Join Date: Dec 2006
Location: Brunswick Hills, Ohio
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The Zvox 555 is a great sound box. I use one in my secondary system and it's a big setup from my Panasonic Plasma speakers. It will never match a good 5.1 system, but the 555 has features that might enhance the listening experience for your parents, such as Dialog Emphasis DE and Output Leveling OL. It also has a Dolby Digital decoder and two digital inputs, so you can take advantage of enhanced sound from your DVD player and/or cable box. I don't believe however, it has the ability to pass a signal to a separate sub. Can't comment on the Polk, since I've never owned one.
The 430HD is more compact if space is a consideration, but it does not offer the above features such as DE and OL. It also doesn't have a Dolby Decoder, so no digital inputs.
Given the choice, I would go with the Zvox 555.