 18: ...ier s CH3 or CH4 terminals if you used the front speaker connections in Step 1 or the CH1 or CH2 terminals if you used the rear speaker connections in Step 1 3 Push in X OVER FREQ so you can later adjust the amplifier s sound to com pensate for your vehicle s acoustics see Using the Frequency Cross over 4 Press and release the left and right BRG ST Bridged Stereo switches to make sure they are off...

Page 19: ...peaker connections in Step 1 or the CH1 and CH2 terminals if you used the rear speaker connec tions in Step 1 3 Push in X OVER FREQ so you can later adjust the amplifier s sound to com pensate for your vehicle s acoustics see Using the Frequency Cross over 4 Press and release the right BRG ST Bridged Stereo switch to make sure it is off 5 Push in the left BRG ST Bridged Stereo switch to the BRG po...

Page 20: ...he autosound system turn on properly and the speakers sound is clear and unmuffled If you cannot quickly verify that all components operate properly immediately turn off your vehicle s ignition Then disconnect your vehicle battery s nega tive cable and recheck your connections Once you verify that all components operate properly mark the connections to insure easy identification of each wire then ...

Page 21: ...m that the amplifier fits your vehicle s mounting area Caution Be careful to not drill into anything behind the mounting surface 1 Temporarily disconnect your vehicle battery s negative cable again 2 To make mounting more convenient temporarily disconnect the amplifier s connections ground primary power remote power your vehicle stereo s input and speakers 12 1977 fm Page 21 Tuesday July 13 1999 1...

Page 22: ...ch holes in the marked locations being careful not to damage anything behind the mounting surface 5 Attach the amplifier to the mounting surface using the supplied sheet metal screws and washers 6 Reconnect the wiring 7 Reconnect your vehicle battery s negative cable 12 1977 fm Page 22 Tuesday July 13 1999 10 07 AM ...

Page 23: ...protection system lowers the amplifier s output power until it cools down The sound distorts if any output channel shorts Turn off the amplifier and try to locate the short To prevent draining the vehicle s battery do not operate the amplifier using the ignition switch s ACC position for too long after turning off the vehicle s ignition 1 Turn both LEVEL MIN MAX controls fully counterclockwise to ...

Page 24: ...l you want the autosound system to produce 6 Adjust the autosound system s volume control to a comfortable listening level USING THE FREQUENCY CROSSOVER X OVER FREQ On Off Switch To use the amplifier s crossover function with a subwoofer push in X OVER FREQ to On To use the amplifier without a subwoofer push and release X OVER FREQ to Off X OVER FREQ Control When you push in X OVER FREQ to On the ...

Page 25: ...d store the amplifier only in normal temperature environ ments Temperature extremes can shorten the life of electronic devices and distort or melt plastic parts Keep the amplifier away from dust and dirt which can cause pre mature wear of parts Wipe the amplifier with a damp cloth occasionally to keep it look ing new Do not use harsh chemicals cleaning solvents or strong detergents to clean the am...

Page 26: ...osound system then disconnect the cable from your vehicle bat tery s negative terminal Replacing the Tube Type Fuse 1 Grasp the two ends of the power wire s fuse holder and twist one of them counterclockwise then pull the ends apart 2 Insert a new 50 amp tube type fuse into the longer of the fuse holder s ends then grasp the fuse holder s two ends push them in and twist them clockwise Replacing a ...

Page 27: ...kOhms High Input 100 Ohms Input Sensitivity for 10 THD Output Power Low Input 250 mV Maximum Current Draw 50 A Dimensions 25 8 1013 16 163 16 Inches HWD 6 7 27 5 41 1 cm Net Weight 17 2 lbs 7 8 kg Specifications are typical individual units might vary Specifications are subject to change and improvement without notice 12 1977 fm Page 27 Tuesday July 13 1999 10 07 AM ...

Page 28: ...ot cover transportation costs Nor does it cover a product subjected to misuse accidental damage alteration or improper installation EXCEPT AS PROVIDED HEREIN RADIO SHACK MAKES NO EXPRESS WARRAN TIES AND ANY IMPLIED WARRANTIES ARE LIMITED IN DURATION TO THE DURA TION OF THE WRITTEN LIMITED WARRANTIES CONTAINED HEREIN Some states do not permit limitation or exclusion of implied warranties therefore ...