Always require ISO 23351-1 DS,A from a named, independently accredited laboratory from any pod supplier. DS,A figures quoted without this basis are not equivalent — they may use different measurement methods, self-tested conditions, or component-level rather than enclosure-level testing. HIGHKA’s DS,A = 29.4 dB is independently verified by SGS under ISO 23351-1, representing full-enclosure system performance. When writing a competitive brief, specify “DS,A [minimum figure] dB under ISO 23351-1, independently tested by an accredited laboratory” as a mandatory compliance requirement.