Richierich said:
There are many many reasons to buy a UPS that also has Automatic Voltage Regulation, Line Conditioning, Surge Protection along with Battery Backup because electronics do not like voltage surges and with Noise on the Line you can get Visual Artifacts, etc. and Rebooting is a PITA so I eliminated all of that years ago by installing Smart APC UPS Devices on all of my DVRs and Electronics and now I have No Problems.
A UPS such as you bought doesn't do much more than a surge protector does except in the cases where the power goes out. In other words, if it's not making that loud whirring noise (running its inverter), it's really doing as much as a good surge supressor would.
A device like a DirecTV box is far less sensitive to voltage surges than you would think. It's designed to deal with them, and it does. There's no reason at all to think that there's anything that an external surge supressor can do that cannot be done in the power supply of the DirecTV box, the only real thing an external surge supressor can do is be expendable. If a big surge comes along and overloads the supressor and destroys it, then you replace it cheaply instead of replacing the device plugged into it. If this happens, you'll know you saved money every time you replace your surge supressor. But when's the last time you had to replace a surge supressor because it died taking a bullet for your AV equipment? Me? Never. You? Probably not a lot I'd suspect.
The switching power supplies in a device like a DirecTV box (or a PC) can tolerate all kinds of awful power, it really doesn't care much, they can tolerate high voltages (many are even designed to use them continuously when used in Europe where the voltage is doubled) and even tolerate noisy power (switching power supplies generate so much noise internally that external noise doesn't add much to its task of making smooth output).
What they really cannot tolerate is low voltages. Put in 70V for 15 minutes and you'll blow out several electronic devices in your house. A compact fluorescent lamp uses a switching power supply. Plug one into a dimmer and dim it and just listen as the bulb power supply burns itself up. A UPS is very good for correcting this problem.
But the electric companies know this as well as I do or anyone does, so they try their hardest not to send low voltages like that. They know it's bad business. So unless your electric company does an especially bad job of it (some do), there's little to worry about.
In the last 20 years I lost more money buying and running UPSes than I saved in equipment damage. I lost more money from the equipment that
my high-quality APS UPS damaged by itself (note I'm not saying this will happen to you) than I ever saved in equipment damage.
If the direct impact of poor quality power (reboots and their delays) affects you, get a UPS. But getting one to save your equipment or make sure it doesn't mis-operate due to line noise is generally not necessary or even a bad idea.