4Channel Musical High Performance Flush-Mount Amplifier MODEL: 600.S Owner’s Manual Dear customer, Selecting fine audio equipment, such as the unit you have just purchased, is only the beginning of your musical enjoyment. Now is the time to consider how to maximize the fun and excitement your equipment has to offer. AUTOTEK and the Electronic Industry Associations Consumer Electronic Group want you to get the most out of your equipment by playing it at a safe level, a level that lets the sound come through loud and clear without annoying blaring distortion; most importantly, without affecting your sensitive hearing. Sound can be deceiving. Over time your hearing "comfort level" adapts to higher volumes of sound, what may have sounded "normal" can actually be too loud and harmful to your hearing. Guard against this by setting your equipment at a safe level BEFORE your hearing adapts. To establish a "safe level": • Start you volume control at a low setting. • Slowly increase the sound until you can hear it comfortably and clearly, and without distortion. • Once you have established a comfortable "sound level" make a not of this position and do not go above this setting. Taking a minute to do this will help to prevent hearing damage in the future. After all, we want you listening for a lifetime. Introduction Your Autotek STEALTH amplifier has been designed to give you very high performance, and valuable features, at a reasonable price. Take time to read over this brief set of instructions, and you will get full enjoyment from your system. Installation The quality of the installation will affect system performance and reliability. You may wish to contact a dealer or professional installer. The amplifier is generally mounted in the rear trunk area but can be mounted in any convenient area such as beneath a seat. Please be sure to locate this unit where you have reasonable air circulation and protection from any hazard with moisture. When considering the mounting location you should minimize the length of the power supply and speaker leads. Minimizing both leads will provide higher audio output from the system. It is important to ensure that the cooling fans or the heat sink are not against a panel or a surface preventing air circulation. Mark the location from the mounting screw holes by using the amplifier as a template. Drill #29 or 9/64" diameter holes at the marked locations and firmly fasten the amplifier in place with the mounting screws supplied in the accessory kit. (Refer to Fig. 1) Caution Before drilling or cutting any holes investigate the layout of your automobile thoroughly; take care when working near the gas lines or hydraulic lines and electrical wiring. Warning This power amplifier has a protection feature to prevent any damage from misuse or faulty conditions-excessive heat, short circuited speakers or overload. If the unit senses one of the above conditions, the protection indicator will light and the system will shut down. To diagnose the problem turn all levels down, all power off and check the installation for possible wiring mistakes or shorts. In the event the amplifier shuts down due to excessive heat under adverse conditions simply allow time for the unit to cool down at which time, the protection indicator will not light. Power Supply Connections The +12VDC and ground wires should be heavy gauge standard copper wires with heavy insulation. The wire gauge should be 4AWG for the AMX50.2 and AMX100.2 or larger. In addition, it has a 12V remote control wire and it should be 14AWG-18AWG. It is preferable to have longer speaker wires and shorter power supply wires to minimize power losses. +12V Power This wire is usually connected directly to the positive battery terminal. Ensure that the + power supply wire. This connection must be completed by using spade lug with insulating sleeve. Ground This connection must be completed by using spade lug with insulation sleeve. This wire is the electrical ground and must be fastened securely to the vehicle chassis. The best method is to use a threading sheet metal screw since the threads cut into bare metal. Ensure that all paint coating or other insulation is removed from around the hole area and using self tapping screw, securely affix the bare wire ends to the vehicle chassis. Use as short a piece of cable as possible--use the same gauge as for the +12V. Remote Many radios or other music sources have an output terminal for connection of the remote turn-on of the power amplifier. If a radio doesn't have a remote turn-on feature, then you can use the antenna relay wire which activates the antenna motor. But you must take notice if the power antenna retracts when the tape player is operating. In this case, you can't use the antenna relay wire to operate the remote turn-on. Caution First make +12V wire connection then the ground connection and finally the remote connection. Furthermore the +12V wire must always be fused at the battery for production against possible damage. If you need to replace the power fuse, replace it with a fuse of the same value. Using a fuse of a different type or rating m result in a serious hazard. This amplifier has two types of signal input terminal. RCA connector for low input. Adjustment of input levels is accomplished by the gain control