Sound Board Crown

[John W. McKone]

Ed Writes:
>
>     I  think of the crown and downbearing as two components of an acoustical
>containment and production system. In this sense,  they cannot be viewed as
>separate.

I agree completely Ed.  However, I think it is important to seperate the
two components in the diagnostic phase.  In the end though we are trying to
create a single, integrated, sound producing device.

I also second the notion of being careful not to flatten the sometimes
delicate crown on older boards by over doing the bearing.

As to plate flexing - have you noticed the amount of flex on some of the
Baldwin's from around the 40's.  I've run into a few where the tail of the
plate sits about a 1/4 inch above the dowels with the bolts removed.  I've
seen enough of these that it almost seems like it was a factory approach to
setting bass bearing at that time.

By the way, its John - not Tom. : )

John McKone, RPT
St. louis Park, Minnesota
(612) 280-8375
mckonejw@skypoint.com