During a state-funded restoration of a neglected 12th-century Hoysala temple in Karnataka's Tumakuru district, conservationists have identified two previously unknown subterranean chambers. These chambers, located directly beneath the antarala (vestibule), were found to be lined with unique, micro-perforated granite slabs designed to amplify specific acoustic frequencies associated with Vedic chanting. This discovery highlights the advanced architectural understanding of sound engineering present in medieval Indian temple design.
Archaeologists believe these 'resonance pits' were used during specific rituals to create a deep, humming echo that would vibrate throughout the main sanctum. The project, which was initially aimed at structural reinforcement, has now shifted to include a detailed acoustic mapping of the entire complex. Preliminary tests suggest that the resonance effects are perfectly calibrated to the low-frequency tones of traditional 12th-century liturgical chants.