The TC620i is a mid-range in-ceiling loudspeaker from Polk Audio, available in singles or pairs. Like the TC610i, the 2-way, 125W TC620i features a single 6.5" driver and a 0.75" silk-dome tweeter, but offers a wider frequency response range of 35Hz-25kHz due to superior driver and tweeter construction (the TC620i uses a polymer-composite cone driver and a silk-dome, rather than silk composite-dome tweeter).