In general, when trying to solve noise problems with digital equipment of any type you are working in the opposite direction than when trying to solve noise problems with analog equipment. (I am not talking about jitter problems, ) With an analog component you are trying to deal with noise already present on the power line. With a digital coponent the more likely problem is noise generated by the component, i.e. the noise is being placed on the power line by the component and that is what you are trying to defeat. The proper way to do this is via the design of the equipment itself.
In other words, if you truly have a noise problem that you can clearly hear, and you have switching components in your system, those very components are a likely candidate for the cause of the noise.
Any power conditioner that filters EMI will likely solve your problem. As many have said, this is a band aid approach. A better solution is to buy properly designed equipment or repair equipment that was properly designed but has since developed a problem.
In other words, if you truly have a noise problem that you can clearly hear, and you have switching components in your system, those very components are a likely candidate for the cause of the noise.
Any power conditioner that filters EMI will likely solve your problem. As many have said, this is a band aid approach. A better solution is to buy properly designed equipment or repair equipment that was properly designed but has since developed a problem.