Rockford Fosgate 250.1 manual USING THE 250.2 BALANCED LINE INPUTS, Connecting the BLT

Page 27

USING THE 250.2 BALANCED LINE INPUTS

USING THE 250.2 BALANCED LINE INPUTS

The Balanced Line Inputs can be utilized with the optional Balanced Line Transmitter. Unlike standard RCA cables that use two wires to carry the audio signal and ground, balanced lines use three. In a balanced line, the output signal and its inverted replica travel down a pair of wires where the ground connects via the shield. As the amplifier receives the signals, it cancels out whatever signals are common to both wires. The use of balanced lines helps in preventing radiated noise pickup in the signal cables and has been proven effective in studio installation where long cable runs and magnetic fields make maintaining signal integrity difficult.

Connecting the BLT

–18V	+18V
– L. SIG	– R. SIG
+ L. SIG	+ R. SIG

SHIELD

Unbal.

R

L (Mono)

Speaker

0

°

-180

°

Bal.

Bal.

EZ - 180 ° - 0 °

Speaker

+

L

–

Bridged

Pass

Input

–

R

+

Gain

Thru

L

R

Gain

®		®

BALANCED LINE TRANSMITTER

BALANCED LINE	LED		INPUT
OUTPUT	LED	L	R

•Signal Input Switch to Balanced for Balance Line Input

•Gain for Left and Right channels set to minimum

CAUTION!! You must turn the gain controls to minimum when using the Balanced Line Transmitter. If the input gains need to be adjusted, this can now be done in the Balanced Line Transmitter.

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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