Oh, Watt Impedance???

Hi I have the problem that I have a subwoofer that should be driven with 2x4Ohm!Here are the data: Technical data: Frequency range 21-1000 Hz Impedance Loadability 500 watts Diameter 38cm Peak load capacity 1000 watts RMS chrome Flame design Double-swing coil Chrome-plated pole plate Foam bead 4 layered walkers Fiber Membrane 500 watts RMS 21- 1000 Hz up to 6.2cm Hub AW1571T 15 SubWoofer 38cm Flame Woofer 2x 4Ohm 60Oz Magnet 93,4 My amplifier has this data: · Sinus power at 4Ohm: 4x 50WRMS + 1x 150WRMS · 2 ohms load stable (with even more power) · total 700 watts maximum power (4x100W + 1x300W) · Tri-mode capable · frequency response: 5 – 24000 Hz · distortion factor. 0.05% · Cinch- (230mV – 8V) and high-level input · adjustable low-pass, continuously adjustable from 400-200 Hz. · Subsonic filter at 30 Hz with 24 dB · adjustable high-passes, continuously adjustable from 40-200 Hz. · MOS-FET PWM switching power supply. · 24-carat gilded connections · PTC overheating protection · Size approx. 215 x 65 x 460mm fits that or what do I have to take into account? Do I have to give something or another amplifier? Here comes number 2: What should have more watts of the amplifier or the boxes? What is an impedance? (Have heard the word about Car Hifi) Hope You can help me!