This is not an alternator whine or noise that is caused from a poor ground.
The noise he is refering to is the low level hiss you hear between the songs.
This is almost impossible to get rid off completely and largely becasue its already there in the recording from the recording equipment. Some recordings are better than others. On a CD look to see if its DDD, ADD, AAD type of recording on your cd.
AAD - analog recording, analog mixing, digital transfer;
ADD - analog recording, digital mixing, digital transfer, and;
DDD - digital recording, digital mixing, digital transfer.
A good DDD recording will generally have the least noise.
Your system will also generate some level of noise, everyones will to some degree. When you have your pre-out levels matched to the amplifier this greatly reduces the amount of hiss your system will produce. This is why having higher voltage pre-outs are very desirable. The higher your pre-out voltage, the lower the gains have to be set on the amplifier. The lower your gains are set on your amplifier, the lower the noise and more efficiently your amp will run.
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To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be.
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