What are two characteristics of room acoustics regarding Cisco TelePresence Systems that should be avoided? (Choose two.)

Low ambient SPL (a quiet room) is desirable for TelePresence because it reduces background noise captured by microphones.

High reverberation causes audio reflections off hard surfaces, creating echo and degrading speech intelligibility for far-end participants. Cisco TelePresence guidelines specify that rooms should have appropriate acoustic treatment to minimize reverberation time. Excessive reverberation is a primary acoustic defect that undermines TelePresence audio quality and is explicitly identified as a condition to avoid.

An ambient noise level below 36 dBA meets Cisco TelePresence acoustic requirements and is a positive characteristic for conference room design.

Ambient noise levels above 36 dBA introduce background noise that interferes with microphone pickup and audio clarity for all conference participants. Cisco TelePresence specifications define 36 dBA as the maximum acceptable ambient sound pressure level for conference rooms. Exceeding this threshold is a documented acoustic deficiency that degrades perceived audio quality and should be avoided in room design.

An NRC (Noise Reduction Coefficient) of .75 indicates strong sound absorption, which reduces reverberation - this is a beneficial acoustic property, not one to be avoided.