Studio Acoustics and Room Treatment Flashcards
6 cards from real CEA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Studio Acoustics and Room Treatment flashcards as text
What is the primary purpose of bass traps in a recording studio?
Answer: To absorb low-frequency standing waves and reduce room resonances
Bass traps are thick, dense absorptive materials placed in room corners where low-frequency standing waves (modes) accumulate. They reduce excessive bass buildup that would otherwise cause uneven low-frequency response in the listening environment.
What acoustic phenomenon occurs when sound waves of a specific frequency create stationary patterns of constructive and destructive interference between parallel walls?
Answer: Standing waves (room modes)
Standing waves (room modes) are resonances created when sound wavelengths align with room dimensions such that reflected waves reinforce or cancel the direct wave. They cause certain bass frequencies to be unnaturally loud or quiet at specific listening positions.
Which type of acoustic panel is designed to scatter sound energy in multiple directions rather than absorbing it?
Answer: Diffuser (e.g., QRD diffuser)
Diffusers scatter incident sound energy in multiple directions using a mathematically patterned surface (such as a Quadratic Residue Diffuser), reducing flutter echo and late reflections without making the room overly dead or removing a sense of spaciousness.
What does 'RT60' measure in a room's acoustic response?
Answer: The time it takes for sound to decay by 60 dB after the source stops
RT60 (Reverberation Time 60) is the time, in seconds, required for a steady-state sound to decay 60 dB after the source ceases. Recording studios typically target RT60 values between 0.2–0.4 s; large concert halls may have RT60 values of 1.5–2.5 s.
What is 'flutter echo' in studio acoustics?
Answer: A rapid series of discrete echoes caused by reflections between two parallel, reflective surfaces
Flutter echo is a characteristic 'ping-pong' or metallic ringing sound created when sound reflects repeatedly between two parallel, hard, flat surfaces (such as bare studio walls) before decaying. It is treated by adding absorption or diffusion to at least one surface.
In room treatment, what is the role of 'mass-loaded vinyl' (MLV)?
Answer: To add mass to walls and reduce sound transmission between spaces (soundproofing)
Mass-loaded vinyl is a dense, limp barrier material added to walls, floors, or ceilings to increase their mass and reduce the transmission of sound between spaces. It is a soundproofing (isolation) material, not an acoustic treatment for room response.