Rockford Fosgate 50.1, 50.2 manual Time for Processors, Summation

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B.If the deck is quiet, then congratulations, you're on your way to a successful installation. It is now time to slowly, methodi- cally, reinstall the deck back into its final position. Test for noise each step of the way. If the noise returns, suspect the signal cables. Forget shielding because it will have only a very, minimal effect within the audio band. We highly suggest using twisted pair cables or a balanced transmission system for cable induced noise.

Time for Processors:

By the end of Step III, you should have the deck playing quietly with the amp, with the quiet cables quietly routed. So it's time to add the signal processors – one at a time – back into the system. Simply repeat Steps II and III with the equalizer, then the electronic crossover, etc. However, before MOVING THE SIGNAL PROCESSORS to the amplifier, we highly suggest that you power the noisy process from an isolated power supply rather than the car's +12 volts DC and chassis ground. Make sure to also connect the turn- on lead to the isolated power supply. If the processor is now quiet, then it is highly probable that the component has inadequate isolation. Solutions include changing components or permanently adding an external isolated power supply (Call Autosound 2000 at 209-465-3450 for info on isolated power supplies).

Summation:

During the design stage of your vehicles, try to avoid using extra batteries and high output alternators. Extra batteries are nothing but loads as soon as the engine is started and high output alternators usually make more noise than stock alternators. Also, extra batteries installed in the trunk of a car will ALWAYS force extra ripple current to flow over the car.

Install Stiffening Capacitors® as close to the power supply input of your amplifier as possible. The big caps will feed the switching power supplies of your amps and minimize the inductive losses in your power wiring. Plus, they will help your peak system response.

In problem cases, we highly recommend the use of twisted pair cable rather than coaxial cable for RCA leads. This practice will greatly minimize cable induced noise – especially in four channel amps!

Don't forget that your system is only as good as its worst component. Do NOT use components with inadequate power supply isolation or you will be asking for problems.

The best electrical ground on a car is the CHASSIS of the car. Do NOT run ground leads up to the case of the alternator or the negative battery post. Keep ALL ground leads as short as possible.

With properly isolated components, it does NOT matter where the component is grounded. We're sorry to say that with inadequately isolated components, it matters! With poorly isolated components, different grounds can cause different noises.

The deck is the signal reference ground for the entire sound system. The deck usually has THREE connections to the car's chassis: The black ground lead, the base of the antenna, and the metal-to-metal bond between the case of the deck and the chassis of the car. With three grounds, there is usually NO cause to worry about the ground of a deck.

Amplifiers are usually designed with adequate power supply isolation. This means that it should not matter where a deck is grounded. (Decks are grounded three times and amps float. This is car audio!)

The more components installed on a signal path, the more chances for noise to enter a system. The more electrical accessories on a car, the more noise will be produced by the alternator.

This information was compiled from more than 20 years of working in car audio. If you would like more information on this topic, or any other technical aspects of car audio, please call 800-548-8200 and ask for a subscription to Autosound 2000 Tech Briefs

— the monthly magazine for the technically inclined.

