Kuyt

A little on my SL. My friend's old SP hiss very noticeably like the old iPods.

Do you think EQing would help, or even freezing it?

Blackstar

This issue has been discussed in depth in various other threads.

Applying an EQ process to the audio will not mitigate or fix it. In particular, do not use the spatialiser as that appears to increase the volume of the white noise.

The only method I know of reducing the white noise is to simply use a portable amplifier to clean up the signal. Perhaps using an impedance adaptor also works, but will make your music softer requiring you to turn it up more, hence less battery life.

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Current Rigs:
8GB iAudio 7 > Not in use
4GB + 32GB iAudio D2 > Alessandro MS-Pro
Sony MZ-NH1 > Headroom Total Bithead > Grado Labs PS-1
2GB Meizu M6 T1 > Not in use
8GB iPod Touch 2G > UE10 Pro