| http://www.w3.org/ns/prov#value | - They provide lower levels of sound absorption and at a narrower band of lower frequencies.Active acousticsActive acoustic measures include public address systems, sound masking (white noise played through speakers to mask intrusive noise) and, most commonly in classrooms, soundfield systems.Soundfield systemsA soundfield, or voice-reinforcement, system is a technology first introduced in the US in
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