How do they connect to a tv? Via an amplifier?
Yes via an amp. I bought a nice old Kenwood receiver amp for £40 on ebay and it runs these a dream. Old is gold as they say.
looks a lot more powerful than a soundbar and cheaper, how would they … looks a lot more powerful than a soundbar and cheaper, how would they compare? Is it just a matter of form factor preference?
Far better then most sound bars and the added option to place them further away for better stereo. Soundbars are just more compact. Its just personal preference.