- DL manuals
- Radio Shack
- Amplifier
- 12-1977
- Owner's Manual
Radio Shack 12-1977 Owner's Manual
Summary of 12-1977
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: Features
2 features your optimus 85 × 4 high power 4- channel trunk mount amplifier is de- signed to produce a total of 340 watts to give added punch and power to your vehicle’s existing stereo sys- tem. The amplifier produces up to 85 watts per channel of clean, powerful sound at all audio frequencies with ...
Page 3
3 mute turn on circuit - eliminates the irritating thump noise that some amplifiers produce when you turn them on. Power indicator - lights when power is on. Full mosfet power supply - pro- duces enough power to supply the main amplifier and has a consider- able amount of reserve power for peak “hig...
Page 4: Contents
4 contents preparation ..................................................................................................... 5 choosing a mounting location .................................................................. 5 before you begin the installation ............................................
Page 5: Preparation
5 preparation choosing a mounting location the ideal location for mounting the amplifier is in your vehicle’s trunk. Wherever you decide to mount it, choose a mounting location that: • does not interfere with the vehicle’s operation. • lets you drill mounting holes without damaging other vehicle com...
Page 6
6 cautions: • to prevent damage to your amplifier or autosound system, you must first connect the ground, primary, and switched power wires (as described in “connecting ground and primary/switched power”) before you connect the speakers to the amplifier. Make the connections only in the order shown....
Page 7
7 2. Securely connect the supplied dark blue/white wire’s spade connector end to the amplifier’s rem (remote power) terminal. 3. Connect the dark blue/white wire’s other end to your autosound system’s switched power lead using a twist-on terminal connector (such as cat. No. 64-3057, not supplied). N...
Page 8
8 connecting to your autosound system low level input connections you can connect your autosound system’s low-level phono output jacks to the amplifier’s low-level phono input jacks. For the best results, use shielded audio cables, such as cat. No. 42-2368 (not supplied). Note: for a cleaner, less n...
Page 9
9 if your autosound system has four phono outputs but you are using only 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...
Page 10
10 if your autosound system has only two phono output jacks (left and right) and you are using four speakers, use two y-adapter audio cables to make the connections as follows: note: for the best results, use shielded phono plug-to-phono plug y- adapter audio cables, such as cat. No. 42-2368 (not su...
Page 11
11 if your autosound system has only two phono output jacks (left and right) and you are using only two speakers, simply connect them to the amplifier’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 c...
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
14 connecting the speakers with the speakers placed in their approximate locations, run one speaker wire from each speaker to the amplifier. We recommend you use 16- or 18-gauge marked or color-coded wires to help you correctly connect the speakers to your amplifier. For the maximum bass response an...
Page 15
15 connecting four speakers 1. Connect one end of a speaker wire’s marked conductor to the amplifier’s ch1 + terminal (front-left positive). 2. Connect the unmarked conductor’s end to the amplifier’s ch1 - terminal (front-left negative). 3. Repeat steps 1 and 2 to connect another speaker wire to the...
Page 16
16 connecting two speakers (unbridged connection) if you are connecting only two speakers, you can connect them to the amplifier’s front ( ch1 and ch2 ) or rear ( ch3 and ch4 ) speaker terminals. Caution: this is an unbridged connection that produces 85 watts per channel. If you do not have high pow...
Page 17
17 connecting two speakers (bridged connection) if you are connecting only two speakers (left and right), you can add (bridge) the power output of two channels (front and back) to produce the combined power of both from each of the two speakers. Caution: this is a bridged connection that produces 17...
Page 18
18 connecting two unbridged speakers and one unbridged subwoofer 1. Connect the two speakers to the ch1 and ch2 terminals (front speakers) or to the ch3 and ch4 terminals (rear speakers). 2. For an unbridged connection, connect the subwoofer to the amplifier’s ch3 or ch4 terminals (if you used the f...
Page 19
19 connecting two unbridged speakers and one bridged subwoofer 1. Connect the two speakers to the ch1 and ch2 terminals (front speakers) or to the ch3 and ch4 terminals (rear speakers). 2. For a bridged connection, connect the subwoofer to the amplifier’s + ch3 and ch4 + terminals (if you used the f...
Page 20
20 testing the connections before you permanently mount the amplifier, connect your vehicle battery’s neg- ative ( - ) cable, turn your vehicle’s ignition to on or acc, then test the connec- tions. The amplifier is properly connected to the autosound system and speakers if you can verify that the am...
Page 21
21 mounting the amplifier before you begin mounting the amplifier, make sure you have the following sup- plied hardware necessary for mounting. • 6 sheet-metal screws • 6 spring washers • 6 flat washers then confirm that the amplifier fits your vehicle’s mounting area. Caution: be careful to not dri...
Page 22
22 3. Using the mounting holes on the amplifier as a guide, mark the locations for the mounting holes. 4. Drill 9 / 64 -inch 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...
Page 23: Operation
23 operation turning on the amplifier the amplifier automatically turns on whenever you turn your vehicle’s ignition switch to acc or on. Power lights when the amplifier is operating. Setting the level control for the best performance, you can adjust the level of audio signals that enter the amplifi...
Page 24
24 2. Temporarily turn up the autosound system’s volume control to about one- third of its full range. Caution: never turn the level controls up any farther than you need to get clear sound at two thirds volume maximum. 3. Turn the left and right level controls clockwise until you can hear the sound...
Page 25: Maintenance
25 maintenance your optimus 85 × 4 high power 4-channel trunk mount amplifier is an example of superior design and craftsmanship. The following suggestions will help you care for your (product name) so you can enjoy it for years. Keep the amplifier dry. If it gets wet, wipe it dry immediately. Liq- ...
Page 26
26 replacing the fuses if the amplifier shuts down, you might need to replace the power wire’s 50-amp tube-type fuse, either of the two 25-amp blade-type fuses on the back panel, or all three fuses. Cautions: • do not use a fuse with ratings other than those specified here. Doing so might damage you...
Page 27: Specifications
27 specifications 10% thd output power @ 14.4 vdc 1 khz (4 channel mode) ........................................................................... 85 w ¥ 4 (bridged mode) ........................................................................170 watts ¥ 2 frequency response .........................
Page 28
Radio shack a division of tandy corporation fort worth, texas 76102 7a5 printed in taiwan radio shack limited warranty this product is warranted against defects for 1 year from date of purchase from radio shack company-owned stores and authorized radio shack franchisees and dealers. Within this peri...