70-Watt Stereo Graphic Equalizer/Booster (120-1961) Installation Faxback Doc. # 18415 Carefully read the following instructions. If you are unsure about any part of the installation process, we suggest that you have an automotive audio specialist install your equalizer/booster. Improper wiring could damage your vehicle's electrical system. SELECTING SPEAKERS Your speakers must be able to handle the equalizer/booster's maximum output (50 watts per channel). CAUTION: To prevent damage to your equalizer/booster or radio/cassette player, be sure that you note the following. If you install four 8-Ohm speakers, two 8-Ohm speakers, or two 4-Ohm speakers, set the 4-Ohm SP/8-Ohm SP switch to 8 Ohm SP. If you install four 4-Ohm speakers, set the 4 Ohm SP/8 Ohm SP switch to 4 Ohm SP. IN-LINE FUSES Your equalizer/booster comes with two in-line fuses-Fuse B (rated at 5 Amps) and Fuse A (rated at 15 Amps). CAUTION: If the radio/cassette player's in-line fuse has a rating other than 5 Amps, replace Fuse B with a fuse that has the same rating as the in-line fuse. Using two fuses with different ratings could damage the radio/cassette player. If you decrease the rating of Fuse B, you must decrease the rating of Fuse A an equal amount. Fuse A's rating should be 10 plus the rating of Fuse B. For example, if you replace Fuse B with a 2-Amp fuse, replace Fuse A with a 12-Amp fuse. If a fuse is not available at a certain rating, you can temporarily use a fuse with a lower Amp rating. CONNECTING POWER AND SPEAKERS This equalizer/booster is designed for a 12-Volt DC, negative-ground electrical system. Most vehicles have this type system, but if your vehicle does not or you are unsure, we suggest that you have the equalizer/ booster professionally installed. CAUTION: If your radio/cassette player does not have a compatible electrical plug, your local Radio Shack store can provide the necessary plug or adapter. Be sure you have the necessary plug or adapter before you connect the equalizer/booster's power. Any alteration of your equalizer/booster voids its warranty. This equalizer/booster has been designed to connect to units that use BTL (Balanced Transformer-Less) circuitry or to a common-ground type unit. Before you connect your equalizer/booster: Disconnect the radio/cassette player's power cable connector and plug it into the equalizer/booster's connector. If your radio/cassette player requires a connector different from the one on your equalizer/booster, you can Have a professional install the equalizer/booster. Obtain Radio Shack's universal car stereo cable set (Cat. No. 270-017) and make the connections yourself. CAUTION: Improper connections can damage your equalizer/booster, radio/ cassette player, or your vehicle's electrical system. To connect your equalizer/booster to an existing audio system, see diagram "A" in Faxback Doc.#18151: 1. Connect the equalizer/booster's five-pin plug to the radio/cassette player's five-pin jack. 2. Connect the equalizer/booster's thick red wire with the in-line fuse to a 12-Volt DC power source. 3. Connect the equalizer/booster's black ground wire to a clean, metal part of your vehicle's chassis (usually under a bolt in a metal brace beneath the dash). 4. Connect the front speakers' five pin plug to the equalizer/booster's front-speaker five-pin jack. NOTE: To get the maximum benefit from your equalizer/booster, you can connect a second pair of speakers. Connect their five-pin plug to the equalizer/booster's rear speaker five-pin jack. 5. Double-check all connections. To connect your equalizer/booster using RCA-type phono connectors, see diagram "B" in Faxback Doc.#18151: 1. Using a twin shielded audio cable with two phono plugs at each end, connect your radio/cassette player's output to your equalizer/booster's AUX L (Left) and AUX R (Right) jacks. 2. Install the supplied 5-pin harness adapter between the equalizer/ booster's 5-pin plug and the radio/cassette player's 5-pin jack. 3. Connect the equalizer/booster's thick red wire with the in-line fuse to a source of 12-Volt DC power. 4. Connect the equalizer/booster's thick black ground wire to a clean, metal part of your vehicle's chassis (usually under a bolt in a metal brace beneath the dash). 5. Connect the front speakers' five-pin plug to the equalizer/booster's front-speaker five-pin jack. CAUTION: To prevent damage to your speakers, use a separate wire to connect each speaker terminal. Do not use a common wire to join two speakers' negative (-) terminals. NOTE: To get the maximum benefit from your equalizer/booster, you can connect a second pair of speakers. Connect their five-pin plug to the equalizer/booster's rear speaker five-pin jack. 6. Double-check all connections. MOUNTING THE EQUALIZER/BOOSTER You can install your equalizer/booster using the supplied mounting bracket. We suggest that you complete the speaker and power connections and be sure that the equalizer/booster operates properly before you mount it. Select a mounting location below the dash that Is close enough to the radio/cassette player to allow a proper connection. Is close enough to a 12V DC power source to allow a proper connection. Does not interfere with the safe operation of the vehicle. Is not directly in front of a heating vent. Allows the drilling of mounting holes without damaging wires or other vehicle components. Allows enough leg room for passengers. Allows convenient and safe routing of wires. Gives you easy access to all the equalizer/booster's controls. Install the equalizer/booster using the provided bracket, washers, and screws. 1. Mark the mounting holes, using the bracket as a template. 2. Drill the marked holes, being careful not to drill into existing wires or other vehicle components. 3. Mount the bracket using the two large washers and two self-tapping screws. 4. Mount the equalizer/booster in the bracket using the four smaller washers, the two rubber washers, and the four hex bolts. (CS 11/21/95)