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manual abstract
Minimum wire gauge recommendations for the individual amplifiers are listed on the specification page. It is a good idea to use the same gauge wire for the amplifier ground that you use for the power wire. Be sure to examine the battery ground cable of the vehicle and upgrade it to a gauge of wire that can accommodate the extra load created by your amplifier installation. Remember, the amplifier can only deliver its rated output when it is not current limited by the power and ground supply wires. This amplifier is designed to drive a speaker load that measures from 24 ohms. Keep in mind that heat is the long-term enemy of automotive electronics and that the lower your speaker load, the more heat © 1999 Directed Electronics, Inc INSTALLATION GUIDELINES (continued) is generated. For low impedance 10. Due to the high-frequency MOSFET speaker applications or restricted switching power supply used in all ventilation installations, an external Directed Audio amplifiers, filtering cooling fan may be advisable. the power cable is not generally 9. Your connections to the amplifier’s required (remember that the amp speaker and power terminals can’t deliver full output if the power should be made with crimped spade supply is restricted). Proper lugs, and the battery and ground grounding of the signal source is connections to the vehicle should be mandatory for the amplifier to made with crimped ring terminals reach its performance peak. If the of the appropriate size (surface RCA inputs are not grounded area is what counts); soldering the adequately via the signal source, terminals after crimping is also electrical noise from the vehicle recommended. may be picked up in the system. © 1999 Directed Electronics, Inc 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. REMOTE TERMINAL - connect this terminal to the amplifier remote output from your head unit or signal source, if it provides one. You may also use the power antenna output wire from decks that do not have separate amp remote outputs. This input requires a switched +12V signal to activate the amplifier. Do FIGURE1—AMPLIFIER CONNECTIONS not connect this terminal to a constant source of +12V. 3. +12V POWER TERMINAL - connect this terminal to the positive terminal of the car or separate audio system battery. Refer to the installation guidelines and specs page for proper gauge of wire. YOU MUST PROTECT THIS WIRE WITH A FUSE or circuit breaker located close to the battery. 4. POWER FUSE - protects the amplifier against electrical damage. DO NOT REPLACE THE FUSE OR FUSES WITH LARGER AMPERAGE FUSES ! If the fuse(s) blows, check your system for wiring problems or see your dealer. 5. SUBWOOFER OUTPUT TERMINALS -connect the speakers to these terminals. Refer to the speaker wiring diagrams (pg. 6) for different wiring options. 4 © 1999 Directed Electronics, Inc 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 line- level 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. FIGURE 2—AMPLIFIER CONTROLS 5. CROSSOVER FREQUENCY - controls the frequency range of the amplifier. 6. BASS EQ - This switch activates an 8 dB bass boost circuit. Use as necessary for low frequency enhancement. 7. LED INDICATOR - the green Power LED lights to indicate normal operation. The green LED will shut off to indicate amp shutdown due to thermal, short circuit, DC offset, or over-current conditions detected by on-board protection circuits. © 1999 Directed Electronics, Inc 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. © 1999 Directed Electronics, Inc 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. • Try and keep the setting low enough to prevent image sm...