[Carl H.]

I would suspect your reeds first, as they are cheaper than my second guess - your mouthpiece isn't sealing.

 

[Carl H.]

Try rubbing the flat part of your reed, with the grain - lengthwise, on a piece of coarse paper - not sandpaper, just regular paper, like the inside of a paper music book cover. Be carefull not to damage the tip.

This can help make your sound cleaner.