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Contents 50.1 powerpower new chrome heatsinkPRACTICE SAFE SOUND G E T T I N G S TA R T E D TABLE OF CONTENTSPunch Power PUNCH AMPLIFIER ACCESSORY PACKPunch Power INTRODUCTION TO 50 SERIESTECHNICAL DESIGN FEATURES XCard Internal Crossover Stereo Pass-ThruDSM Discrete Surface Mount Technology ITS Increased Thermal Stability Balanced Line InputsNOMAD NOn-MultiplyingAdvanced Decision 50.2 DESIGN FEATURES M P L I F I E R 50.1 DESIGN FEATURES Page Tools Needed INSTALLATION CONSIDERATIONSPassenger Compartment Mounting BATTERY AND CHARGINGMOUNTING LOCATION S Trunk MountingWIRING THE SYSTEM USING PASSIVE CROSSOVERS Freq TABLE OF CROSSOVER COMPONENT VALUESSpeaker Impedance 6dB/Octave Low-PassLow-Pass USING THE XCARDCUSTOMIZING THE XCARD High-PassButterworth Alignment Q = XCARD RESISTOR CHARTButterworth Alignment Q = 1% resistors used with 0.047mF capacitors50.2 Power Connections Option #2 50.2 INSTALLATION50.2 Power Connections Option #1 Right Phase Switch set to Stereo OperationStereo/Mono Operation Left Phase Switch set toRight Phase Switch set to Bridged OperationEZ-BridgedOperation Left Phase Switch set toUSING THE 50.2 SIGNAL SWITCHING NETWORK 50.2 bypasses the circuitry of XCard 1 and XCard Pass-Thru uses output from XCard 50.2 uses output from XCard50.2 bypasses the circuitry of XCard Pass-Thru bypasses XCard 1 and XCard 50.2 uses output from XCard 1 and XCardConnecting the BLT USING THE 50.2 BALANCED LINE INPUTSAC Voltmeter set to AC Volts Level Setting the BLTPerformance Characteristics Disconnect Speakers from the– 26 – 50.1 INSTALLATION50.1 Power Connections Option #1 50.1 Power Connections Option #2Phase Switch set to Mono OperationPhase Switch 50.1 #1/2 set to XCard 50.1 #1/#2 set to Full Range Phase Switch 50.1 #1 set toPhase Switch 50.1 #2 set to Stereo/Mono OperationPhase Switch 50.1 #2 set to Bridged Mono OperationPhase Switch 50.1 #1 set to “Audiophile Bypass” the U S I N G T H E 50.1 SIGNALS W I T C H I N G N E T W O R K LOUD Configure a 12dB per octave filter for theXover is set to 12dB Pass-Thru has Full Range output onlyPass-Thru has Full Range output only Configure a 24dB per octave filter for the• Xover is set to 24dB Total Power Delivery RMS SYSTEM DIAGRAMS100 Watt System rated @ 4 ohms 400 Watts 150 Watt System rated @ 4 ohmsTotal Power Delivery RMS Tweeters400 Watts 300 Watt System rated @ 4 ohmsTotal Power Delivery RMS TweetersMidrange 500 Watt System rated @ 4 ohmsTweeters 400 WattsBalanced Line Transmitter FG-BLT ROCKFORD FOSGATE ACCESSORIESNOISE punch Energy Storage CapacitorsXCard Crossovers Remedy TROUBLESHOOTINGSymptom DiagnosisSpeaker Output Low SymptomDiagnosis RemedyLow or distorted output from the SymptomDiagnosis RemedyNoise Overview QUICK CHECK FOR TROUBLESHOOTING CAR AUDIO SYSTEMSAUTOSOUND 2000s PrefaceSummation Time for ProcessorsMusic DYNAMIC POWER MEASUREMENTSAbout the Dynamic Power Measurements What is an Amplifier?100Watts 200 Watts 50.2 SPECIFICATIONSSpecifications subject to change without notice 50Watts 90Watts 150Watts 300Watts 25Watts 50Watts100Watts 200Watts 400 Watts 50.1 SPECIFICATIONSSpecifications subject to change without notice 100Watts 200Watts 325Watts 650Watts 50WattsWhat is Not Covered LIMITED WARRANTY INFORMATIONLength of Warranty What is CoveredN F O R M A T I O N Habitáculo INTRODUCCIÓNUBICACIÓN DE LOS AMPLIFICADORES MaleteroOperación mono/estéreo ESPAÑOLMontage dans le coffre InstallationINTRODUCTION MONTAGETri-modeInput FRANÇAISOpération stéréo/mono Auf der Beifahrerseite EINLEITUNGEINBAUORT Im FahrzeugkofferraumStereo/Mono Betrieb DEUTSCHLinken Phasen Schalter auf 0 stellen Nel Bagagliaio InstallazioneINTRODUZIONE DOVE POSIZIONARLOFase sinistra dellinterruttore posizionata su ITALIANOStereo/Mono Operation MADE IN THE USA