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Old voice coil as dummy load

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monkeypuzzle View Drop Down
Young Croc
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    Posted: 10 July 2020 at 7:19pm
Am i right in thinking I can do this? I've got some battered old who knows what drivers of about 4-600w with 3" VCs that are taking up space. At the most I'm dumping 190w into them. I'm just thinking of ripping it out and desk mounting it and maybe putting an old computer fan on it.

Is this a daft idea?
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M4trix View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote M4trix Quote  Post ReplyReply Direct Link To This Post Posted: 10 July 2020 at 8:46pm
What ? You can't find a 4-8R/300W resistor ? Tongue
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Post Options Post Options   Thanks (0) Thanks(0)   Quote monkeypuzzle Quote  Post ReplyReply Direct Link To This Post Posted: 10 July 2020 at 10:22pm
Originally posted by M4trix M4trix wrote:

What ? You can't find a 4-8R/300W resistor ? Tongue

Tongue I’ll take that as a just go ahead, what’s the worst that could happen Tongue
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Digbethdave Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2020 at 3:04am
What drivers are you going to hack up? 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2020 at 6:24am
Just make sure that you don't overheat them. Your standard large dummy resistor comes on a former which helps dissipate the heat. Likewise the coil and the speaker magnet, etc.

You could fit the coil on some sort of heatsink - and definitely add a fan or two.




Edited by Earplug - 11 July 2020 at 6:25am
Earplugs Are For Wimps!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote monkeypuzzle Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2020 at 9:52am
Originally posted by Digbethdave Digbethdave wrote:

What drivers are you going to hack up? 

Just some un branded pressed steel things that are probably at least 20 years old. 

We have a sheet roller at the workshop so I’ll roll an ali tube to sit snugly inside with a fan to cool. Cheers.
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odc04r View Drop Down
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I wouldn't personally, unless you potentially don't mind losing whatever was connected to them under test if they melt. Voicecoils are not the hardiest things even with cooling.

If you dumped them in a bucket of oil they'd be ok.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2020 at 10:41am
Originally posted by odc04r odc04r wrote:


If you dumped them in a bucket of oil they'd be ok.


For frying chips?  LOL


Earplugs Are For Wimps!
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Peter Jan View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Peter Jan Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2020 at 9:57pm
Originally posted by Earplug Earplug wrote:



For frying chips?  LOL


Yup and if you put enough power through that coil, you probably could really fry chips in it LOL


Edited by Peter Jan - 11 July 2020 at 9:58pm
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njw View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote njw Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2020 at 11:26pm
Originally posted by odc04r odc04r wrote:


If you dumped them in a bucket of oil they'd be ok.

 ^^This, chuck them in a bucket of old engine oil, if engine oil can dissipate heat in an internal combustion engine which has an actual fire inside it then a voice coil shouldn't cause a problem... :)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote M4trix Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2020 at 11:47pm
Originally posted by njw njw wrote:

Originally posted by odc04r odc04r wrote:


If you dumped them in a bucket of oil they'd be ok.

 ^^This, chuck them in a bucket of old engine oil, if engine oil can dissipate heat in an internal combustion engine which has an actual fire inside it then a voice coil shouldn't cause a problem... :)


But...but without water cooling the engine would blow its top ! Ouch Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote njw Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2020 at 11:57pm
Originally posted by M4trix M4trix wrote:

Originally posted by njw njw wrote:

Originally posted by odc04r odc04r wrote:


If you dumped them in a bucket of oil they'd be ok.

 ^^This, chuck them in a bucket of old engine oil, if engine oil can dissipate heat in an internal combustion engine which has an actual fire inside it then a voice coil shouldn't cause a problem... :)


But...but without water cooling the engine would blow its top ! Ouch Wink

 Quite right, although if there were no oil in the engine it would die a lot quicker than if there were no coolant in it...
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