Soundstream Technologies SMA2.480 User's Manual
Contents
1. 4 UAL 2 680 ER SMAN s 40 2 480 2 700 SM OWN wo TABLE OF CONTENTS Y j r4 INTRODUCTION E ode EL 2 o 2 r4 A FEATURES amp SPECIFICATIONS 3 CONTROLS amp FUNCTIONS 5 4 9 w 2 PLANNING amp MOUNTING YOUR SYSTEM 10 lt a P WIRING DIAGRAM GBr Siena 11 12 2 Channel Wiring Diagram ARA ooo ono 11 4 Channel Wiring Diagram 12 ADJUSTING amp TUNING gt SRR Re s ae eerie ee nenn 1 TROUBLE SHOOTING nn enn e 1 INTRODUCTION Amplifier s provide high performance sound reinforcement for you re mobile audio equipment The Multi Mode bridging capabilities allow flexibility in hosting several different speaker configurations To achieve optimum performance it is highly recommended that you read this Owners Manual before beginning installation FEATURES amp SPECIFICATIONS FEATURES_ Digital Full range Amplifier Fully regulated MOSFET power supply PWM circuitry 2 Ohm stable stereo Tri guard amplifier protection e DI Intelligent Distress Indicator gives a visual indication of the amplifiers protection status Platinum RCA inputs and outputs Bi linear selectable crossover for inputs and outputs Hi Full Low Continuously variable High pass filter 50Hz 250H7 1 2dB slopes Continuously variable Low pass filter 50Hz 252. 0Hz 12dB slopes Subwoofer equalizer control 0 12dB Input sensitivity 200mV 8V Frequency response 10Hz 20KHz S N ratio 100 dB OEM floating ground input Platinum 4 gauge power connectors Tri mode operation Specifications 240x2 480x1 30Ax1 175x2 350x2 700 x 1 25Ax2 8 7 x2 x 11 5 asxa 170x4 340x2 30Ax2 8 7 x 2 x 12 7 Controls amp Functions SMA2 340 2 480 2 700 FRONT LINE OUT LINE IN 09 OJO SMA2 700 REAR YN Z 9 E cS zZ La o 7 l lo 4 gt Z o O Controls amp Functions SMA4 680 FRONT SMA4 680 REAR mi Controls amp Functions 1 Input Level Adjustment MIN MAX ne j This control adjusts the amplifier s input sensitivity Input sensitivity is variable from 200 Millivolts to 8 volts Clockwise increases sensitivity Counterclockwise decreases sensitivity The amplifier can be driven to full power with a wide range of signal levels A lower signal level will require increased sensitivity for full power A higher signal level will require decreased sensitivity Avoid setting sensitivity lower than necessary as this would introduce unwanted distortion 2 Crossover Frequency Control ir FREQUENCY 50 250 Y Z gt P cS Z Us al lo w r Z le Oo This control is used to set the desired bass frequency 50 250HZ The filter acts to cut off frequencies above th
3. e set point In general the selected frequency should closely match the resonant frequency of the speaker box 3 Mode Crossover Switch nn re Se MODE LPF FULL HPF Adjust the crossover for your chosen installation method LPF Low pass filter only bass tones go to speakers Use with woofer or sub woofer FULL No filter all tones go to speakers Use with full range speakers or with external crossovers HPF High pass filter blocks very low tones from the speakers YN Z Q O z 2 bia o Y i le 2 E Z O Controls amp Functions_ O 12d8 By using the bass boost function bass notes at 50Hz are emphasized as much as 12dB y NEJN LINE QUT LINE OUT LINE IN CH3 CHI CHA ts a L yy Sa gt HO O LIO ASAS YY 4 OQO O O L S En ee cH2 SMA2 340 2 480 2 700 1 SMA4 680 These inputs are for signal cables from the source Always use high quality shielded RCA cables LINE IN LINEQUT LINE OUT LINE IN CHa cH1 ee EN OOo LEMOA MO A A NI A OOO OO CH4 CH2 CH2 te SMA2 340 2 480 2 700 SMA4 680 The LINE OUT allows you to build multiple amplifier systems without having to use splitter cords to distribute the signal Now it is simply a matter of bringing one set of RCAS into the first amplifier then using the line out RCA jacks as the feed to the next amplifier Controls amp Functions PROTECTION Po
4. kers while blocking lower frequencies from midrange speakers Lowering the Bass frequencies allows lower frequencies to reach the midrange speakers while blocking higher frequencies from bass speakers Trouble Shooting SYMPTOMS CHECK REMEDY Is the power Check all fuses to amplifier LED illuminated Be sure Turn on lead is connected NO check signal leads Check gain control Check Tuner Deck volume level Clean contacts on fuse holders Is the Diagnostic Check for speaker short or LED iltuminated YES amplifier overheating AMP NOT No power to power wire Repair power wire or connections SWITCHING ON No power to remote Check connections to radio wire with receiver on Burnt or broken fuse Replace fuse Check Speaker Leads Inspect for short circult or an open connection Check Audio Leads Reverse Left and Right RCA inputs to determine if the problem is occurring before the amp AMP TURNING Check Speaker load impedance Be sure proper speaker load impedance recommendations are observed If you use an ohmmeter to check speaker resistance please remember that DC resistance and AC impedance may not be the same PROTECTION Turn radio down LAMP ON Wait for AMP to cool Speaker wires shorted Separate speaker wires and insulate je e e N W al a 2 je a j
