Abstract: The invention concerns a resonance box for tonal amplification of a string instrument acoustically connected therewith, in particular one being supported by means of an end pin. This type of resonance box should be configured in such a fashion that it facilitates a significant resonance effect which can be heard and felt and amplifies the sound of the corresponding string instrument in that region in which the tonal spectrum is weaker. This is achieved in that the resonance box (1) is acoustically optimized through choice of material, shape and sound holes (2). An advantageous embodiment provides for configuring the resonance box in a compactable fashion to assume a reduced volume.