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The level of bass did in fact get somewhat lower at the lowest(0,1)settings and this effect seemed to be over by the median 3 setting, with essentially no change between 3 and 6. I then ran mid-range tones up to 1KHz(played entirely by the speakers, of course)and observed essentially the same effect of a somewhat lower level at the 0 and 1 Dimension settings.



Thanks for doing that. At least now I know that it's not me, my environment or my system. Let me experiment with it too to see how the level is affected from 3 to 6.

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The lowest settings aren't frequently used for ambience steering...



I'm not sure what you mean by this. The lower the dimension setting, the greater the ambience (the greater the surround field).

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...and if when they are used the volume decrease is noticeable(isn't noticeable to me when playing actual music)then the volume control could be raised slightly.



I actually noticed this effect when playing music. I have to raise my volume significantly in order to improve the bass.