Speaker info;
Coaxials---One unit, (multiple speakers), supplying full range sound, (can be 2way, 3way or 4way)....
2way coaxials;
Components---Multiple seperate units, (components), supplying full range sound, (can be 2way or 3way)....
These generally consist of a passive crossover, mid bass driver & tweeter, a 3way set will include a mid range driver, so 3 seperate speakers per side....
3way components;
The addition of the seperate crossover network gives greater control & hence quality over simple coaxial speakers....
If your after decent bass from the front end alone, then I would advise a set of 3way components, amplifier driven & mounted in deadened & sealed front doors....
Most after market components are designed to be ran in conjunction with some form of sub, they simply won't reproduce low frequencies....