You must remember that 'volume' is logarithmic. This means that if you are wanting more volume, to get twice as loud as a 100W amp you have to increase power by a factor of ten. Thus a 1KW amp will only get twice a loud as a 100w amp. Using that increase in power means that your speaker systems need to be able to use that power without failing. Their impedances would also have to allow the amp to supply it's maximum power.
The amp I use for my bass is a Class D Stereo power amp fed by a tube pre-amp I built for that purpose. My cabinets are Acme Sound B2 models. Impedance is 4Ω each. I connect them one each channel in a vertical 4x10 configuration. If I use all four of my cabinets, my amp will supply 1000W per channel at 2Ω.