ahh that's good then. Also good for others to know in case they have one.
Mine are JBL's and they recently changed the design too so they can do away with the rubber 'o' ring. They've re-designed the distribution plate so there's no need for the 'o' ring now. They're much better without it. Far less fiddly to seal up and they've made it so you can convert the older design to the new design. I have one that's about 2 years old and I converted it recently ... much much better