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Beovox s120 woofer

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RobM
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Cary IL
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RobM posted on Tue, Dec 1 2020 1:44 AM

Hi, does anyone know why there is a large hole that goes through the middle of the woofers magnet right up into the voice coil? I can see the interior of the dust cap through the hole. I am so curious about why it's there and what it does....

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Dillen
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It's a "ventilated magnet" design.
Size, coil design, magnet strength, cone and surround material etc...
It's all done to achieve the T/S parameters needed for this speaker (also why it is impossible to find decent commonly available replacements).

Normally one would put a twist of foam inside the hole to prevent dust and debris getting in there. Don't push it in deep, just let it block the entrance.
There isn't a lot of room between the magnet pole piece and the voicecoil, so any debris getting in there would be disastrous.

Martin

RobM
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RobM replied on Wed, Dec 9 2020 10:58 PM

Sorry it took so long to reply...  Thanks for the advice. I have just plugged the hole with foam careful not to contaminate it. will be ordering new surrounds for the speakers this week. Thanks again!

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