Our basement flooded or at least got wet a couple times a year and I got sick of humping my audio equipment upstairs every time it happened (my cables also got wet and they're fine). We had french drains installed a couple years ago, which is basically a perforated pipe running along a trench that's dug along the perimeter of your basement (inside, not outside) and then covered. Haven't had a drop of water since. Any water that gets into the trench gets pumped out to the street by a sump pump. Not cheap, but a small percentage of what you've got invested in your stereo. I find the peace of mind alone is worth it, and it adds value to your house if you ever sell. Also have a secondary backup pump in case the primary pump fails and a battery backup in case power goes out, which it usually does. Our area's bad and we sometimes lose power for a week or more, so last year I installed a whole-house backup generator. Hopefully you don't have to deal with that, but I think you should seriously consider french drains given your system and basement situation (assuming you've got properly functioning gutters and no other issues that may be contributing to the water problem). Hope this is helpful.