How do I determine if the problem is just in the tweeter (woofer, mid, etc) and not the crossover?
Start by trying to isolate the problem. If one side has no high end, remove the tweeter and replace it in the other good sounding speaker cabinet. If the tweeter then works there, you have determined the problem is most likely in the crossover or wiring. If one whole speaker side is not working, try switching the right for the left wires at the amplifier connection. If the same side is not working, then the problem is most likely with the amp. If the bad speaker switches sides, then the problem is in the speaker. When in doubt, contact us for more info.