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It sounds odd, but smell the bass port (the hole in the cabinet). A burnt, acrid smell indicates the speaker was pushed too hard and the electronics may be fried. 3. The "Battery Pop" & Listening Test

Inspect the ring around the woofer (the surround). If it is made of foam, check for "foam rot"—cracking or crumbling. This is common in speakers over 15-20 years old but can often be repaired. buy used speakers

Gently (and evenly) push the woofer cone inward. It should move smoothly and silently. If you feel or hear a "scratching" or "crunching" sound, the voice coil is likely damaged or rubbing. It sounds odd, but smell the bass port