SoundTube RF-41-20-SG Full range Blind-Mount Ceiling Speaker - 4" (White)The RF41 20 is a 4 inch, full range, blind mount, in ceiling speaker which delivers true high efficiency and performance across the operating bandwidth. The full range drive design deliveres maximun frequency response (71 HZ 22 kHz, 10 dB) in a compact design. Mounting hardware is included and features fast and easy retrofit connections. For easy ordering, stocking, and installation, the RF41 20 includes a five position tap switch for 25 ,70. 7 ,and