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Maximising the acoustics of your meeting room
Glyn Chapman
Acoustic Arrangements
Room Acoustics
• Reverberation
• Intelligibility
• Feedback
• Sound System Equalisation
Reflections
Shapes of room
• Worst possible room shape is a cube.
• The next worst is a room where all dimensions are multiples of the height. A pretty horrible example is a room 6m high, 12m wide, and 18m long.
• A good shape would be, say,
6m high, 10m wide and 14m long
Building Construction
• Sound Absorption Coefficient
Example: Painted Brick 0.02 @ 1khzDrape (18oz) 0.48 @ 1khzPleated Drape 0.75 @ 1khz
Full absorption = 1.0 Full reflection = 0.0
Acoustic Treatments
• If it soaks up water, it soaks up sound!
• Carpets, Drapes, Soft Furnishings
• Acoustic Panels
• You can’t fix it in the mix!
Graphic Equalizers
• Removes rooms resonant frequencies
• Increases headroom
• Improves tonality
• Increases intelligibility
How to set your graphic eq• Pink Noise and RTA• Auto EQ products – dbx Driverack• Ringing Out
Sensitive flat response microphone.Flat EQ on mic channel and graphic.Set gain level just below feedback.Increase each band until feedback and reduce by inverse amount.
orIncrease gain until feedback and reduce offending frequency.
Mid Sweep EQ
Loudspeakers
• Placement
• Dispersion
• Point Source ‘v’ Distributed
Other Tools
• Notch Filters
• Feedback Suppressors
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