Rockford Fosgate PUNCH 4020 DSM - Manual (Page 8)

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◆ XCard
(Internal Crossover)
The Punch 4020 amplifier utilizes internal active crossovers. These
crossovers have many performance advantages such as using dis-
crete components for exact frequency adjustments which are far
superior to potentiometers. Additionally, the
XCard can be config-
ured for high-pass, low-pass and full range operation. With slight
modification, many crossover frequencies and slope configurations
can be achieved.
THE RESULT: Increased system design flexibility with a precise
electronic crossover without the limitations of conventional poten-
tiometer designs.
◆ RTP
(Real Time Protection)
NOMAD
(NOn-Multiplying Advanced Decision)
The Punch 4020 amplifier uses an analog computer process to
absolutely maximize safe output power under all operating condi-
tions. Rockford 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, temperature immunity and reliability to this critical pro-
cess. 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.