That's odd since CDs have a MUCH greater signal to noise ratio.
As well as much greater channel separation, of course.
I recorded from lp onto disc and the soundstage shrank big time.
What was doing the A/D conversion? Quality A/D conversion is technically more challenging (and more expensive) than D/A conversion of similar sample rate and resolution, and also can require a good deal of care to get a clean analog signal into the converter.
the naim just doesnt present a very wide or deep soundstage in comparison to my turntable
Just a wild guess, but are you sure you have absolute phase correct through the cd path? If any of the components in that path invert absolute phase (meaning they invert the polarity of both channels), I'd imagine that might have some effects on perceived soundstage.
Regards,
-- Al