barrett@jhunix.HCF.JHU.EDU (Dan Barrett) (05/03/90)
CBM now sells these little stereo speakers to attach to an
Amiga's stereo audio out jacks. (Cost is about $30-40).
I have a question. Speakers generate magnetic fields. These
speakers are going to be near disks, since they are near computers.
Magnetic fields can erase disks.
Could someone (from CBM?) state SPECIFICALLY how far away from these
speakers I must keep my disks to be safe? Or is there no danger? Are the
speakers "shielded" in any way to prevent this magnetic field from getting
out?
I know I never worried about this with a speaker built into my
monitor; is this a different case?
Dan
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| Dan Barrett, Department of Computer Science Johns Hopkins University |
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\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\/////////////////////////////////////grr@cbmvax.commodore.com (George Robbins) (05/03/90)
In article <5126@jhunix.HCF.JHU.EDU> barrett@jhunix.HCF.JHU.EDU (Dan Barrett) writes: > > CBM now sells these little stereo speakers to attach to an > Amiga's stereo audio out jacks. (Cost is about $30-40). > > I have a question. Speakers generate magnetic fields. These > speakers are going to be near disks, since they are near computers. > Magnetic fields can erase disks. Little speakers have little magnets that generate little magnetic fields which become even littler in inverse proportion to distance squared. I suspect that you can't get close enough to the magnet due to the casework, but you might wish to experiment before you use the speakers for bookends for your diskette collection. -- George Robbins - now working for, uucp: {uunet|pyramid|rutgers}!cbmvax!grr but no way officially representing: domain: grr@cbmvax.commodore.com Commodore, Engineering Department phone: 215-431-9349 (only by moonlite)
ESDYKE@MTUS5.BITNET (Erick Dyke) (05/03/90)
You have a legitimate concern, if the speakers are not mag-shielded. But, your disks are the least of your problems, it is your monitor that can be damaged. When I bought speakers for my AV system I bought an AR subwoofer system with great mag-shielding, it is so well shielded I can wave it within inches of my screen with no screen flux. I would assume that since these new speakers are intended for use with a computer/monitor, I hope Comodore had the forsight to shield them. Everything with the 3000 so far would seem to show that they would do that. I hope I am right.......... Erick.
sjm@sun.udel.edu (Steve Morris) (05/07/90)
In article <90123.001803ESDYKE@MTUS5.BITNET> ESDYKE@MTUS5.BITNET (Erick Dyke) writes: >You have a legitimate concern, if the speakers are not mag-shielded. >But, your disks are the least of your problems, it is your monitor that >can be damaged. [...] I saw the 3000 and speakers at our users group meeting tonight. Considering the weight of the speakers I would say that they are not shielded. Also considering the weight I would say that they they don't need to be. They are very low power and must have a small magnet. They did not have a strong enough field to mess with the monitor (I didn't touch them right to the screen) so I can't see how they would have any effect on your disks. Steven Morris University of Delaware - Instructional TV sjm@sun.udel.edu
sparks@corpane.UUCP (John Sparks) (05/09/90)
barrett@jhunix.HCF.JHU.EDU (Dan Barrett) writes: | CBM now sells these little stereo speakers to attach to an |Amiga's stereo audio out jacks. (Cost is about $30-40). Is this $40/pair or each? | I have a question. Speakers generate magnetic fields. These |speakers are going to be near disks, since they are near computers. |Magnetic fields can erase disks. | I know I never worried about this with a speaker built into my |monitor; is this a different case? You should worry more about the fairly strong deguassing field that is activated everytime you turn on your monitor. It basically demagnitizes your screen when you turn the power on. The magnetic fields from the speakers are pretty weak. You would have to just about rub your diskettes on the speaker magnets in order to erase them. -- John Sparks | D.I.S.K. 24hrs 2400bps. Accessable via Starlink (Louisville KY) sparks@corpane.UUCP | | PH: (502) 968-DISK If you've seen one nuclear war, you've seen them all.
kim@beowulf.ucsd.edu (Geoffery Kim) (05/10/90)
In article <1793@corpane.UUCP> sparks@corpane.UUCP (John Sparks) writes: >You should worry more about the fairly strong deguassing field that is >activated everytime you turn on your monitor. It basically demagnitizes >your screen when you turn the power on. The magnetic fields from the >speakers are pretty weak. You would have to just about rub your diskettes >on the speaker magnets in order to erase them. Is there anyway of shielding against magnetism (other than the field strength is inversly proportional to distance rule?) I was considering building an inexpensive pair of speakers to put on either side of my monitor, but would like to avoid the convergence problems which result. +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | kim @beowulf.UCSD.EDU (Home of the Garden Weasles) | | "... ENGAGE!" -- Jean Luc Picard, STTNG | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
sterling@cbmvax.commodore.com (Rick Sterling) (05/10/90)
In article <10320@sdcc6.ucsd.edu> kim@beowulf.UUCP (Geoffery Kim) writes: > In article <1793@corpane.UUCP> sparks@corpane.UUCP (John Sparks) writes: > >You should worry more about the fairly strong deguassing field that is > > ... > > Is there anyway of shielding against magnetism (other than the field > strength is inversly proportional to distance rule?) I was considering > building an inexpensive pair of speakers to put on either side of my > monitor, but would like to avoid the convergence problems which result. > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > | kim @beowulf.UCSD.EDU (Home of the Garden Weasles) | > | "... ENGAGE!" -- Jean Luc Picard, STTNG | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Mu-metal speaker cabinets should work. ;-) __ __ |__) (__` | \ick ,__)terling ----------------------------------------------- Test Engineering Commodore Technology Group (215)-431-9275 UUCP ...{uunet,allegra,rutgers}!cbmvax!sterling