RGB Black conversion to CMYK

Hi,
Acrobat 9 is converting black I have set at R=G=B=0 in the original document to C=M=Y=0, K=100 (i.e. pure black) when I am converting the document to PDF (with the option to convert to CMYK selected).
Is there a way to force Acrobat to convert the original black to rich black in pdf, not pure black? And if so, how can I set the CMYK levels of the rich black it would be converted to?
I tried the Advanced>Print Production>Convert Colors, Promote Gray to CMYK and it did not affect the black area mentioned. I assume because although it was pure black, it was process black in CMYK rather than greyscale space.
Is there a way to achieve this?
(surprisingly, Acrobat 8 converts the same original document to a rich black where the black has components in all 4 colours CMYK)
Thanks.

Hi
"I'm sorry, is not enough to English"
This problem for correct "primarily RGB color space add  document"
I am prepared add video lesson... wait me

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