Cdma, thanks for your response.
I don't own either of these. I have been using a Mac MR 78 for 15 years, and had recently heard good things about these two tuners. I was trying to decide whether I might want to switch to one of the Sansui's. I listen to the tuner more than any other source, and enjoy having one that really sounds good.
Cdma, I read on the High-endaudio.com website that the 9900 was excelent but was a little "dark sounding, so the ultra-highs may be rolled off." Does it sound that way to you?