• The measurements are made in a typical discotheque (14x25) with concrete floor.
• In the discotheque we have one disco-booth, one bar and one office.
• The height of the conventional speakers and the Jbn Sound Ceiling® are 3.0 metre above the floor.

• The conventional speakers are two cabinets with two 15-inch bass speakers in each cabinet.
• The sound levels are measured with Bruel & Kjaer 2218 in 100 point positions, 1.5 metres above the concrete floor.

• Sound Ceiling size: 3.0m x 3.6m and 5.4m x 4.2m.
• Better directivity in the 63Hz Octave is obtained with larger Sound Ceiling.