OWNER’S MANUAL Model 250d
CONGRATULATIONS Thank you for choosing a Directed Audio power amplifier. Directed has been the leader in high-quality and innovative security products in the U.S. since 1990. Now we introduce to the car audio industry the same winning formula - products that meet the stringent standards of today’s mobile electronics enthusiast yet priced for anyone’s budget.
TABLE OF CONTENTS Installation Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 2 Amplifier Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 4 Amplifier Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 5 Speaker Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . .Page 6 Crossover Setting and Gain Adjustment . . . . . . . . . . . . . . . .Page 7 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INSTALLATION GUIDELINES 1. Please read the owner’s manual carefully before you install the 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 amplifiers. 4. Pick a mounting location that will provide adequate access and ventilation and protect the amplifier from heat, moisture, and dirt. 5.
INSTALLATION GUIDELINES (continued) is generated. For low impedance speaker applications or restricted ventilation installations, an external cooling fan may be advisable. 9. Your connections to the amplifier’s speaker and power terminals should be made with crimped spade lugs, and the 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.
AMPLIFIER CONNECTIONS Refer to Figure 1 for details. 1. GROUND TERMINAL - connect this terminal to the car chassis with a short heavy gauge wire, DO NOT CONNECT TO THE NEGATIVE TERMINAL OF THE CAR BATTERY or to factory chassis ground points already occupied by factory wires! If you are grounding multiple amplifiers, you may use a high-current distribution block with proper gauge cables, or use individual grounds for each amp attached to the vehicle at separate but close ground points. 2.
AMPLIFIER CONTROLS Refer to Figure 2 for details. 1. RCA OUTPUT JACKS - use these jacks to route the input signal to another amplifier. 2. RCA INPUT JACKS - accepts linelevel outputs from head units or signal sources at voltages from 200 mV to 8 volts. 3. GAIN ADJUSTMENT - controls the gain (input sensitivity) of the amplifier. 4. PHASE INVERT SWITCH - controls the output phase of the amplifier. The signal is inverted with the switch set to 180. 5.
SPEAKER WIRING DIAGRAMS Single subwoofer connection Speaker nominal impedance must be at least 2 ohm. Amplifier parallels the speaker terminals internally. Two subwoofer connection Parallel speaker nominal impedance must be at least 2 ohm. Amplifier parallels the speaker terminals internally.
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. • Because the 250d is only suited for subwoofer applications, the low-pass crossover is active at all times. The crossover point is adjustable to allow more precise system operation.
SPECIFICATIONS model 250d 8 RMS continuous power driven into 4 ohms from 20 to 250 Hz with less than 0.4% Total Harmonic Distortion @ 14.4 VDC 125 watts RMS continuous power driven into 2 ohms from 20 to 250Hz with less than 0.6% Total Harmonic Distortion @ 14.
LIMITED TWO YEAR CONSUMER WARRANTY Directed Electronics, Inc. (DEI ) 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 DEI dealer.
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