I strongly suggest burning in the speakers for atleast 100 hours before you decide on the SQ being better or worse. Recommended time is 200 hours of burn-in.
BTW - speakers cables are also prone to burn-in, therefore its a good idea to let the system be for sometime.
Best idea would be to find a pink noise, white noise and sine wave samples online and burn them onto a CD to aid the burn-in process.
PS - 50 hours of burn-in on my Sennheiser CX-680 opened the lows and highs, while adding to the dynamics. I am BIG fan of the burn-in process.