paradigm studio 20 as center channel speaker

Thanks for the response. I tried it and found that I have to increase the db level of the center speaker (paradigm 20) to the highest all the time. Anything I am missing or incorrectly configured?
My gears: L/R: 40; Center: 20; surrounds: 20
NAD T753 Denon 2910

Please advice.
Thanks

Kal,
Yes I did use pink-noise and sound level meter first to set each speaker to the same level. When I watch movie, the dialogue seemed very weak and I have to bump up the center speaker db level.
Thanks

Kal,
It is in front of my TV on a Atlantis stand.
Thanks

Kal,
It is in middle of the front of the TV. barely blocking the screen. I am thinking if I need a bigger center speaker. My cutoff frequency is 60HZ, lower frequency goes to subwoofer. I set all the speakers to small.
Thanks