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model
6550
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2 © 2002 Directed Electronics, Inc
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CONGRATULATIONS Congratulations for choosing a Directed enthusiast with years of high-quality Audio power amplifier from Directed audio reproduction. Electronics, the industry leader in high Directed Audio power amplifiers come quality automotive security and audio with a two-year limited warranty if equipment since 1990. installed by an authorized Directed Directed Audio power amplifiers dealer. If not installed by an authorized continue to set new standards of perfor- dealer, Directed Audio po
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LIMITED TWO-YEAR CONSUMER WARRANTY Directed Electronics, Inc. promises to the WARRANTY OF NON-INFRINGEMENT OF original purchaser, to replace this product INTELLECTUAL PROPERTY ARE EXPRESSLY should it prove to be defective in workman- EXCLUDED TO THE MAXIMUM EXTENT ship or material under normal use, for a ALLOWED BY LAW, AND DIRECTED period of two years from the date of NEITHER ASSUMES NOR AUTHORIZES purchase by the dealer as indicated by the ANY PERSON TO ASSUME FOR IT ANY date code marking of t
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FEATURES Dual high-speed MOSFET switching Two, four, and six channel input power supplies and complimentary allows full access to source or bipolar outputs. processor output functions. Thermal, DC offset, reverse polarity, Summed stereo full-range RCA and short circuit protection. outputs with variable two-way crossover. Top-mounted controls easily accessed for system tuning. Gold-plated wire terminals and RCA connectors ensure maximum signal Dual continuously variable 12 transfer. dB/oct
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INSTALLATION GUIDELINES 1. Please read this owner’s manual terminal. Use a fuse or circuit carefully before installing this ampli- breaker rated slightly more than the fier. on-board fuse(s) of the amplifier(s). The gauge of power 2. Disconnect the battery ground wire used should take into account terminal prior to making any elec- the total current draw of the trical connections. system, and the length of wire 3. Check for any hazards or obstruc- used. IASCA and other auto sound competition or
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speaker load, the more heat is 10. Due to the high-frequency MOSFET generated. For low impedance switching power supply, filtering the speaker applications or restricted power cable is not generally ventilation installations, an external required (remember that the amp cooling fan may be advisable. can’t deliver full output if the power supply is restricted). Proper 9. Battery and ground connections to grounding of the signal source is the vehicle should be made with mandatory for the amplifier
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FRONT PANEL CONNECTIONS/STATUS LED R RC CA A IIn np pu ut t J Ja ac ck ks s - 1. Accepts line level amplifier shuts down due to short outputs from head units or signal circuit, DC offset, or overheating processors at voltages between detected by the on-board protection 150mV and 8 volts. circuitry. 2. R RC CA A O Ou ut tp pu ut t J Ja ac ck ks s - These pass 4. R Re em mo ot te e S Su ub b L Le ev ve ell C Co on nt trro oll - Controls through RCA jacks can be used to the gain of channels five a
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REAR PANEL CONNECTIONS 1. S Sp pe ea ak ke err O Ou ut t T Te errm miin na alls s - Connect the remote turn on lead of the head the speakers to these terminals. unit or signal source. If a (+) 12 (Refer to the Speaker Wiring volt remote turn on lead is not Diagrams section of this guide.) available, the Remote Power Adapter (P/N #55000) can be P Po ow we err F Fu us se es s - 2. These fuses protect used to supply a remote turn on the amplifier against internal elec- signal. DO NOT connect this
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TOP PANEL CONTROLS 1. IIn np pu ut t G Ga aiin n A Ad djju us st tm me en nt t - Controls 4. B Ba as ss s E EQ Q S Sw wiit tc ch h - Adds 8 db of addi- amplifier sensitivity and is used to tional boost to channels five and six match the input level of the amplifier output when active. to the output level of the signal 5. IIn np pu ut t P Pa arra alllle ell S Sw wiit tc ch h - Controls the source. input signal to the indicated channels. If the 3+4 switch is ON, channels 2. C Crro os ss so ov ve e
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TOP PANEL FEATURES Control Panel Cover Remove/Install The gain and filter controls are located Four Allen-head screws hold the control under a control panel cover on top of panel cover to the amplifier top panel, the amplifier. The control panel cover one at each corner. They can be must be removed to gain access to the removed with the wrench supplied in gain and filter controls. the hardware pack. SPEAKER WIRING DIAGRAMS Stereo operation (top view) Four Channel Stereo with Mono Sub Six Channel
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Tri amp operation (top view) Bridged operation (top view) Three Channel N NO OT TE E:: 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. 12 © 2002 Directed Electronics, Inc
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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. The crossover frequency control needs to be adjusted to suit
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SPECIFICATIONS Directed model 6550 Ch 1-4 Ch 5-6 RMS continuous power per channel, Channels 1-4 driven 50 75 watts watts 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. RMS continuous power per channel, Channels 1-4 driven 75 125 watts watts into 2 ohms from 20 to 20,000 Hz, with less than 0.1% Total Harmonic Distortion @ 14.4 VDC. Channel 5-6 driven into 2 ohms from
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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. technology, Directed is ISO 9001 registered. Vista, California 92083 Directed® is committed to delivering world-class quality products and services that excit
