Wiring in one amplifier can be complicated enough, especially when you're dealing with a factory car stereo, and the situation just gets more complex when you add multiple amplifiers to the equation. You can wire two amplifiers, or even multiple amps, in one car audio system, but it takes some extra planning. The main factors that you need to consider when you wire in two or more amps are how you will deal with the power cable, grounding each amp, and whether or not the remote turn-on signal from your head unit is strong enough to split between multiple amps. The short answer is that you can use any number or combination of power amps in a car audio setup as long as you wire them in properly. The main proviso is that the charging system has to be able to provide enough juice in the first place. If you add in too many amps, and they draw too much power, you may need to upgrade your alternator or install a stiffening cap.
Installing a DIY Car Amplifier
How to Wire an Amp to a Sub and Head Unit: 12 Steps
Can You Wire in Multiple Amps, or Are Are You Limited to Just One?
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Most amps will come with a complete wiring kit. But if yours does not, you'll need the main power wire, an inline fuse use the size wire and fuse that the amp manufacturer recommends , a ground wire, RCA cables, speaker wires, remote turn-on wire and connector plugs to suit head unit, amp and speakers some units may just require bare-wire connections. The amount of space you have to work with will help determine the size amp you buy.