help powering speakers

[BoostedA4203]

so tomorrow i plan to install my pioneer avic f90bt double din, bypassing the factory amp, but i am wondering how i will power all my speakers without installing a new amp..im wondering if the head unit will have enough wattage output to power at least 6-8...its 22W x 4 RMS output so for example im wondering if the radio will be able to power the front left door speaker and front left tweeter using only the front left speaker wire on the aftermarket harness (would be giving 11w to each speaker instead of the full 22w to one)...also im wondering if i could use a line output converter instead to allow the use of the front and rear rca inputs on the headunit.... anyone has any input on this id greatly appreciate it.