No — they are measured using different standards and cannot be directly compared. ROOM’s 30 dB uses the NIC (Noise Isolation Class) scale based on ASTM E336, which measures general noise isolation without specific speech-frequency weighting. HIGHKA’s 29.4 dB uses ISO 23351-1 DS,A, which is A-weighted specifically for the human speech frequency spectrum and is independently verified by SGS. For regulated procurement or international specification compliance, ISO 23351-1 is the internationally standardised benchmark; NIC figures are not directly equivalent.