What type of nomalization does Soundcheck do?
Reply #5 –
My suspicion is that its less likely to be peak normalisation. I usually have it on though I read on ipodlounge that turning it on will drain your battery more. (I doubt it is that much to be easily measurable)
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You really shouldn't believe everything you read. Especially not anything you read on iPodLounge.
Turning on SoundCheck will, in fact, make your battery last longer in the vast majority of cases. Although the difference will most likely not be truly measurable. The reason for this is simple: SoundCheck usually has the effect of reducing the volume on most tracks. It doesn't have a large amount of wiggle room to raise the volume, but it has a huge amount of room to lower it, and this is what it generally does. Lower volume = less power used = more battery life. Simple.
Anybody telling you that SoundCheck drains the battery is on crack.
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It could definitely lead to greater battery usage due to having to "crank" the volume higher to hear reduced tracks.
Also, I believe soundcheck is very closely related to the replaygain algorithim(s).