what will happen when we keep the iron metials near the speakers or phones
Answers
Answer:
It depends safe against what.
An iron almirah would not be in the least directly dangerous to a laptop (just in case, you may want to place a wooden support a couple inches thick - but that's a very large, unnecessary and paranoid "just in case").
It would also be very effective against electromagnetic interference, even if I don't think it's likely that someone might send an EMP gun or vircator bomb your way anytime soon.
It would probably be completely uneffective, and actually probably counterproductive, in the event of a fire. A heated iron enclosure will warp and is likely to become un-openable, while being a good heat conductor and having low specific heat. As a result, whatever is inside will be exposed to almost the full heat of a fire with little chance of recovery. There are special insulating linings (also adhesive linings) that can be used to ameliorate this, and are basically made up of rock wool and aluminum foil sandwiches to stop convection, reduce direct conduction and block radiant transmission as much as possible. (This may be relevant from an insurance standpoint. I know of one case in which a damage policy paid less than it should have because the damaged goods were stored in a conceivably dangerous location. On the other hand, this happened in Italy - our insurers might sport larger shark fins than yours).
The "heat" part can be relevant for modern laptops because some components, such as SSDs, may experience a higher rate of failure if left at higher-than-normal temperatures for days on end, at least if they have become long enough in the tooth. Some kind of batteries, also, can "feel the heat".
If your main worry is about simple storage, i.e. adverse effects of the cold iron enclosure, just go ahead. As long as the laptop isn't powered by evil supernatural energies , you should risk nothing .
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