Adjusting the phase of the subwoofer will not do anything for lip synch. The AVR should handle that. What you need to do for lip synch is what kikkenit2 said -- adjust the delay setting in the Pioneeer.
If you think the phase of the sub is off, the easy way to adjust is to play a test tone at the crossover frequency (you can download test tones and use your PC to play them, or burn a test CD, or buy one). Adjust the phase knob on the sub for the loudest sound at the listening position. That ensures the sound from the sub and other speakers is adding, not subtracting, at the crossover frequency. That is where it matters.
"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley