Come to think of it, I haven't retested my system since I replaced the 2.4s with the 2.7s so it's been over 10 years. The place where I bought my speakers is who originally came to my home to test and set up my system way back when, but they're no longer in business. Should I try to find someone else to do it? How hard would it be to do the testing and re-calibration myself, and what would I need? I can borrow an SPL meter, standard one from Radio Shack I believe, from my brother-in-law (I think he still has it) but nothing else and no test CD. What test CDs have people here used? If someone can point me to a good site or discussion topic that shows what I need and how to set it up, I would greatly appreciate it. I'm always willing to try something new, or at least take a look to see if it's beyond my capabilities and get someone else to do it!