Audio Systems: split wires, corolla hatch, kicker amp

Question
i drive a 96' toyota corolla hatch, i have recently put in a new panasonic head deck, 2 2-way 4" panasonic speakers in the door, 2 3-way 6x9" speakers on the parcel shelf, i also run a kicker amp which powers my kenwood 12" sub in the boot. recently the voice coil in one of the woofers on one of the 6x9" broke so i bought another pair to replace it. that left me with 1 broken speaker and 1 new one. when talking to people they were saying that it was only the woofer that was broken, so i snapped off the mid range and the tweeter since it has its own separate wiring and they work fine. what i wanted to do was to put the speakers i got off the 6x9"s in the front doors as well, the 4"s being in the bottom left of the door, i wanted to install them in the top left. however, and this is my dilemma, how would i wire up the midrange and tweeter combo? the head deck is only 4 channel and someone suggested splitting the wires on the 4" speakers and power both of the same wire. how do i do that? in series or parallel? or is there even something i can buy that would let it be split?

Answer
ONE:  If you wire them in parallel with the bottom speakers you must know if the impedance is compatible with the amp.  If the amp is rated for 2 ohm load and the speaker impedances are 4 ohms, then you would be okey.

TWO:  If the speakers are the same sensitivity you would be okey by connecting them in parallel.  If there is a significant difference in sensitivity you may be better off adding another  amp so you can adjust the volume to allow a good balance of the sound pressure level coming from each system.

THREE: If there is no crossover in the midrange/tweeter combination you might want to add a series capacitor to keep low frequencies out.  Too much low frequency audio into the mid may cause its early demise - or at least too much distortion.

FOUR:  Additional amplifier would be relatively low cost and easy to install.  If you add lots of power amplification you could place a severe load on the electrical system of the corolla but I don't think you have reached that point yet.

Hope this helps.

C