Hey everyone, I received a set of hand-me-down Infinity Quantum 4 speakers. The surrounds had basically evaporated so I purchased a kit off of ebay and replaced them, hoping that's all that would be required to get them up and running. Hooked up to my receiver, it seems that neither midrange driver is doing anything. Both mid range drivers measure 7.2 Ohms on the terminals so neither are an open circuit. I'm unsure how to test for any other issues with the mid range drivers. I see people suggesting to clean the potentiometers but do you need to remove them? Or soak them with pot cleaner in situ? I guess I have lots of questions. Is there some obvious reason that neither mid range driver would not be producing sound? I see a few big capacitors inside the cabs. Do they need to be replaced? Is there a way to remove/access the electronics? It looks like the whole thing is glued together permanently. Do the pots need to be removed to be cleaned? How do you get them out? Are there repair/troubleshooting tutorials that I've missed? Thank you for your assistance!