Rockford Fosgate 250.1 manual Using Passive Crossovers

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NOTICE!

10.Perform a final check of the completed system wiring to ensure that all connections are accurate. Check all power and ground connections for frayed wires and loose connections which could cause problems from road vibrations.

11.After the final inspection is complete, install the power fuse and enjoy listening. During the initial listening period, you may need to “fine tune” any phasing and level settings within your particular vehicle. To aid in this procedure, play a track with high musical content and cruise around your neighborhood. After fully evaluating the transient response of your system and making any final adjustments, all your neighbors within a 1 mile radius will assume that you have just successfully completed another upgrade to your audio system for which they will probably spill thumbtacks on your driveway.

NOTICE!

Amplifiers using the trans•nova topology improve in sound quality after warming up. We recommend operating the 250.2 and 250.1 for approxi- mately 15 minutes prior to evaluation under judging criteria or tune-ups to establish its normal operating temperature.

* Your friends will call it MAGIC, you can call it Rockford technology! *

USING PASSIVE CROSSOVERS

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A passive crossover is a circuit that uses capacitors and/or coils and is placed on speaker leads between the amplifier and speaker. The crossover delegates a specific range of frequencies to the speaker for optimum driver performance. A crossover network can perform one of three functions: High-Pass (capacitors), Low-Pass (inductors or coils) and Bandpass (combination of capacitor and coil).

The most commonly used passive crossover networks are 6dB/octave systems. These are easy to construct and require one component per filter. Placing this filter in series with the circuit will reduce power to the speaker by 6dB/octave above or below the crossover point depending on whether it is a high-pass or low-pass filter. More complex systems such as 12dB/octave or 18dB/octave can cause impedance problems if not professionally designed.

Passive crossovers are directly dependent upon the speaker's impedance and component value for accuracy. When passive crossover components are used in multiple speaker systems, the crossover's effect on the overall impedance should be taken into consideration along with the speaker's impedance when determining amplifier loads.

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Contents 250.1 powerpower powerPRACTICE SAFE SOUND G E T T I N G S T A R T E D TA B L E O F CO N T E N T SPunch Power INTRODUCTION TO 250 SERIESPunch Power trans nova circuitry TECHNICAL DESIGN FEATURESDIABLO Dynamically Invariant A-BLinear Operation TOPAZ Tracking Operation Pre-AmplifierZoneStereo Pass-Thru DSM Discrete Surface Mount TechnologyXCard Internal Crossover Balanced Line Inputs NOMAD NOn-MultiplyingAdvanced DecisionITS Increased Thermal Stability 250.2 DE S I G N FE AT U R E S PLIFIER 250.1 DE S I G N FE AT U R E S 1AMPLIFIER Tools Needed INSTALLATION CONSIDERATIONSEngine Compartment Mounting BATTERY AND CHARGINGTrunk Mounting Passenger Compartment MountingW I R I N G T H E S Y S T E M USING PASSIVE CROSSOVERS Freq TABLE OF CROSSOVER COMPONENT VALUES6 dB/Octave High-Pass 6 dB/Octave Low-PassLow-Pass US I N G T H E XCARDCU S T O M I Z I N G T H E XCA R D High-PassButterworth Alignment Q = XCA R D RESISTOR CHARTButterworth Alignment Q = 1% resistors used with 0.047∝ F capacitors250.2 INSTALLATION 250.2 Power Connections Option #1250.2 Power Connections Option #2 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 toPage XCard not required Pass-Thru uses output from XCard 250.2 uses output from XCardPage Pass-Thru Configurea12dBperConfigurea24dBperoctave and“AudiophileBypass”the filterforConnecting the BLT USING THE 250.2 BALANCED LINE INPUTSDisconnect Speakers from the Level Setting the BLT8.0 VAC Performance Characteristics250.1 INSTALLATION 250.1 Power Connections Option #1250.1 Power Connections Option #2 Mono Operation Phase Switch set tominimum orFullRange AmplifiersPowerStereo/Mono Operation Impedanceforeachstereochannelshouldbe2Ω minimumImpedanceforbridgedchannelshouldbe4Ω minimum Pass,-High -LoworPass RangeFull Bridged Mono Operationminimum Impedanceforbridgedchannelshouldbe4ΩU S I N G T H E 250.1 SIGNAL S W I T C H I N G N E T W O R K“Audiophile Bypass” the TUNE Configure a 12dB per octave filter for theXCard LOUDConfigure a 24dB per octave filter for the SY S T E M DI A G R A M S 250 Watt System rated @ 4 ohmsTotal Power Delivery RMS Total Power Delivery RMS 500 Watt System rated @ 4 ohms450 Watts 750 Watt System rated @ 4 ohmsTotal Power Delivery RMS TweetersWatts 1000 Watt System rated @ 4 ohmsTotal Power Delivery RMS TweetersROCKFORD FOSGATE ACCESSORIES NOISEBalanced Line Transmitter FG-BLT Channel B monitors right channel Punch Status Display FG-PSDPunch Status Display connected to one Channel A monitors left channel1.0cap punchEnergy Storage Capacitors XCard CrossoversRemedy SymptomTR O U B L E S H O O T I N G DiagnosisSpeaker Output Low SymptomDiagnosis RemedyLow or distorted output from SymptomDiagnosis RemedyNoise Overview QUICK CHECK FOR TROUBLESHOOTING CAR AUDIO SYSTEMSAUTOSOUND 2000s PrefaceSummation Time for ProcessorsMusic DY N A M I C PO W E R ME A S U R E M E N T SAbout the Dynamic Power Measurements What is an Amplifier?450 Watts 250.2 SP E C I F I C AT I O N SSpecifications subject to change without notice 180Watts 310Watts 620Watts 125Watts 225Watts1000 Watts 250.1 SP E C I F I C AT I O N SSpecifications subject to change without notice 420Watts 710Watts 1420 Watts 250Watts 500 WattsWhat is Not Covered LIMITED WA R R A N T Y IN F O R M AT I O NLength of Warranty What is CoveredN F O R M A T I O N Habitáculo INTRODUCCIÓNUBICACIÓN DE LOS AMPLIFICADORES MaleteroOperación mono/estéreo Montage dans le coffre InstallationINTRODUCTION MONTAGEPage Im Fahrzeugkofferraum EINLEITUNGEINBAUORT DEUTSCHStereo/Mono Betrieb Linken Phasen Schalter auf 0 stellenITALIANO InstallazioneINTRODUZIONE DOVE POSIZIONARLOFase sinistra dellinterruttore posizionata su Stereo/Mono OperationMADE IN THE USA
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