domed dish

[Jorge Bertholdo]

Usually the domed dish have it's deepest point at the center (of circumference).

What if the deepest point is at the place where would be the bridge on the top (and/or back)?

Is there any acoustical consequence positive or negative?

regards

Jorge Bertholdo

[kiwigeo]

Dishes have maximum depth at the centre but when I position my tops/backs on the dish the area between the rear of the soundhole and the bridge area is close to the centre of the dish.

I would say the most important thing is to make sure that the doming is such so that neck/upper fretboard geometry is not compromised.

[Trevor Gore]

If your dish is a spherical dome, it doesn't matter where you build the top in the dish, the outcome will be the same.

If your dish is non-spherical, the outcome depends on the actual shape, but most normal shapes (mildly out of flat) don't deviate sufficiently from being a dome to make a significant difference.

If you build in a solera, more complex shapes with reflex curves can be and often are used. Typically, the "top of the hill" is placed ~50mm-60mm in front of the bridge to avoid a hollow forming in that location due to the torque on the bridge. The "top of the hill" on a spherically domed top naturally falls at the mid point of the length of the top, which happens to be ~60-70mm in front of the bridge.

Another generality is that the more curvature there is, of whatever type, the stiffer the the geometric properties of the structure, which will slightly favour the reproduction of higher frequencies.

As Martin points out, make sure that whatever curvatures you use, you achieve the correct neck geometry with the correct action at the 12th fret and the correct string height above the soundboard at the saddle location.

[Jorge Bertholdo]

Thanks Trevor and Martin, very helpful information.

cheers

Jorge Bertholdo