I aquired some l300 recently and one of the LE 85 midranges produced no sound. At time of aquision a small 3" midrange was attached to the le85 leads which did produce sound. I also took the diaphragm to my local speaker guy who confirmed the bad diaphragm. I then found a replacement driver, installed and no sound from it. While hooking a small 3" (surround speaker8ohm) to the leads there was no sound. Any advice, repair facility is greatly appreciated