Rockford Fosgate 40ix - Manual (Page 9)

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◆ XCard
(Internal Crossover)
The Punch and Power amplifiers utilize internal active crossovers.
These crossovers have many performance advantages such as using
discrete 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
modifications, 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.
◆ MOSFET Devices
Rockford Fosgate is one of the few manufacturers in the sound
community 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
advantages 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 and vacuum tubes share many important
operating characteristics. However, the MOSFET device is much
faster, wider in bandwidth, measurably lower in distortion and far
more linear than vacuum tubes.
THE RESULT: Operational characteristics of vacuum tubes
without the performance limitations of tube design.