Rockford Fosgate 400x4 operation manual Mosfet Devices

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RTP (Real Time Protection)

NOMAD (NOn-Multiplying Advanced Decision)

The Punch and Power amplifiers use an analog computer process to maximize safe output power under all operating conditions. Rock- ford Fosgate pioneered and developed RTP (Real Time Protection), a crucial element in the performance edge of our amplifiers. The innovative NOMAD (NOn-Multiplying Advanced Decision) system is the most sophisticated version of this technique ever used, bringing previously unavailable levels of accuracy, stability, tem- perature immunity and reliability to this critical process. NOMAD makes advanced decisions based on device voltages to precisely control the awesome levels of current available in the output MOSFETs to safe values – but only when absolutely needed.

THE RESULT: Extremely fast protection system that always protects the amplifier and never degrades the sound.

MOSFET Devices

Rockford Fosgate is one of the few manufacturers in the audio industry to utilize MOSFET devices in both the power supply and the output stages. MOSFET (Metal Oxide Semiconductor Field Effect Transistor) devices offer several important inherent advan- tages over the 30 year old technology of bi-polar design. These advantages include: thermal stability, switching speed, ultra low output impedance and wider bandwidth linearity. In addition, MOSFETs operate very similar to vacuum tubes in which they are more linear than bipolar transistors. However, MOSFETs can deliver the midrange clarity without the limitations of transient response and high frequency phase shifting normally associated with tube operation.

THE RESULT: Operational characteristics similar to vacuum tubes without the performance limitations of tube designs.

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Contents Channel Amplifier Installation & Operation Manual Page Practice Safe Sound T T I N G S T a R T E D PU N C H 4-CHANNEL AM P L I F I E R AC C E S S O R Y PA C K T R O D U C T I O NRO C K F O R D FO S G AT E AC C E S S O R I E S Energy Storage CapacitorTransana TRANSconductance Active Nodal Amplifier Technical Design FeaturesXCard Internal Crossover Mosfet Devices Pass-Thru Output Design Features Amplifier S TA L L AT I O N CO N S I D E R AT I O N S Mounting Location R I N G T H E S Y S T E M Battery and ChargingPage Page I N G T H E Xcard Xcard Configurations Configure a 12dB/octave filter for the Front channelsConfigure a 12dB/octave filter for the Rear channels Configure a 24dB/octave filter for the Rear channels Configure a 12dB/octave filter for the Pass-Thru Channel Input Using the Signal Input SwitchRCAs connected to Front & Rear inputs BA S I C CO N N E C T I O N S Power ConnectionsChannel Stereo Operation Phase Switch set toChannel Mono Operation Channel Operation Input Channel Stereo/Single Mono Operation Channel Stereo/Dual Mono Operation Watt 3-Way System SY S T E M DI a G R a M SWatt 4-Way System RFA-414 2X-4 Pass-Thru RFA-414 2X-4 Amplifier does not TroubleshootingTurn on Amplifier has noLow or Distorted Speaker OutputNo Output on Rear ChannelsEngine Noise N a M I C P O W E R M E a S U R E M E N T S About the Dynamic Power MeasurementsMusic Listening to Loudspeakers Not ResistorsInformation Cubed What is an Amplifier?Watts 400X4 Specification SR R a N T Y I N F O R M a T I O N Page Page Rockford Fosgate