How to replace a woofer in a beovox model B&O speaker. They commonly rot out, and it's an easy fix, as long as you aren't an anal retentive B&O fan who wants everything original. I chose to replace mine with Goldwood 8" woofers, about $17 each, available at partsexpress.com. They now sound fantastic! :)
Beovox S55 Bang and Olufsen Woofer Replacement (easy)
Step 1: Check your woofers, mine were shot
B&O typically uses really crappy foam suspension on their woofers which rot out in a 5-15 years. Mine were shot, so I ordered new goldwood woofers to replace them. Just be sure they're about 8" in diameter, and more than 6.4 ohms (the original impedance of the freaking weird woofers they used). This shot is after I had already taken them out.
Lay speaker on it's back. Use a phillips to remove 6 screws holding the entire plastic speaker face onto the cabinet. Seperate. Lie the black plastic faceplate on the ground, with the speakers facing down. Snip the wires to your woofer, as closely to the woofer as possible. Remove the 4 phillips screws holding the clamps onto the woofer. Now, compare your old woofer to your sweet new one!
Step 2: Modify your new speakers for B&O use!
Bang and Olufsen doesn't do anything normally. Special fancy speaker cables, stupid expensive turntable cartridges, they don't even mount their drivers inside their speaker cabinets normally. Instead, they use a clamp system (normal speakers use screws or bolts). Whatever replacement woofers you bought, chances are they have holes along the edges for mounting them like most normal people. Unfortunately, those holes are not in the original speaker, and they'll allow bass and sound to exit from inside the cabinet if you install them that way. Luckily, there is a simple solution:
Silicone! Just squeeze some silicone caulk into the holes, and even it out. It doesn't have to be perfect, as it's soft enough to conform to the cabinet.
Step 3: Modify foam batting
Your new woofer will probably have a bigger magnet than the wimpy B&O one, so trace it with a marker, then cut it out.