Then you may not know that applying noise reduction in Audacity is a two step process:
First you have to select a region of the audio which is only noise to capture a noise profile, then click on “Get noise profile” to capture it … http://manual.audacityteam.org/index.php?title=Noise_Removal
After you have captured the noise profile, select “Noise removal” again from the “Effect” menu, then select the region of audio you want to reduce the noise and click on preview, (typical settings are 10dB for noise reduction, 500Hz for frequency smoothing, and 0 for attack decay time).
If the recording is voice (rather than music) the minimum bandwidth for good quailty speech is around 200Hz - 5000Hz, (will sound like a telephone),
300 - 3000Hz is about the least you can get away with for intelligible speech (will sound like poor telephone connection)
[ BTW your glowfoto.com photos aren’t visible in your posts ]