DOES ANYONE KNOW HOW TO ACCESS THE CROSSOVER OF THE SONUS FABER ELECTA? I HAVE A PAIR THAT HAVE BEEN IN STORAGE FOR 15 YEARS. THEY ARE IN IMMACULATE CONDITION BUT UNUSABLE BECAUSE ONE OF THE MIDWOOFERS IS BLOWN. THE OTHER DRIVERS ARE FINE. I CAN GET A REPLACEMENT FOR THE BLOWN MIDWOOFER (SCANSPEAK 18W/8545-01, I BELIEVE) BUT I SUSPECT THE PROBLEM LIES WITH THE CROSSOVER BECAUSE REPLACING THE OTHER WORKING MIDWOOFER WITH THE BLOWN ONE STILL GAVE NO RESULTS. PROBLEM IS THE CROSSOVER SEEMS SEALED.....