Rockford Fosgate Punch P400X4 4-Channel Amplifier JBL holds their external crossovers

JBL holds their external crossovers to the same standards as the rest of this speaker system

Amp Phase Shift Variable 0-180 Degrees

EPIC Boost: Frequency Center: 30 Hz to 80 Hz

the 2 Channel High/Low Converter with Digital Bass Enhancer that will transform your car audio experience forever

Dual Stacked High Flux Y30 120oz Strontium Ferrite Magnets

Rockford Fosgate Punch P400X4 4-Channel Amplifier JBL holds their external crossoversThe P400X4 is perfect for 4 way front stage rear fill or 3 way front stage subwoofer systems. Simply drop a pair of component speakers on the front channels and subs on the rear and BOOM you got "The PUNCH." With its flexible design, the P400X4 is an excellent amplifier choice for virtually any vehicle. FEATURES AT A GLANCE 12dB octave Butterworth crossover High level input capable with Auto Turn On circuit Features C. L. E. A. N. Set up On board