model 350d
CONGRATULATIONS Congratulations for choosing a Directed Audio power amplifier from Directed Electronics, the industry leader in high quality automotive security and audio equipment since 1990. Directed Audio power amplifiers continue to set new standards of performance, reliability, and affordability in the mobile electronics industry.
LIMITED TWO-YEAR CONSUMER WARRANTY Directed Electronics, Inc. promises to the original purchaser, to replace this product should it prove to be defective in workmanship or material under normal use, for a period of two years from the date of purchase by the dealer as indicated by the date code marking of the product PROVIDED the product was installed by an authorized Directed dealer.
FEATURES Super-efficient Class D PWM design. Switchable phase invert function. Runs much cooler than conventional amp designs. Optional remote subwoofer level control feature. High-speed MOSFET switching power supply. Buffered RCA output jacks for biamp operation. High-current N-channel MOSFET outputs stable into 2 ohm loads. Variable input sensitivity optimizes match with different signal sources. Thermal, DC offset, reverse polarity and short circuit protection.
INSTALLATION GUIDELINES 1. Please read this owner’s manual carefully before installing this amplifier. 2. Disconnect the battery ground terminal prior to making any electrical connections. 3. Check for any hazards or obstructions such as gas tanks, fuel or brake lines, and wiring harnesses before mounting the amplifier. 4. Pick a mounting location that will provide adequate access and ventilation and protect the amplifier from heat, moisture, and dirt. 5.
speaker load, the more heat is generated. For low impedance speaker applications or restricted ventilation installations, an external cooling fan may be advisable. 9. Battery and ground connections to the vehicle should be made with crimped ring terminals of the appropriate size (surface area is what counts); soldering the terminals after crimping is also recommended. 6 10.
FRONT PANEL CONNECTIONS/CONTROLS 1. RCA Output Jacks - These pass through RCA jacks can be used to send a signal to a second amplifier. 6. Bass EQ Switch - Adds an additional 8 db of boost to the subwoofer output when on. 2. RCA Input Jacks - Accepts line level outputs from head units or signal processors at voltages between 150mV and 8 volts. 7.
REAR PANEL CONNECTIONS 1. Sub Out Terminals - Connect the speakers to these terminals. (Refer to the Speaker Connection section of this guide.) 2. Power Fuse - This fuse protects the amplifier against internal electrical damage and is meant to protect the amplifier only. All other power connections should be fused at the source. 3.
SPEAKER WIRING DIAGRAMS Single subwoofer connection (top view) Two subwoofer connection (top view) NOTE: The dual + and -- sub-out terminals of the 350d are paralleled internally and the combined load impedance should be taken into consideration when connecting multiple subwoofers.
CROSSOVER SETTINGS AND GAIN ADJUSTMENT Your Directed Audio power amplifier needs to be adjusted carefully to achieve maximum performance. These are some guidelines to follow when fine-tuning the amplifier. 10 Because this amplifier is only designed for subwoofer applications, the low-pass crossover is active at all times. The crossover point is adjustable to allow more precise system operation.
SPECIFICATIONS Directed model 350d RMS continuous power driven into 4 ohms from 20 to 250 Hz with less than 0.4% Total Harmonic Distortion @ 14.4 VDC 150 watts RMS continuous power driven into 2 ohms from 20 to 250Hz with less than 0.6% Total Harmonic Distortion @ 14.
The company behind this system is Directed Electronics, Inc. Since its inception, Directed has had one purpose, to provide customers with the finest vehicle security, car stereo products, rear seat entertainment, and accessories available. The recipient of more than 20 patents in the field of advanced electronic Directed Electronics, Inc. Vista, California 92081 www.directed.com technology, Directed is ISO 9001 registered.
