I've got an old Acoustic 301 cab with a non original CV 187 in it at 4ohms. But the speaker has a rattle. It's like it's not all in one piece. But the cone moves and looks well except for the pushed in dust cap. During the 9V test the speaker extends fully in either direction but it sounds like static. This sound continues when it's properly wired up as well. Any ideas? Can it be fixed relitavely cheaply? Otherwise I've got a Carvin 18" loudspeaker that was in there when I got it. Sounds decent enough to me.