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Turning an active speaker into a passive speaker ??

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  • Turning an active speaker into a passive speaker ??

    I'm interested in turning a Dayton 4" DA115 speaker into a passive speaker. Is this possible? My main objective is have the speaker cone for cosmetic purposes, however, if it's actually a usable passive woofer then that would be a bonus. The woofer, frame, and surround all need to be intact, I just want the magnet gone. Make sense?

  • djg
    replied
    You could cut everything off at the frame and smear a bunch of silicone caulk on the back of the cone to dampen its movement. Or a bit of spray on insulation foam (lighter).

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  • guitar maestro
    replied
    I have a 7x12" metal bandsaw that would slice off the magnet nicely.

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  • Paul O
    replied
    Originally posted by fpitas View Post
    In fact, it probably shouldn't share the air space with those big woofers at all.
    Because... in this case you would be creating an incorrectly tuned passive radiator that will just unload the woofers ruining bass output and potentially compromizing their power handling capability. At the very least it will flop around and make undesirable noises so even if you don't remove the magnet it should be sealed at the rear or you should short the voice coil.

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  • Grenadineflaps
    replied

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  • fpitas
    replied
    Yes, usually glued quite firmly. The iron pole pieces account for much of the weight, so you'd want to remove those, too. And even were it not for the glue, the magnetic attraction makes it dicey trying to remove it unless you degauss the assembly.

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  • Grenadineflaps
    replied
    Originally posted by fpitas View Post
    Well..there's no good way to take the magnet off that driver. And it won't be a useful passive radiator, for various reasons. In fact, it probably shouldn't share the air space with those big woofers at all.

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  • fpitas
    replied
    Well..there's no good way to take the magnet off that driver. And it won't be a useful passive radiator, for various reasons. In fact, it probably shouldn't share the air space with those big woofers at all.

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  • Grenadineflaps
    replied
    Originally posted by fpitas View Post
    Not to be contrary, but...that thing looks heavy. After all the effort to remove it, will you even notice the missing weight of the magnet? Maybe a pound or two?

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  • fpitas
    replied
    Not to be contrary, but...that thing looks heavy. After all the effort to remove it, will you even notice the missing weight of the magnet? Maybe a pound or two?

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  • Grenadineflaps
    replied
    Originally posted by Grenadineflaps View Post
    Maybe I should have titled this thread differently. I feel like people are trying to answer a question that I’m not asking. *My main objective is to remove that magnet from the Dayton speaker because I’m trying to reduce the weight of a portable speaker system. The system already has active speakers. The Dayton was used for cosmetic reasons, however is now adding weight to the client project. Sent from my iPhone using Tapatalk
    See the Dayton in the middle? I want the magnet gone, is it possible to remove it without cosmetically damaging the speaker?
    Sent from my iPhone using Tapatalk

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  • Grenadineflaps
    replied

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  • thekorvers
    replied
    You have not stated so, but I assume that you will have a second unit in your enclosure, this one actually electrically driven and functioning as a woofer. If not, your one unit will not be a passive radiator, but essentially a dead weight, not radiating anything! Are you trying to build a functioning speaker here?

    If you are installing two units with the intention of having one function as a passive radiator, I suggest you keep the magnet. In doing so you are able to install a suitable rheostat across the terminals of the "dead" unit and adjust the tuning.

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  • Grenadineflaps
    replied

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  • Paul O
    replied
    Just for clarity, If you remove the magnet from the driver you will have a totally non functioning speaker, yes it will be lighter but does that matter? if you just remove the amplifier from the cabinet you would potentially have a function passive speaker system... as long as the driver isn't blown of course.

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