How would you add more speakers into a vehicle? Like, right now my vehicle has 4 speakers in it (like most do) and I was thinking of adding in two more speakers but, how would that be done with the wiring?
if you are powering them with the HU, i wouldn't reccomend trying that. but if you are using an external amp, you can wire the sets in parallel for a 2 ohm load (assuming they are 4 ohm speakers) which should still be within range for the amp.
honestly, its not necessary to keep adding speakers to get more or better sound though. just spend the money for a good set, install them well and power them cleanly.