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Polk Audio RC85i 2-Way In-Wall Speakers (Pair, White) by Polk Audio,

Sound Proofing for a Home Theater, using Resilient Channels and Rock Wool Insulation. Would have been better if double drywall layers were used or OSB boards as a backer layer. But this is more economical.

Polk Audio RC80i 2-Way In-Ceiling Speakers (Pair, White) by Polk Audio,

Polk Audio Dual 5.25" Two-Way Center Channel In-Wall Speaker - 255c-RT by Polk Audio,