Breakin in Gas audio Gpp 6.5 subwoofer bass sweeps 3 hours

I have 2 Gas audio 6.5" subwoofers, but the one was almost never use and was superstiff compare to the other one.. so i gave it some hours with bass sweeps to loosen it up so it would syncronise with the other subwoofer in same enclosure since it got a new one. it helped a lot.
I use a online youtube bass sweep track for the job.
#gasaudio