The Tiwa community is one of the autochthonous communities of Northeast India. An important aspect of Tiwa culture is the erection of stone monuments during the celebration of Chongkhong Phuja. This ceremony is performed before the commencement of their yearly agricultural cycle which falls in late April and continues to early May. https://www.roneverhart.com/Turbosound-TS-18SW700-8A-18-Low-Frequency-Loudspeaker-p31480/