Car Speakers

All i know is that amplifairs are one of the main control of the volume in speakers and woofers, but is there a limit to how many speakers and woofers can be connected or added onto the amplifiar? or can you buy extra cables and and such for your amp to control more? if so, do people buy 2 or 3 amps just so that they would have more speakers and woofers in their car and is that common these days?

Technically there is no limit but there will be in terms of power.a 1000 rms watt amp will best push 2 500 watt rms subs...or 4 250 rms subs...or even a single 1000 watt rms sub...lets say you get an amp capable of pushing 2000 watts rms and you put 4 500 watt rms subs on it.that would be some serious power and if the equipment is name brand.some serious sound quality and loud volume to back it up...if you ask me the only limitations will be 1. available wattage power2. money to pay for all that(most likely including a battery,alternator and electrical system upgradethere are amps available that are capable of putting out 7500 to 15000 watts rms but even then those are expensive so it may be smarter to get a couple of 1000 watt amps..the best you can do is to match rms output of the amp to the rms handling limit of the subs..an underpowered sub does not sound the way it should and an overpowered one will be destroyed in extreme heat( easy to do) and finally be sure to pay attention to wiring diagrams in accordance with the the number of subwoofers/speakers, their individual impedances and their final impedence load once the circuit is completed to the amp