Noise is audio frequencies. The sound you want to listen to is also audio frequencies. If you filter out the noise frequencies then you also filter out the sound frequencies you want, then you hear NOTHING!
Maybe you should explain the problem you have where the sound is not clear. Is it distortion?
Also describe the noise. Is it low frequency hum? Is it high frequency hiss?
You can filter out the hum but then you also filter out all low frequencies in sound which kills any bass sounds and causes voices to sound like chipmunks.
You can filter out the hiss but then you also filter out all high frequencies in sound which muffles the sound.
If you filter out both low and high frequencies then the sound is narrow band like a telephone.
A steep band-notch will greatly attenuate powerline hum, and a variable gain de-emphasis (like the old Dolby "B") can attenuate, but not fully eliminate hiss.
Distortion and interference occur in a cheap poor quality circuit. Get a better circuit.
I do not listen to music on an AM radio, instead I use an FM radio.