Archeo-acoustics Round-up

This article in Discovery Magazine covers a lot of what archeologists have been discovering about the acoustical properties of ancient sites, and then talks about one I hadn't heard of before in central Peru.

The most detailed evidence of ancient acoustical design comes from the Stanford team studying Chavín de Huántar, which was constructed between 1300 and 500 B.C. Peruvian archaeologists first suspected the complex had an auditory function in the 1970s, when they found that water rushing through one of its canals mimicked the sound of roaring applause. Then, in 2001, Stanford anthropologist John Rick discovered conch-shell trumpets, called pututus, in one of the galleries. The team set out to determine what role the horns played in ancient rituals and how the temple may have heightened their effects. Archaeoacoustics researcher Miriam Kolar and her collaborators played computer-generated sounds to identify which frequencies the temple most readily transmits. Over years of experiments, they found that certain ducts enhanced the frequencies of the pututus while filtering out others, and that corridors amplified the trumpets’ sound. “It suggests the architectural forms had a special relationship to how sound is transmitted,” Kolar says. The researchers also had volunteers stand in one part of the temple while pututu recordings played in another. In some configurations, the sound seemed to come from all directions.