Skip to main content
Article thumbnail
Location of Repository

Subjective Validity of Figures of Merit for\ud Room Aspect Ratio Design

By Matthew Wankling and Bruno Fazenda


Attempts have long been made to classify a room's low frequency audio reproduction capability with regards\ud to its aspect ratio. Common metrics used have relied on the homogeneous distribution of modal frequencies\ud and from these a number of 'optimal' aspect ratios have emerged. However, most of these metrics ignore the\ud source and receiver coupling to the mode shapes - only a few account for this in the derivation of a figure of\ud merit. The subjective validity of these attempts is tested and discussed. Examples are given of supposedly\ud good room ratios with bad performance and vice versa. Subjective assessment of various room scenarios is\ud undertaken and a ranking order has been obtained to correlate with a proposed figure of merit

Topics: T1, TA
Year: 2009
OAI identifier:

Suggested articles


  1. (2008). 8. APPENDIX 1 The following three plots show the variation of FOM across receiver position in two different sized rooms, and with differing damping conditions.
  2. (1981). A New Criterion for the Distribution of Normal Room
  3. (1971). Dimension-Ratios of Rectangular Rooms with Good Distribution
  4. (2006). Low-Frequency Optimization Using Multiple Subwoofers,”
  5. (2003). Modal equalization of loudspeaker-room responses at low frequencies,”
  6. (1946). Note on Normal Frequency Statistics for Rectangular Rooms,” doi
  7. (2005). Optimal Modal Spacing and Density for Critical Listening,”
  8. Optimum Dimension Ratios For Studios,
  9. (2005). Perception of Modal Distribution Metrics in Critical Listening Spaces-Dependence on Room Aspect Ratios,”
  10. (2004). Room Sizing and Optimization at Low Frequencies,”
  11. (1979). The Acoustic Design of Talks Studios And Listening Rooms,” doi
  12. (2001). The Master Handbook of Acoustics , doi
  13. (2007). Thresholds of detection for changes to the Q factor of low-frequency modes in listening environments,”

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.