Try swapping your left and right speakers over and see if the problem moves (ie if your speaker is dead).
This will at least isolate if the speaker is the problem or your head unit.
David
Mondeo ST24 Information Site yr 2000 silver Mondeo ST24 V6 MTX
mods: Custom alloy air intake using K&N RC-3250 air filter; Koni Sports shocks; rear 20mm Selbys sway bar; THF; EBC Greenstuff front pads, custom exhaust.
