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Istruzioni per l'uso Blaupunkt, Modello PCA 250

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Also, such an installation more easily supports a standard 2 speaker woofer box that may already be constructed. Since two woofers can play 6 decibels louder than one at a given power (due to acoustical laws of “mutual-coupling”), the resulting sound pressure level is substantial. This is probably the most common use for a conventional two channel amplifier there is. SYSTEM CONFIGURATION #4 1 Channel Bridged Subwoofer Mode By electrically connecting a subwoofer speaker in the way shown above, you are able to greatly increase the output power delivered from the amplifier to the speaker. Such a circuit increases the voltage “swing” across the speaker which increase the power seen by a factor of 2 to 4 times that in stereo mode. Subwoofer Full-Range Full-Range Full-Range Full-Range 4. (main) For higher output, you can connect a subwoofer to two output channels. Look for the + and – to indicate the correct connections. This is a very logical set-up for systems that are space limited to allow for only one subwoofer in a vehicle. The number and box volumes are compensated by simply more amplifier power pushing a single speaker. Such a configuration is also a surprisingly good performer. These increases in power are always welcome but you must take care to avoid low impedances (below 4 ohms) since most amplifiers will overheat and shut down if over-driven into such a configuration. You must also take care that you are not exceeding the thermal, or excursion, power limiting values for the woofer. Surprisingly high power levels can be achieved with such a system without realizing it thus quickly damaging the woofer. – 9 – TROUBLE-SHOOTING GUIDE Below is a basic trouble-shooting guide to assist in seeking out and correcting a problem that may occur in the installation process. Although lengthy, this chart cannot address every single problem possible but mainly the ones most common. SYMPTOM PROBABLE CAUSE OR CORRECTION No power (power light not on) ¦ Check connections to amps +12 volt, ground, and remote lines. ¦ Use voltmeter to verify voltages are at terminals of amp. ¦ Check main power connection at battery. ¦ Check fuse in power line at battery. ¦ Disconnect all speakers but not power lines - if unit then turns on, a speaker short or speaker line touching vehicle chassis is likely. Power but no sound (power light is on) ¦ Check all input cable lines for connection. ¦ Disconnect speakers from amp, test speaker lines with digital voltmeter to verify >2 ohms per channel (non-bridged mode). No sound from one channel or entire side ¦ Check radio’s balance and fader control positions - verify they are at center. ¦ Check speaker connections at amp and speaker. ¦ Check input leads for connection to amp. Very low sound level ¦ Verify radio balance and fader controls are at center positions. ¦ Check amplifier’s input gain control setting - adjust for higher output levels if necessary (gain settings closer to 0.3 volts). ¦ Receiver may have very low output voltage levels - a step up “line driver” may have to be used. Power amplifier turns on and off repeatedly Make sure power connections at batter are tight. (motor-boating sound) ¦ Verify battery voltage is >11.5 volts DC (12.5-15V engine on) at amplifier with engine off. ¦ Check all radio and amplifier ground connections. Amplifier turns off during loud or distorted Input stage being over-driven - lower input gain (closer to 4 volt setting). passages ¦ Verify battery voltage is >11.5 volts DC at amplifier with engine off. ¦ Check all radio and amplifier ground connections. ¦ Verify speaker loads >2 ohms on all channels (non-bridged mode). Amplifier performs fine but gets very hot to Input gain control too high - lower accordingly (closer to 4.0 volt setting). the touch ¦ Verify speaker loads >2 ohms on all channels (non-bridged mode). ¦ Verify the mounting location allows for free air movement around the amp. Preferably, the amp should be mounted with fins up and down so rising heat moves quickly away from amp. Amplifier turn-on/turn-off pops or noises ¦ “turn on race” - disconnect trigger from radio and turn on/off via a wire jumper to power terminal. If noise goes away, the radio is turning on/off too slowly. This is radio problem and can only be corrected with outboard turn-on delay relay system. ¦ Radio “thump” - disconnect the RCA input lines to the amp and turn on/off via radio trigger. If noise goes away without RCA lines connected, the radio is sending pops out through RCA lines. This is a radio problem and can only be corrected with outboard turn-on delay relay system. Cracking noises on AM/FM radio but not Ensure the problem is “radiated noise” by placing a portable FM radio near the car on tape or cd. engine. If noise is picked up, then it is a vehicle problem and not your system. Research to isolate the source and properly shield or bypass. ¦ Are spark plugs and wires > 3 years old? These can often radiate substantial noise when old. ¦ Verify the engine bloc...