How about a 3Kva Online Double Conversion UPS to run the Entertainment system, TV, Sound, PS3 and Media 'puter. Plus 2 more smaller models for other puters and the phone sytem in a wired and wireless networked house.
I don't get NO POWER HUM or weird clicks on my 12" woofer ...
( The 3Kva is slightly under utilised [17%] but if we ever have a power cut I'll be able to boil a jug or two
)