750d models 1500d
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 runs much cooler than conventional amps. High-speed MOSFET switching power supply. High-current complimentary MOSFET outputs stable into one ohm loads. Thermal, DC offset, reverse polarity, and short circuit protection with status LED. Master/slave RCA jack functions support two amps bridged to one load. Top-mounted controls easily accessed for system tuning. Continuously variable 18 dB/ octave low-pass crossover.
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 3. RCA Bridge Output Jack - This output sends an out-of-phase signal to a slave amplifier when connected in the External Synced Bridged combination. (Refer to the Combined Amplifiers section of this guide) 1. RCA Input Jacks - Accepts line level outputs from head units or signal processors at voltages between 150mV and 8 volts. 2.
REAR PANEL CONNECTIONS 1. Sub Out Terminals - Connect subwoofers to these terminals. (Refer to the Speaker Wiring Diagrams section of this guide.) 2. Status LEDs - The Power LED will light GREEN to indicate the amplifier is on and operating normally. The GREEN LED will turn off and the Protection LED will light RED when the amplifier has shut itself down due to speaker short circuit, DC offset or overheating. 3.
FIGURE 2—AMPLIFIER CONNECTIONS 750d REAR 1 3 2 FUSE 30A x 2 4 5 6 BATT REM GND POWER SUB OUTPUT PROTECTION FIGURE 3—AMPLIFIER CONNECTIONS 1500d REAR 1 2 3 FUSE 30A x 3 4 5 6 BATT REM GND POWER SUB OUTPUT © 2003 Directed Electronics, Inc PROTECTION 9
TOP PANEL CONTROLS 1. Input Gain Adjustment - Controls the amplifier’s sensitivity and is used to match the input level of the amplifier to the output level of the signal source. frequencies below 30Hz. Frequencies below 30Hz will be attenuated by 24db per octave. 4. Bass EQ Switch - Adds 8db of additional boost to the subwoofer output when active. 2. Crossover Frequency Adjustment Adjusts the crossover point for the on-board low-pass crossover. 5.
SPEAKER WIRING DIAGRAMS Single subwoofer connection (top view) Two subwoofer connection (top view) NOTE: The dual + and -- subout terminals of the 750d/1500d are paralleled internally and the combined load impedance should be taken into consideration when connecting multiple subwoofers.
COMBINING AMPLIFIERS The Viper 750d/1500d subwoofer amplifiers have the capability of connecting two or more amplifiers of the same power rating together in a master/slave combination for increased power with accurate level matching. They are the Parallel Synced Gain and External Synced Bridged combinations. WARNING: DO NOT attempt to combine amplifiers of different power ratings. These amplifier combinations work correctly only if the Master and Slave amplifiers are identical models.
PARALLEL SYNCED GAIN CONNECTIONS/SETTINGS 1. Input Signal - Connect these RCA jacks as described in the Front Panel Connection section of this guide. 2. Slave/Master Switch Set the slave/master switch on the master amplifier to the MASTER position. Set the slave/master switch on the slave amplifier to the SLAVE position. Setting the slave/master switch on both amplifiers will automatically set the I/O RCA jack configuration according to each amplifier’s slave or master designation. NOTE: 4.
FIGURE 5—PARALLEL SYNC GAINED 750d/1500d Master 2 1 INPUT I/O SLAVE R SLAVE IN SYNC OUT L BRIDGE OUT MASTER REMOTE Do Not Use 3 4 Slave INPUT I/O MIN SLAVE R SLAVE IN SYNC OUT L BRIDGE OUT Do Not Use MAX SUB LEVEL MASTER REMOTE 2 Do Not Use Subwoofer Wiring (top view) 5 NOTE: 14 The dual + and -- subout terminals of the 750d/1500d are paralleled internally and the combined load impedance should be taken into consideration when connecting multiple subwoofers.
EXTERNAL SYNCED BRIDGED CONNECTIONS/SETTINGS 1. Input Signal - Connect these RCA jacks as described in the Front Panel Connection section of this guide. 2. Slave/Master Switch Set the slave/master switch on the master amplifier to the MASTER position. Set the slave/master switch on the slave amplifier to the SLAVE position. Setting the slave/master switch on both amplifiers will automatically set the I/O RCA jack configuration according to each amplifiers slave or master designation. NOTE: 3.
FIGURE 6—EXTERNAL SYNC BRIDGED 750d/1500d Master 1 Do Not Use 2 INPUT I/O SLAVE R SLAVE IN SYNC OUT L BRIDGE OUT MASTER REMOTE 3 4 Slave INPUT I/O MIN SLAVE R SLAVE IN SYNC OUT L BRIDGE OUT Do Not Use MAX SUB LEVEL MASTER REMOTE 2 Do Not Use Subwoofer Wiring 5 16 NOTE: The dual + and -- subout terminals of the 750d/1500d are paralleled internally and the combined load impedance should be taken into consideration when connecting multiple subwoofers.
MULTIPLE AMPLIFIER COMBINATIONS The Directed 750d/1500d subwoofer amplifiers can also be used in multiples of the master/slave combinations allowing for unlimited expansion to a systems subwoofer section. To use multiples of amplifier combinations the following directions must be adhered to for best results. Audio signal - Divide the head unit or processor audio signal to the master amplifiers by using RCA Y adapters.
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. 18 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 750d 1500d RMS continuous power driven into 4 ohms from 20 to 250 Hz @ 14.4 VDC at rated power/load. 275 watts 0.4% THD 425 watts 0.5% RMS continuous power driven into 2 ohms from 20 to 250 Hz @ 14.4 VDC at rated power/load. 400 watts 0.6% THD 800 watts 0.7% RMS continuous power driven into 1 ohm from 20 to 250 Hz @ 14.4 VDC at rated power/load. 600 watts 0.8% THD 1100 watts 0.9% Dynamic power rating (IHF-202 Standard) minimum load.
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.
