unscrew gently , lay the Mids driver down , tighten the 6 screws of the top plate until they are snug tight , the driver is composed of 2 halves sandwiched between a rubber gasket , a loose top cover can cause vibrations or an irritating sound .
an Ohmmeter can pinpoint to a problem with the driver's diaphragm if the resistance reading is way off between both drivers , typically a good k-55 diaphragm should measure from 9 ish to 10,5 Ohms , anything lower than 9 Ohms indicates a worn out diaphragm , the replacement is a breeze 15 minutes with a soldering iron and a flat screwdriver