I have a Pioneer HU which has the Mosfet built into it. Printed on the HU is "MOSfet 45X4". Is this Mosfet some sort of amplifier? Would this "45X4 MOSfet power" be the same as having a 4 channel 45x4 amplifier in the car? Or would i be wasting my money to buy a new seperate amp? TIA

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Agron
1989 300E
Monotoned Smoke Silver
97 Style Replica E420 Rims 205/55/16
Euro Headlights
Clear Corners
20% Tint
12" Sub-enclosure