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For a 20-seat meeting room with two wall speakers, is a 2x350W Class D Amplifier enough?
The room is used mostly for speech, not music.
Yes, a 2×350W Class D Amplifier is more than enough for a 20-seat meeting room used for speech.
Speech requires far less power than music, so two wall speakers driven at 350W per channel give you a comfortable amount of headroom. You will likely run the amplifier well below its maximum, which also means clean, distortion-free sound for the whole room.