With flat response to 4,000 Hz and excellent low frequency extension, the GF180-4 6-1/2â glass fiber cone woofer from Dayton Audio is ideal for use in low cost 2-ways speaker designs. The naturally damped woven fiberglass cone is driven by a 4-layer voice coil wound on an aluminum former. This driver is a great choice for your next bookshelf speaker, multiple driver tower, or even portable sound systems.