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The above (if it works! I am not very computer savvy) is not a really good pic' but the best I can find quickly. See the tags? If you blow the picture up you might just see a rivet and on the left, jeeeust a wire curling under the connector board? That is one of the pigtails, very flexible braids that carry current to the voice coil.
Sorry for the technicalities Robert but a spark plug is a spark plug and a sump plug...You get my drift? We HAVE to call things by their names.
No one can point to the exact cause/location of the fault. Starting at the woofer you go back to the X/over (if there is one) then the power amp feeding that (could be a dry joint in that causing a high pass filter effect) . Is there any response modifying switching on the back? Another possible source of trouble...PLUS! A ll the connectors in the line! Crimped spade connectors CAN be badly done, if that proves the case try squeezing it with BI Mother pliers. You COULD try solder but there is always the risk of it flooding the receptacle and rendering it bog useless.
Some pictures would help us point you in fruitful directions.
Dave.