Not sure, but I was able to return them even though it said non returnable. The first set of speakers I got stopped working after a minute. So I just called Amazon's amazing customer service and they said I could return and exchange it. Got the new ones last week through expedited shipping and haven't had any problems with them since. Great speakers!
Left Speaker: 7 5/8" tall, 4 1/2" wide (at the base), 4 3/4" deep. Right speaker same but a little deeper with its front knobs. Woofer: 11" tall, 11 3/4" wide, 9 1/4" deep + 3 wire connections at the rear (right side).
Yes, they will bring your TV to life. I have used them on a 46 inch and the sound amazing!
The speakers are self powered so make sure u turn off your TV speakers or way down.
If your hooking up to a 55 inch then you will have several ways to hook them up, they sell all types of adapters for your needs.
The bass really drives the sound. I would look into speakers that are all inclusive like a speaker bar or two satellite speakers with subwoofers built in like the Bose speakers that sometimes are bundled with laptops.