I have two 115 Yorkville Elite subs, they are both having extreme problems. They are used at a local bar where I work and need to fix them for Wednesday if I can, if not I'll replace the speakers. I am sure it is the cabinets themselves that aren't working correctly. The first makes a farty blown sound but is usable. Is it the grill rattling? No. Is it the speaker not mounted tightly enough? No. Is there any stress/cracks/rips in the cone? No. What else should I look at? The second does not work altogether, no noise. Are the wires disconnected? No. Battery test? Yes, it worked. Where do I go next?