Originally posted by: mrrman
I was told that you dont want a UPS on the DLP...I have a projector and use on a belkin line surge protector. I was under the impression that a UPS could actually damage the DLP in the event of a power failure. Correct me if I am wrong.
That's incorrect. The fact that a UPS is used is not a problem. The problem is the output of the cheaper UPS models.
Better UPS's, like the 750VA and above APC SmartUPS models put out a pure sine wave. That's what most electronics are designed for. The vast majority of UPS models put out what is called a square wave, or approximated sine wave. This is a very ugly square waveform. The switching power supplies in computers are equipped to handle this, but in general, electronics are not. Feeding them this kind of power a good way to shorten the lifespan of your electronics.
When we're talking about power amps (and even some receivers), that's a completely different issue. Powerful amplifiers can suck in incredible amounts of juice with transient manuvers. For instance, at 4 ohm, my Adcom GFA-7807 can output a maximum of roughly 600 watts per channel into all 7 channels. That's a total of 4200 watts. If you take a 15% line loss (very conservative), we're at 4830 watts. In short bursts, it can almost double that. There's no UPS my wallet can handle that can supply that kind of juice.