model 6550
© 2002 Directed Electronics, Inc
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 Dual high-speed MOSFET switching power supplies and complimentary bipolar outputs. Two, four, and six channel input allows full access to source or processor output functions. Thermal, DC offset, reverse polarity, and short circuit protection. Top-mounted controls easily accessed for system tuning. Summed stereo full-range RCA outputs with variable two-way crossover. Dual continuously variable 12 dB/octave two-way active crossovers (ch 1-6, RCA output).
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. © 2002 Directed Electronics, Inc 10.
FRONT PANEL CONNECTIONS/STATUS LED 1. RCA Input Jacks - Accepts line level outputs from head units or signal processors at voltages between 150mV and 8 volts. amplifier shuts down due to short circuit, DC offset, or overheating detected by the on-board protection circuitry. 2. RCA Output Jacks - These pass through RCA jacks can be used to send a signal to a second amplifier. It is the summed stereo output of the one through four channel inputs of the amplifier. 4.
REAR PANEL CONNECTIONS 1. Speaker Out Terminals - Connect the speakers to these terminals. (Refer to the Speaker Wiring Diagrams section of this guide.) the remote turn on lead of the head unit or signal source. If a (+) 12 volt remote turn on lead is not available, the Remote Power Adapter (P/N #55000) can be used to supply a remote turn on signal. DO NOT connect this terminal to constant (+) 12 volt. 2.
TOP PANEL CONTROLS 1. Input Gain Adjustment - Controls amplifier sensitivity and is used to match the input level of the amplifier to the output level of the signal source. 4. Bass EQ Switch - Adds 8 db of additional boost to channels five and six output when active. 5. Input Parallel Switch - Controls the input signal to the indicated channels. If the 3+4 switch is ON, channels three and four will derive their signal from channels one and two RCA jacks and no input is needed.
TOP PANEL FEATURES Control Panel Cover Remove/Install The gain and filter controls are located under a control panel cover on top of the amplifier. The control panel cover must be removed to gain access to the gain and filter controls. Four Allen-head screws hold the control panel cover to the amplifier top panel, one at each corner. They can be removed with the wrench supplied in the hardware pack.
Tri amp operation (top view) Bridged operation (top view) Three Channel NOTE: 12 When wiring the 6550 for three channel operation, connect the left audio signal to both channels one and two RCA jacks and the right audio signal to both channels three and four RCA jacks 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. For full-range and simultaneous stereo/mono bass applications, the crossover selection switch should be set to FLAT. If the amplifier is driving your subwoofers, set the switch to LPF, and for mid-bass/midrange output, set to HPF.
SPECIFICATIONS Directed model 6550 14 Ch 1-4 Ch 5-6 RMS continuous power per channel, Channels 1-4 driven into 4 ohms from 20 to 20,000 Hz, with less than 0.08% total Harmonic Distortion @ 14.4 VDC. Channel 5-6 driven into 4 ohms from 20-250 Hz, with less than 0.08% THD @ 14.4 VDC. 50 watts 75 watts RMS continuous power per channel, Channels 1-4 driven into 2 ohms from 20 to 20,000 Hz, with less than 0.1% Total Harmonic Distortion @ 14.4 VDC.
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 92083 www.directed.com technology, Directed is ISO 9001 registered.
