UPS's and power conditioners..

I

iJeff

Limp Gawd
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Sep 1, 2004
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My speakers (Logitech z-5500) pop occasionally when another device in the room turns on/off. Not all the time, but enough to be annoying. Would a Line Interactive UPS with pure Sine Wave output be more suitable to fix this, or should I go with a home theater power conditioner?

These speakers are 500 watts RMS, and 1000 watts peak, so putting these on a UPS along with my PC and whatever else I plug in there would require a pretty hefty UPS.

I've used one of the calculators in the sticky and it said for _only_ the 450W PSU I have and the 500W Speakers plugged into the UPS, I would need at minimum 1300ish VA UPS, recommended was around 1600-1700VA. That's not including anything else I'd plug into it.

I'd be thankful for any insight on this.
 
wee96 said:
It could possibly be RFI and neither will work, just a thought.
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That's interesting. In my dorm room the speakers would pop when the mini-fridge turned on without fail. Are mini-fridges known to give off electromagnetic interference?

Actually, to think of it, it's probably not interference. All 5 satellites and 1 subwoofer "pop" the same regardless of where the "interfering" energy source is.
 
iJeff said:
That's interesting. In my dorm room the speakers would pop when the mini-fridge turned on without fail. Are mini-fridges known to give off electromagnetic interference?

Actually, to think of it, it's probably not interference. All 5 satellites and 1 subwoofer "pop" the same regardless of where the "interfering" energy source is.
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Its still possible, and I wouldnt rule it out. Any electronic device can give off EMI or RFI, some alot more than others or some which are defective, etc. If youve ever used a nextel phone near your speakers, youll see a prime example of RFI blasting all of them. It just seems unlikely that the noise is coming from the electrical lines imo.
 
I really hate speakers at times. :p

Is the item that is causing the problem with the speakers on the same circuit?
 
Spectre said:
I really hate speakers at times. :p

Is the item that is causing the problem with the speakers on the same circuit?
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Yes, both in the case of the mini-fridge and when my fan turns on.

Would electromagnetic interference cause the speakers to still make noise when they're powered off?
 
iJeff said:
Yes, both in the case of the mini-fridge and when my fan turns on.
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Ok try seperating them. I Know this might be difficult but for troubleshooting sake it would let us know a couple of things.

Would electromagnetic interference cause the speakers to still make noise when they're powered off?
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Well....what do you mean by off?
 
if it helps any, the speakers don't pop if they're muted digitally (but still powered on) when I turn my fan on and off.

plugged into another circuit via extension cord, the fan still in the same spot, the speakers don't pop.

the speakers still pop if I move the fan plug from the powerstrip to the other outlet in the wall outlet.
 
I thought I'd post an answer here just in case anyone was searching and found this thread.

The popping is due to a spike in power draw on the same circuit. The power supply in the amplifier of my Logitech Z-5500's is poorly designed, and thus doesn't deal with the power spike well.

An appropriate solution would be a UPS with pure sine wave output or a quality power conditioner, but some power conditioners I'm told are cheap and don't do much, so do your research.
 
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