of both channels. Adjusting this control allows the amplifier gain to be controlled to match and balance both channel. The RCA input connector should be used when connecting the radio/cassette line out and this connection is usually made by using RCA-RCA connector wires. RED connector is used for 2/4 channel and WHITE connector is used for 1/3 channel. • • • • • • • The amplifier can be used in the STEREO, 3CH MODE, and 2CH MONO MODE as shown in Fig. 4, Fig. 5, Fig. 6. The speaker wires should be connected to the speaker terminal on amplifier. Notice that most speakers have a polarity marking such as “+” or a dot on speaker terminals and these marking denote the positive terminals of the speaker and are used as a guide to phase the speakers. Improper phasing causes a loss of bass response. When used in the 2CH MONO mode the speaker wires should be connected to the output terminals of the amplifier as shown. (Ref. To Fig. 6) When operating 4-speaker system, the impedance of the speaker is an important factor. Do not use less than 2 ohm in the 2CH MONO mode. Do not use speakers in the parallel for less than a 1 ohm load per channel in the stereo mode. Too low impedance loads will cause excessive heat radiation from the amplifier and the protection circuit will be operated to prevent a damage. In this case, you must reduce the volume to the proper level. Caution Be careful not to connect speaker(-) to the ground or chassis. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. RCA Line Output Jacks Full range output from channel 1/2CH inputs is provided at Line Out Jacks RCA Low Level Input Jacks It allows 1/2CH and 3/4CH inputs to be connected to the amplifier using RCA plugs. Input Level Controls It allows for the adjustment of the gain of both channels to match the output level of the source. High Variable Controls Adjust the crossover frequency of the High Pass output only, from 75Hz to 750Hz. Low Variable Controls Adjust crossover frequency of the LOW pass output only, from 40Hz to 150HZ. Bass Boost Controls Adjust the sub boost level of the selected frequency output from 0dB to +18dB. X-over switch a) Low position: Allows for the control of the low pass frequency range (40Hz-150Hz) by using the Low Variable. b) Flat position: Allows for full range pass through. c) High position: Allows for the control of the high pass frequency range (75Hz-750Hz) by using the High Variable. Subsonic Filter It allows to delete the frequency under 35Hz for Subwoofer protection. Power & Protection indicator It has two color indicators and the Green indicator indicates amplifier has turn on signal. The Red indicator indicates the fault operation of the amplifier. When the fault conditions (overload, excessive heat or short circuit of speaker) arise, the protection circuit is engaged to protect both the speakers and the amplifier against damage. Fuse It protects both the amplifier and automobile electrical system from fault conditions. Use a standard automotive fuse, 600.S:40Ax2. Power connection Connects +12VDC power wire from the battery and also connects ground wire from a suitable ground point on the chassis. Remote connection Connects the control wire which allows the amplifier to be turned on and off by the radio cassette player. Speaker Terminal It allows the connection of speakers to the amplifier. SPECIFICATIONS STEALTH 600.S *Audio power output per Channel, *both channels driven at 14.4VDC. - 4 ohm Stereo, 12.0volt 20Hz-20kHz <.018%THD 75watts/ch - 2 ohm Stereo, 14.4volt 20Hz-20kHz <.02%THD 175w/ch - 4 ohm Stereo, 14.4volt 20Hz-20kHz <.05%THD 350watts x 2 * Signal to Noise Ratio >90dB * Frequency Response 10Hz-40kHz, ? 1dB * Crossover: Separate - High Pass 75Hz-750Hz Variable - Low Pass 40Hz-150Hz Variable - Slope 0--12dB OCTAVE - Subsonic Filter 35Hz (-3dB) - Bass Boost 0—18dB Variable * Input Sensitivity 200mV-4Volts Variable * Input Impedance - Low level input 22K ohms * Damping Factor 180 into 4 ohms * Channel Separation >70dB * Power Supply Consumption * (Bridge RMS) 77A * Fuse Rating 40A x 2 * Dimension (W 10.5” * Dimension x H 2.3” * Dimension x L inch) 17.3” ** 1. These specifications can be changed without notice ** 2. Please note that the features shown in this manual may vary from model to model. We Want You Listening for a Lifetime Used wisely, your new sound equipment will provide a lifetime of fun and enjoyment. Since hearing damage from loud noise is often undetectable until it is too late, this manufacturer and the Electronic Industries Association's Consumer Electronics Group recommend you avoid prolonged exposure to excessive noise. This list of sound levels is included for your production. Decibel Level 30 40 50 60 70 80 Example Quiet library, soft whispers living room, refrigerator, bedroom away from traffic Light traffic, normal conversation, quiet office Air conditioner at 20 feet, sewing machine Vacuum cleaner, hair dryer, noisy restaurant Average city traffic, garbage disposals, alarm clock at two feet. THE FOLLOWING NOISE CAN BE DANGEROUS UNDER CONSTANT EXPOSURE. 90 100 120 140 180 Subway, motorcycle, traffic, lawn mower Garbage truck, chain saw, pneumatic drill Rock band concert in front of speakers, thunderclap Gunshot blast, plane Rocket launching pad Information courtesy of the Deafness Research Foundation.