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Thread: Subwoofer near computer case, what's the real risk? Reply to Thread
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  Topic Review (Newest First)
06-07-2013 02:07 PM
aroc91
Quote:
Originally Posted by pheria View Post

I didn't have a real compass to test with, so I tried to use the compass feature on my phone. It seems like within 4 +/- 1 inches from the sub is enough to interfere with my compass. So that gives me an extra inch or so to the bottom of my case, and the hard drive isn't even mounted on the absolute bottom. I think the magnetic field is dropping off quickly enough.

Compasses are pretty easy to interfere with. The Earth's magnetic field has a strength of ~45 µT. My Z2300 sub maxes out at 1700 µT on the top. According to this, degaussers have a coercivity (not measured in teslas like magnetic field strength, but related) starting at 5000 Oe (oersteds). Somebody else pointed out that a ferrite magnet with a coercivity of 2000 Oe has a strength of 0.4 T, so my sub is 235X weaker than a magnet that's even weaker than a degausser. All things considered, I'd say it's safe.

http://superuser.com/questions/568336/what-is-the-tolerable-magnetic-field-in-tesla-for-a-hard-disk
06-07-2013 10:22 AM
Masta Squidge
Quote:
Originally Posted by TwoCables View Post

Yeah, well I don't listen when someone corrects me in a confrontational way.
That isn't our problem.


That being said... I am still curious as to why you seem to think there is a difference between a "powered" subwoofer, and a "non-powered" subwoofer.
06-07-2013 08:13 AM
ramicio It will be fine. Hard drives have stronger magnets in them and right next to the platters. A ferrite magnet on a speaker a few feet away aren't going to do anything to a hard drive. I'd be more concerned for a hard drive seeing that kind of vibration.
06-07-2013 07:44 AM
pheria Warning in manuals may not be evidence, but I think they're still worth mentioning in this context.

That being said I appreciate the information from everyone a lot.

The distance between the top of my sub and the top of that end table is about 6 inches.

I didn't have a real compass to test with, so I tried to use the compass feature on my phone. It seems like within 4 +/- 1 inches from the sub is enough to interfere with my compass. So that gives me an extra inch or so to the bottom of my case, and the hard drive isn't even mounted on the absolute bottom. I think the magnetic field is dropping off quickly enough.

I'll have to test out vibrations and see what those are like next.

Thanks again for the experience and information.
06-06-2013 11:11 PM
TwoCables
Quote:
Originally Posted by Mygaffer View Post


It 100% will not effect your drives. I have taken an electromagnet used for wiping old school video tape and ran it over a hard drive, did nothing to the data, I also took a very strong rare earth magnet and ran it over a hard drive, again, nothing the data was completely intact.

The only thing an un-sheilded speaker might damage is a CRT display, and even that is not permanent.

Well reading the rest of the thread looks like we have all come to a consensus. I like TwoCables but you did one thing I hate, and that is believing something with no evidence and when evidence to the contrary is pointed out. The word for it is magical thinking. We are all pretty left brained people here, we hopefully rely on facts and science (i.e. testing it out). I've tested it out and modern hard drives are just not vulnerable to any kind of magnet that you would normally have around your house.

 

Yeah, well I don't listen when someone corrects me in a confrontational way.

06-06-2013 11:10 PM
TwoCables
Quote:
Originally Posted by tsm106 View Post


rolleyes.gif


Wrong.

 

I said that it may be shielded. I didn't say that it is. What the hell?

06-06-2013 10:54 PM
DaveLT
Quote:
Originally Posted by Mygaffer View Post

Sounds like there is a story behind that one. Did someone say this to you?

If so you should have said, "are you asking me to stick my drives where the sun don't shine?"
Yeah, during a lecture. Of which i replied "Where the sun don't shine you'll be asking me not to put my drives?"
Let's just say the lecture ended prematurely and i got another negative rep point again tongue.gif
06-06-2013 10:24 PM
Mygaffer
Quote:
Originally Posted by DaveLT View Post


It's just like the nonsense you hear while taking IT diploma that they would say "Keep harddisks away from sunlight as that has magnetism"

Sounds like there is a story behind that one. Did someone say this to you?

If so you should have said, "are you asking me to stick my drives where the sun don't shine?"
06-06-2013 10:02 PM
DaveLT I store a couple of HDDs very near a classic 8" JBL sub with ginormous magnets for a 8" ...
Nothing happened. Keep in mind that magnet is powerful is enough to nearly overwhelm a neodymium magnet that you find in harddisks @ 1/2 INCH!

It's just like the nonsense you hear while taking IT diploma that they would say "Keep harddisks away from sunlight as that has magnetism"
06-06-2013 09:50 PM
nvidiaftw12
Quote:
Originally Posted by Mygaffer View Post


It 100% will not effect your drives. I have taken an electromagnet used for wiping old school video tape and ran it over a hard drive, did nothing to the data, I also took a very strong rare earth magnet and ran it over a hard drive, again, nothing the data was completely intact.

The only thing an un-sheilded speaker might damage is a CRT display, and even that is not permanent.

Well reading the rest of the thread looks like we have all come to a consensus. I like TwoCables but you did one thing I hate, and that is believing something with no evidence and when evidence to the contrary is pointed out. The word for it is magical thinking. We are all pretty left brained people here, we hopefully rely on facts and science (i.e. testing it out). I've tested it out and modern hard drives are just not vulnerable to any kind of magnet that you would normally have around your house.


+1

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