One of my wife's RT55 bookshelf speakers stopped playing bass. There is no visible damage to the drivers, and at no time were the speakers overdriven. I read somewhere where it could either be the crossover of the woofer, and I did switch the L & R to be sure there wasn't another issue. B I also read that it could either be a woofer or a burned-out crossover, but I can't get the speaker open to find out. Seems it has a strange kind of hex screw, and I cannot find the right tool to open it with.
Any ideas or suggestions on what it could be or what to do? The speakers are seven years old, and out of warranty.
Oh yeah, she does not have them bi-wired, but one of the jumpers are missing. It's been playing just fine without it, but could that have any bearing on the situation?
Any help is appreciated. Thanks!