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That cone operates in the midbass and low midrange frequencies, which can be difficult to localize. Given that there's a fair bit of crossover between it and the woofer, it's understandable that it'd be hard to tell if it's making sound or not. More the expected. You can play the speakers and lightly rest your finger tips on the cone. You should feel it vibrating if it's working.

If not or only barely perceptibly (from sympathetic resonance), then you'll want to pull it and measure it. The AD5060/W8 has a failure mode that's a bit obscure. There's a joint between the tinsels and the voice coil leads that meet on the front of the cone and that spot where they're overlapped is prone to losing connection. The voice coil will be fine, but it'll still measure open because of that. You'll want to measure the DC resistance of the driver removed from the crossover if you've determined it's at fault. If open, scrape at a little bit of the lacquer at either end of those joints and measure the resistance across them to see if there's continuity or not. If not, scrape the rest of the paint away and lightly touch them up with solder and see if that fixes it. I've encountered this on one and I know someone else has as well. So, it's something to look for.