Rockford Fosgate P300-8P Car Single 8 Active Empty Subwoofer Box Only (NO SUB)#. WHAT’S IN THE BOX. 1 X Rockford Fosgate P300-8P Car Single 8 Active Empty Subwoofer Box Only. Rockford Fosgate P300-8P Car Single 8 Active Empty Subwoofer Box Only (NO SUB). Brand new EMPTY Active box only. Amplifier tested & working perfectly. High-Efficiency, Low Current Amplifier Design. 300 Watt Class-D Amplifier with Optimized “Closed Loop” Design. Adjustable 12db/Octave low pass crossover. On Board Phase Switch. Intelligent auto turn… Continue Reading ››