Shiju,
The LUCAS system has all the eletronics (amplifier, crossovers)inside the subwoofer box. The system is suposed to be portable, but it weights about 60 Kg (+- 120 pounds) - has 4 wheels.
I really prefer these integrated compact systems as normally I play (and carry all the stuff) alone, but there are surely good less compact solutions (unpowered speakers + power amplifier), just like Dave suggested.