5. n the Amplifier The amplifier automatically tums on within a few seconds after remote voltage Is applied If your system is set up so that the headunit provides the remote voltage then it would turn on when your stere is tumed on Note that there are alternate means of providing the 12 volt remote contro signal including installing and auxiliary switch Adjusting The Audio Level As stated previously it is important to obtain a close match between the source unit s output voltage and the amplifier s sensitivity or admittance setting 1 Use a screwdriver to turn GAIN MIN MAX fully counterclockwise to MIN 2 Turn the auto sound system s volume control to about one third of its full range 3 Adjust GAIN MIN MAX to a comfortable listening level 4 Turn up the auto sound system s volume control until the sound begins to distort Then immediately turn the volume down to a point Just before where the distortion began Caution Never turn up the auto sound system s volume control more than needed to adjust the audio level more than two thirds of Its maximum volume 5 Adjust GAIN MIN MAX until the sound is at the maximum level you want the amplifier to produce 6 Adjust the auto sound system s volume control to a comfortable listening level FREQUENCY RESPONSE BASS BOOST ON dB RESPON 0 42 100 500 1K 5K 20K 50K FREQUENCY Hz NOTE Raising the Bass frequency allows higher frequencies to reach the bass spea
6. ventilation A Select a suitable location that is convenient for mounting is accessible for wiring And has ample room for air circulation and cooling B Use the amplifier as a template to mark the mounting holes Remove the Amplifier and drill holes Use extreme caution inspect underneath surface before drilling C Secure the Amplifier using the screws provided PLANNING amp MOUNTING YOUR SYSTEM Wiring Diagram SMA2 340 2 480 2 700 SUB WOOFER 4 8 OHM LEFT SPEAKER RIGHT SPEAKER 2 8 OHM 2 8 OHM LEFT SPEAKER RIGHT SPEAKER 4 8 OHM 4 8 OHM SUB WOOFER 8 OHM 00 INDUCTOR LOW PASS FILTER 1 H CAPACITOR HIGH PASS FILTER TRI MODE OPERATIONAL OUTPUT allows a Speaker to be operated in MONO model while the main speakers are playing in stereo Leave the Crossover Sub woofer switch on Full position Use a 100 Volt non polar capacitor for a high pass crossover and a wire coil inductor to block high frequencies from the Sub Woofer as shown in the figure below Capacitor and inductor values as written in the section below determine crossover frequencies SPEAKER IMPEDANCE ers OHMS eS en en nee 11 8 mH 600 uF 1 6 dB Octive High Pass and Low Pass Filter Wiring Diagram SMA4 680 INDUCTOR LOW PASS FILTER o CAPACITOR SUB WOOFER HIGH PASS FILTER 8 OHM 6 dB Octive High Pass and Low Pass Filter 5 O Z a o Z gt Tuning o
7. wer PWR Power This GREEN LED will illuminate when the amplifier is turned ON If it fails to illuminate check the power connections to the Amplifier and fuses PROT Protection The amplifier protection circuitry will disable the amplifier if input overload short circuit or extremely high temperature conditions are detected When the protection mode is in operation the LED indicator on the side panel will be illuminated indicating the amplifier has gone into a self preservation mode If you observe that the Protection LED is lit please check the system carefully to determine what has caused the protection circuit to engage The amplifier can be reset by turing the remote power off and then on again If the amplifier shut down due fo a thermal overload condition please allow it to cool down before restarting If the amplifier shut down because of an input overload or short circuit be sure to repair these conditions before attempting to power up the amplifier again Power ze Remete arenas l es j Due to the power requirements of the Amplifier this connection should be made directly to the positive terminal of battery For safety measure install an in line fuse Holder not included as close to the battery positive terminal as possible with an ampere rating not to exceed total value of fuses in Amp P ee Power 12 Remote Ground Te ST 1 i 7 u Z Q m zZ Le lo
8. x Z O Controls amp Functions_ LA _ _ To avoid unwanted ignition noise caused by ground loops it is essential that the Amplifier be grounded to a clean bare metal surface of the vehicles chassis Note GROUND WIRE SHOULD NOT BE EXTENDED MORE THAN 3 FT 1 METER Planning and Mounting Your System CH1 ono Y Eos c E SMA2 340 2 480 2 700 SMA4 680 The mounting position of your Amplifier will have a great effect on its ability to dissipate the heat generated during normal operation Under normal conditions the heatsink will dissipate sufficient heat to avoid thermal shutdown However please do not install the amplifier in a wooden box or similar device as this will prevent heat dissipation into the atmosphere Temperatures in car trunks have been measured as high as 155 F in the summer time since the thermal shut down point for the amplifier is 158 F it is easy to see that it must be mounted for maximum cooling capability To achieve maximum advantage of convection air flow in an enclosed trunk mount the amplifier in a horizontal position Cooling requirements are considerably relaxed when mounting inside the passenger compartment since the driver will not often allow temperatures to reach a critical point Floor mounting under the seat is usually satistactory as long as there is at least 1 inch of clearance 2 54 cm above the Amplifier s fins for
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