Polk In-Ceiling Packs Hidden Punch
Each of these three in-ceiling models has a concealed woofer mounted at a diagonal. It fires through apertures at the front, where there are also tweeter and midrange drivers. Prices range from $400-1000/pair with ascending woofer sizes from 6 to 8.6 inches. Two buttons tailor the speaker to the space. They include a notch filter and a circuit that adjusts for room reflections.