<HTML>In a message dated 7/11/2002 4:31:37 AM Pacific Daylight Time, mfarrel2@tampabay.rr.com writes:         Dittos Terry.     I Know of no on using less crown in the treble. At least many are using 60ft. thru out and many of us increasing radius into  the treble. I think the confusion is that a 60 ft. curve on a 40 inch rib appears to have proportionally more crown (7-8 mm) than a 15 inch rib with a 25 ft. curve ( 1.5mm) when observed visually. >>>>>Dale Erwin>>>>>>>> <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">> Like rib radius it seems to be that less crown is > desired in the treble and more in the bass. Depends on how you are measuring crown. If you measure by how far the soundboard bows from a planar surface, you are looking for more crown in the middle of the board. From a manufacturing point of view, crown is more commonly measured by the radius of curvature one tries to build into the finished product. In that case many board designers are generally putting more crown in the treble and less in the bass. Some put the same crown across the whole board. </BLOCKQUOTE> </HTML>