Chapter 17

Large Room Acoustics

 

Sound System Engineering by Don and Carolyn Davis

 

WHAT IS A LARGE ROOM?

Manfred Schroeder has defined a large room frequency (FL) as the frequency above which a large number of room modes will be excited to vibrate at the source frequency.

(17.1)image

where,

FL is the large room frequency in Hz,

K is 2000 in the SI and 11,885 in the U.S.,

RT60 is the apparent reverberation time for 60 dB of decay in seconds,

V is the volume of the room in m3 or ft3.

If we assume for sound systems:

  1. A low frequency limit of 80 Hz for speech systems.
  2. A low frequency limit of 30 Hz for music systems.
  3. An RT60 of 1.6 s approximates the ...

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