> Hit it with a hammer?
Hit your brains.
What does a speaker do?
Take electricity and move.
Take the speaker out.
Push gently on the cone center. Compare with a good speaker. It should move, stiff but without scrape. If it has been hit with a hammer, the Alnico slug has busted loose, sucked itself to the pole, clamped the coil. Recentering the slug is possible, use wood wedges to work it to the center then hard against the C-frame. Since you can't easily re-glue it, it will always be fragile. Since you can't clear all the glue-flakes from the C-frame, it won't be up to full strength.
Ohm the terminals. Is it like 7 ohms or is it infinity (or under 1 ohm)? If no-go, look for the break. There's flex-lead soldered into the lugs, the flex hates solder. Sometimes it is globbed-on enuf to work 30 days or 30 years, then tarnish gets all the way through the non-joint and it goes open. The flex rarely fails (in 10-watt jobs like this). There is another joint where the flex hits the cone-paper, flex soldered to voice-coil ends then covered with glop.
If you can get ON the fine voice-coil leads (through varnish) and it still reads open, the coil is broken inside. That's common on higher-powered jobs. Cut it all apart, you see that the high power softened the coil glue, the high forces shot half the coil off the end, stopping when the fine wire broke and all abuse ended. That's not reasonably repairable. In this low-power job, it may be decades of copper corrosion finally ate through the fine wire.
Topic: The Columbia (Read 4740 times)