Subwoofer Near UPS

Try it and see.

Haha.. Thanks for your brilliant answer!

I think subwoofer & UPS will not affect each other.. Any advise?

Yes. Try it and see.

Yes, Yes, try it and see, try it and see

One good experiment is worth a thousand theories.

You don't like experiments? You'd prefer, instead, to take someone's word for it? Their opinion? Someone who isn't even there, on-site, just so long as you're convinced they're an 'authority' of some kind - whether they are or not? How would you know?

We can speculate all day about this, model the problem on the world's fastest supercomputers, shove fistfulls of cash into the bank accounts of legions top-dollar electromagnetics consultants, and you - and they - would still need to do an experiment to find out if any of it was worth a bloody wooden nickel.

If you don't try it, you'll never know!

I have.. And nothing happened.. Or i cant detect if any changes on it.

I ask here because i need explanation from you all as electrical engineers, of course based on your theory.

I don't know the characteristic of UPS: its inverter, its rectifier, its battery, etc.

So, what if my subwoofer is nearby the UPS? Will it affect my UPS, i mean in terms of more noise in electrical current so that can affect my Power Supply or perhaps affecting in transfer time (if my UPS is offline type) so it needs more time to transfer from primary source to secondary source, etc..

Thank you..

Thanks!

It is highly doubtful that either device will affect the performance of the other to any significant degree. Highly doubtful.

The reason subwoofer manufacturers single-out monitors is that, in the Bad Ol' Days the word 'monitor' meant 'contains a CRT.'

CRTs - cathode ray tubes - depend on the precise control of electron beam trajectories to paint images on the screen. Moving electrons are very sensitive to magnetic fields. Stray magnetic fields will tend to change the beam direction to something less appreciated by the user, and subwoofers provide plenty of field. A big magnet placed near a CRT spells trouble. Besides screwing with the electron beams (a color CRT uses three), a strong field - such as from a sub - can permanently magnetize and even mechanically distort a sensitive CRT component called a 'shadow mask.' If that happens, the CRT is permanently hosed. It cannot be repaired.

Thankfully, LCD (and coming soon, LED) monitors do not have this aversion to magnetic fields. CRTs will soon be history, and good riddance I say. You still want to keep your sub away from your computer, because disk drives don't like stray magnetic fields either.

Thank you Sir for your explanation about CRT interference caused by subwoofer.

According to your explanation about CRT: how it works, etc, so i assume that my subwoofer will not affect my UPS so much, because UPS component is different than CRT, and we can not find any electron beam in UPS as in CRT.

Yes. maybe it needs more time to research/experiment more detail (as you suggest above) regarding to this matter to see small changes, i don't know maybe using oscilloscope to check the sine wave, noise, etc when subwoofer is activated nearby.

By the way, thanks Sir.. I really appreciated with your replies.

My pleasure.

A UPS is a pretty rugged device from a 'magnetic' standpoint. As the magnetic field from a sub is a 'static' field - in the sense that it is not changing over time - it can have little effect on the components inside a UPS. About the only component that a static magnetic field can affect is the transformer, and that field would have to be many times stronger than the field produced by your sub to even begin to have an effect. To be a problem, the field would have to be strong enough to cause the transformer core to 'saturate' during part or all of the A.C. cycle. However, if a field were present having this strength, you can be damn sure there'd be other problems than just with your UPS. Like your stove sliding across the floor and sticking to the sub and not the other way around?

In short, you're doing fine. You can duct-tape your sub and your UPS together if you want to. If you want to. It wouldn't make any difference if you did.

If you have a sub with a magnet powerful enough to saturate your UPS' transformer core, I'll buy it from you at ten times the price.

That would be one badass magnet.

No worries, mate. You can stop worrying about it now and put in some good music, sit back and relax. Your UPS will be fine.

Your sub-woofer has been designed to minimize leakage flux, not because they are interested in the performance of your UPS or a CRT, but because they are interested in giving maximum performance and efficiency to the sub-woofer. Most CRTs are shielded from magnetic fields and won't be affected by any but the strongest fields, Your UPS is not shielded because it doesn't require shielding. Any interaction between stray magnetic fields and your UPS will disappear when the units are separated. The conclusion is that there is not likely to be interaction, but if there is, it will only while the two units are in close proximity. So, feel free to test.

My UPS and subwoofer have been getting along next to each other with no arguments whatsoever for seven years now. No worries.

Mmm, the expert person to ask and get sensible answers from is Mr John Lennard Burnett, a custom HF builder, consummate educator and believer in all 'good knowledge needs to be free'. He is the Great Guru of electronic sound for the 'informed and intelligent' at the moment, and has been for a very long while.

Burnett is very approachable, answers all email personally, and can be found through www.lenardaudio.com (The site is amazing for those that are interested enough to seek and find, as it exposes all the myths, and has enough information on it to keep a serious audio addict in a state of exaltation for a long while).

Most modern subwoofers are magnetically shielded. This does not imply that they are totally shielded; just that measures have been put in place to minimise the stray magnetic field, which is quite strong. A strong magnetic field can interfere with a CRT's picture, distorting it by deflecting the electrons from their intended paths. Also, the tube assembly can be permanently magnetised, causing discolouration. Some CRTs have a degaussing coil that demagnetises the tube on turn-on or by user input.

The subwoofer's magnetic field will not affect the UPS.

I agree. There are no components in the UPS that would be affected by the subwoofer even if it wasn't shielded.

I always like putting magnets on people's monitors and listening to the calls to the IT guys. These LED monitors just aren't as much fun....

Actually most "shielded" speakers are actually field cancelled. They typically use an additional cancelling magnet to make a net zero magnetic field outside of the cabinet. This prevents the magnetic field from emerging through the speaker opening. You can't put a shield over that opening or the sound won't get out very well.

Most of what I get as far as offending electrical beeps and buzzes, is from wireless as far as your speaker goes check the specks and check specs on UPS. What do they recommend, if you can't find your answer there or here call Liebert they should know.