Altering the frequencies of the plates

[Herman]

On my latest guitars I measure the top and back frequencies. On some of them the top is quite close to the back resonance. What to do in such a situation?

Second thing: When a top resonance (with the top attached to the sides) is a bit too high, lets say 220 Hz. And I want it to get it below 200HZ, What do you do to lower that response?

Thanks
Herman

[John Parchem]

Some nylon string guitars are built with the top and back on top of each other. It could lead to a wolf note at the frequency as the low impedance quickly drains the energy in the sting. It is easier to lower a resonance than raise one.

For top not yet finish, thin the top or the parameter. Reach a hand in and lower the braces. Add some mass to the top, can try with blue tac putty under the bridge.

One way to separate the top and the back is lower the top if there is room.

[Herman]

Thanks mate, I already thought that, but it is always nice to have a second view.
Herman