If you are concerned with the power for your home theater set up .... running a dedicated isolated grounded circuit would be a start.
This will be dedicated for the receptacles which your electronics will plug into .... isolated from any other items such as lights etc..
While this helps it doesn't guarantee issues from the supply panel .... inherent noise and fluctuations from normal things like A/C units , washers , etc..
Including a device for filtering and conditioning the power for the serious home theater will help with this.
As previously mentioned ....... an uninterpretable power supply ( UPS ) can be considered for the electronics..... though the battery back up power is really not the main concern .... some can offer power conditioning.
Generally there are 3 types of UPS systems :
standby (offline) .... Normally, power reaches loads directly from its source. During a power failure, a switch connects a backup battery to the load, with a short, distinct power interruption.
****** ...... provide load power at all times through a battery that is continuously charged by input power. The battery is always ******; therefore, no switching is called for during power failures.
- In "normal " mode there is really no conditioning and only provides surge protection the same as a power strip.
- Only when the battery powered inverter is active is when there would be any conditioning available ..... these I would not recommend.
****** UPSs provide complete protection and isolation from almost all types of power problems and provide digital-quality power that is not possible with offline systems. For these reasons, they are typically used for critical applications that demand high productivity and systems availability.
Line-interactive ..... retain some of the efficiency of offline UPSs while providing the voltage regulation features of ****** systems. Instead of converting the input power to DC and storing it in a battery, the UPS sends the power to the load through a ferroresonant transformer that provides voltage regulation and power conditioning for disturbances such as electrical line noise.
- "Double-converter system" is another name for an ****** UPS since it must convert AC input power to DC for charging the battery and afterward convert DC to AC for use by the load. Double conversion makes this UPS less efficient than other types.
****** systems provide the same benefits of an offline UPS combined with a line conditioner.
Obtain the wattage rating of each device. This rating should be listed on the equipment nameplate or in the owner‘s/operator’s manual or available from the equipment manufacturer.
If specified in VA, multiply the VA by 0.85 to determine the watts. If given in amps, multiply the amps by 102 to obtain watts.
Add the total wattage ratings for all devices to be protected .
Choose a UPS unit with a wattage rating equal to or greater than the total wattage requirements.
Example ....... If you have determined the demand to be 1,100 watts and the brand of UPS you have selected has only a 1,000-watt unit with the next model rated at 1,300 watts, select the 1,300-watt system.
Now having said all that .... there are some considerations associated with these systems.
Depending on the type and size the UPS must be installed with adequate ventilation for maintenance and operation. There will also be the battery replacement costs and handling .
Another option to consider is the power conditioning devices that can be purchased
at a retail outlet.
This type of equipment is designed to provide a constant voltage supply and provide conditioning by employing circuitry using a constant voltage transformer ( CVT ) along with filter components.
Just a thought.