Digital BW, The Print

>... kind of results one could get using the K channel in the 
>2KBO setup as described by Clayton. 

The main issue most will probably have with the approach is that it is
grainier than the 200/220 with an inkset like the RR or K6.  I have not seen
a sample of the 3 picoliter 200 yet.  However, the 4 pl K2 printers like the
2200 are quite rough.  See page 9 of
http://www.paulroark.com/BW-Info/K2-Eboni-LK.pdf  Note when viewing that
page that that test patches are only about 2 mm high.  You can use these to
judge roughness by standing an appropriate distance from your monitor (if
you can get back far enough).

Whether it'll be smooth enough for you is subjective.

>Could it help cool down the tone of the print while at the same 
>time retaining some of the print quality advantages over the BO method?

It will probably not be cooler than a straight 200/220 K-only BO.  However,
that should be close to dead neutral on a paper like Premier Art 325.  See
the cart in my initial 2200 write up at page 2 of
http://www.paulroark.com/BW-Info/K2-Eboni-LK.pdf 

>Would the same settings be used with the primary and secondary 
>curves in QTR or would they need to be changed because of the 
>K channel's larger dot size? 

The highlights are better with only one channel firing.  So, start the
second (K position) channel outside the highlights.  You might print with
only the first one and see where it starts to band and start the second
channel very slowly just before that point.  In short, use the second one
only as needed to control banding.

Paul
www.PaulRoark.com