Smoothing audio after filtering unwanted noise

I've been using SoundBooth CS5 for a few months and feel pretty comfortable with the basics. I can filter unwanted noise, trim, cut, splice, etc. But, I have found that on some occasions after filtering out noise, voices begin to sound, for lack of a better word, "tinny". Like the voice was recorded through a tin can. It is clear in the spectral analyzer that the voices were affected by the filtering.
Is there a way to add smoothness back to a voice clip? I've tried several of the equalizers, filters, effects to enhance male and female voices but it doesn't seem to reduce the issue significantly.
Thanks for taking a look at my issue, any help or thoughts are welcome.

Try Effects>Audio Filters>3 Band Equalizer.
This tutorial may assist:
http://www.kenstone.net/fcphomepage/basic_audio_filtertutoria.html
A third party appliczatin like Sound Soap could be a better solution than FCE filters. Try a trial on your clip.
http://www.bias-inc.com/products/soundSoapPro/
Al

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Sir please give me solution to this
i have a signal with phase,frequency n amplitude. To this signal i have added noise and i filtered that signal
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Attachments:
report(2).vi ‏89 KB

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Is there any possibility to count my items in my table after filtering?
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PWM- Sine.bmp ‏486 KB

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