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Apple got a lot of stick before ios5 as their EQ reduced the volume.
If you wanted Bass Boost for instance you would maybe raise the 20, 80, 120hz points by 3db, however, what the iPod did was lower everything else by 3db, so you were not getting more bass but less of everything else.
It did this as the iPod has a really low power output so there was nothing left in reserve, but reducing the gain was a bit of a problem as it was then too quiet a lot of the time.
From iOS5 they now do raise the curve rather than drop it, but if your recording is already at the limit it will clip (distort), and most commercial stuff these days is already pushed to the limit, if not beyond.
Turning on the Sound Check brings it back to how it was previously.
I don't think the EQ worked on the line out in ios4, but not 100% on that.
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