Digital BW, The Print

I previously wrote:
>Clayton
>
> I went to try BO and had a little problem because my workflow is
> different to yours.
> I got a print that was way too light across the entire tonal range.
> Is it a problem with Qimage sending RGB output to the printer for
> BO, rather than a grayscale image?

I think I realised what happened.  Only the black plate after
conversion to CYMK got printed.  Can I fix this with a different ICC
setting, or do I have to send real grayscale files to the printer for
BO, rather than just monochrome RGB ones?

F_P