DS,A is the A-weighted speech level reduction metric produced by ISO 23351-1 testing — the international standard for enclosed office furniture acoustic measurement. It directly quantifies how much an enclosure reduces speech-frequency sound levels. When evaluating acoustic pods, DS,A from a named independently accredited laboratory is the only verifiable performance claim. HIGHKA’s DS,A = 29.4 dB is independently verified by SGS. Marketing descriptions without an ISO 23351-1 figure cannot be compared or relied upon.