Rockford Fosgate 50.1, 50.2 manual Technical Design Features

Page 5
TECHNICAL DESIGN FEATURES

TECHNICAL DESIGN FEATURES

Many of the solutions to common design problems encountered by Rockford Fosgate engineers created entire new circuit designs as well as new ways to construct the Punch 50.2 and 50.1 Power Amplifiers. In our flagship amplifiers, no expense was spared in design and construction from the unique circuitry design to the manufacturing process that has proven to be the industry reference for many years. Described below are just some of the accomplishments achieved by our engineering and manufacturing staff.

trans•nova (TRANSconductance NOdal Voltage Amplifier)

The trans•nova (TRANS conductance NOdal Voltage Amplifier) is a patented circuit (U.S. Patent 4,467,288) that allows the audio signal to pass through the amplifier at low voltage. Each amplifier channel utilizes its own “fully floating” power supply and is configured to increase power gain. The increase in power gain allows the drive stage to operate at a lower voltage. A low voltage drive stage is the same principle used in high quality preamplifiers to produce high linearity and wide bandwidth.

E-I

I-E

 

trans•nova circuitry

The resulting design utilizes an output stage with a simpler gain structure and a shorter total signal path than conventional high voltage (bi-polar) designs. The number of stages is reduced from five or more to three. The output stage is further refined into a trans-impedance stage (current to voltage converter) to achieve a short loop (fast) negative feedback. The output stage is driven cooperatively by a transconductance stage (voltage to current converter).

THE RESULT: Superior sound quality, greater efficiency and higher reliability.

DIAMOND (Dynamically Invariant AMPlification Optimized Nodal Drive)

DIAMOND (Dynamically Invariant AMplification Optimized Nodal Drive - patent pending) is an important advance in circuit design which reduces high frequency distortion. Amplifiers which utilize a large array of output MOSFETs cause a high capacitive load on the driver stage. This load can make the high frequencies sound harsh. The DIAMOND circuit eliminates high frequency distortion by allowing the driver to operate with 20dB or more of current headroom, whereas traditional drivers have only 6dB of current headroom.

THE RESULT: Lower distortion and greater inherent stability.

TOPAZ (Tracking Operation Pre-Amplifier Zone)

The TOPAZ (Tracking Operation Pre-Amplifier Zone) circuitry solves ground loop noise problems common to automotive amplifier design. This innovative new development allows vastly improved isolation of the input signal grounds from the power supply ground of the amplifier. This is accomplished by allowing the source unit to control the potential “environment” of the entire input structure or “zone” of the amplifier. This process improves the noise rejection of the amplifier by 30-40dB

– an astounding 20-100 times better than amplifiers without TOPAZ.

THE RESULT: Elimination of troublesome ground loop noise between source and amplifier.

– 2 –

Image 5
Contents power powernew chrome heatsink 50.1PRACTICE SAFE SOUND G E T T I N G S TA R T E D TABLE OF CONTENTSPunch Power PUNCH AMPLIFIER ACCESSORY PACKINTRODUCTION TO 50 SERIES Punch PowerTECHNICAL 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 CONSIDERATIONSMOUNTING LOCATION S BATTERY AND CHARGINGTrunk Mounting Passenger Compartment MountingWIRING THE SYSTEM USING PASSIVE CROSSOVERS Speaker Impedance TABLE OF CROSSOVER COMPONENT VALUES6dB/Octave Low-Pass FreqCUSTOMIZING THE XCARD USING THE XCARDHigh-Pass Low-PassButterworth Alignment Q = XCARD RESISTOR CHART1% resistors used with 0.047mF capacitors Butterworth Alignment Q =50.2 Power Connections Option #2 50.2 INSTALLATION50.2 Power Connections Option #1 Stereo/Mono Operation Stereo OperationLeft Phase Switch set to Right Phase Switch set toEZ-BridgedOperation Bridged OperationLeft Phase Switch set to Right 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 INPUTSPerformance Characteristics Level Setting the BLTDisconnect Speakers from the AC Voltmeter set to AC Volts50.1 Power Connections Option #1 50.1 INSTALLATION50.1 Power Connections Option #2 – 26 –Phase Switch set to Mono OperationPhase Switch 50.1 #1/2 set to Phase Switch 50.1 #2 set to Phase Switch 50.1 #1 set toStereo/Mono Operation XCard 50.1 #1/#2 set to Full RangePhase 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 Xover is set to 12dB Configure a 12dB per octave filter for thePass-Thru has Full Range output only LOUDPass-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 Total Power Delivery RMS 150 Watt System rated @ 4 ohmsTweeters 400 WattsTotal Power Delivery RMS 300 Watt System rated @ 4 ohmsTweeters 400 WattsTweeters 500 Watt System rated @ 4 ohms400 Watts MidrangeBalanced Line Transmitter FG-BLT ROCKFORD FOSGATE ACCESSORIESNOISE punch Energy Storage CapacitorsXCard Crossovers Symptom TROUBLESHOOTINGDiagnosis RemedyDiagnosis SymptomRemedy Speaker Output LowDiagnosis SymptomRemedy Low or distorted output from theAUTOSOUND 2000s QUICK CHECK FOR TROUBLESHOOTING CAR AUDIO SYSTEMSPreface Noise OverviewSummation Time for ProcessorsAbout the Dynamic Power Measurements DYNAMIC POWER MEASUREMENTSWhat is an Amplifier? MusicSpecifications subject to change without notice 50.2 SPECIFICATIONS50Watts 90Watts 150Watts 300Watts 25Watts 50Watts 100Watts 200 WattsSpecifications subject to change without notice 50.1 SPECIFICATIONS100Watts 200Watts 325Watts 650Watts 50Watts 100Watts 200Watts 400 WattsLength of Warranty LIMITED WARRANTY INFORMATIONWhat is Covered What is Not CoveredN F O R M A T I O N UBICACIÓN DE LOS AMPLIFICADORES INTRODUCCIÓNMaletero HabitáculoOperación mono/estéreo ESPAÑOLINTRODUCTION InstallationMONTAGE Montage dans le coffreTri-modeInput FRANÇAISOpération stéréo/mono EINBAUORT EINLEITUNGIm Fahrzeugkofferraum Auf der BeifahrerseiteStereo/Mono Betrieb DEUTSCHLinken Phasen Schalter auf 0 stellen INTRODUZIONE InstallazioneDOVE POSIZIONARLO Nel BagagliaioFase sinistra dellinterruttore posizionata su ITALIANOStereo/Mono Operation MADE IN THE USA