How big should center spkr be to set to "large"?

I'm confused, how about everyone else?

Small center channel with no sub and full-range LR's = big problem.

There is no good answer except work some overtime and get a subwoofer ASAP!

Are your left and right speakers Paradigms? If they are not then you must get the "matching" center for your speakers or you're designing your system all wrong and no setting is going to cover your mistake.

So what are the rest of the speaker? Lets fix your system right not patch a problem that goes much deeper than the bass response of your center channel.

Do we have an agreement to fix it correctly from the start?

Good Points CDW,

My solution would be get rid of the Paradign Center channel immediately, use phantom mode and pine for a Legacy Silver Screen I center channel. ($450 used?)

Best? you don't even have a shot at mediocre. The Paradigm and the Legacy speakers you have couldn't be more different and incompatible. (who recommended that combo anyway?) In your case no center channel is better than the combo you have.

Another cheap fix which I don't recommend but I know audio guys are, is to get the Behringer "feedback Destroyer EQ $89" and EQ the Paradigm to match the Legacy's better. But that's a longshot possible fix for you.

So start selling the Paradigm and searching for the SS1 then we can really help you when you've atleast assembled a system where our advice can matter.

We're not talking about $$$, were talking about Brown belt with black shoes.

If I'm correct the Paradigm is a $900 center channel? Which you should almost be able to swap for a used Silver Screen, it should be a even trade or +/- $100 at the worst.

I don't know how much the Silverscreen weighs, just know having one will make a huge difference.

"Could part of the problem be putting the center channel on top of the RPTV?"

Yes a little, but the main problem is a dramatic spectal balance mismatch between the main speakers and the center, further aggravated by there being no sub. Which I realize he cannot buy, and that's ok just swap the 570 for a Silver Screen should be a wash financially.

Also CDW with a sub in the system, many receivers will allow you to set the crossover at 40-60-160hz and the range can be covered at 1dB to 10dB intervals. A center like the 570 I would crossover somewhere between 50 and 60 hz.