1. Put the speakers directly face to face
2. Wire one of them out of phase relative to the other.
3. Play a 10 to 20 cycle tone (sine wave). Continuous play.....or use a signal generator.
4. Turn the volume up till the woofs are moving a lot but not distorting.
5. Do this for 100 plus hours (4 days or more straight).
6, Enjoy
You will not hear the speaker while doing this. The tone is really too low to hear....but mainly, the cancellation of the wave via inverting makes it have no sound.
This will not hurt the tweeter as it is crossed over at 12 db per octave at 1000 cycles........However, if you are a conservative type then you can desoler the red wire going into the tweeter. From a pic shown here it is in plain sight and would take 10 seconds to desolder or resolder.
What you want is for the woofs to move....since its the suspension/spyder that need loosening up.
The above will take you most of the way there....but the tweeter, wiring, caps, resistor and coils still need higher frequencies to make the most love (please, burn me in, baby).....so, play them loud occasionally with full range music.