Small red symbols: measured static compliance at the centre of the head of the Deering banjo, for different diameters of rigid indenter. Solid line is the prediction from ideal membrane theory, using the membrane tension listed in Table 1. Large red symbol: value of DC compliance deduced from the measured admittance using a hammer with a very small area of contact. Blue symbols. values deduced for a square loading region at the centre of a square membrane, with a cutoff frequency 10 kHz.