8m 'Acousmatic' Sound Dome Specifications
Dome 1: an acoustically treated (near anechoic) 8m diameter, 5m-high dome (49sqM) fitted with 30 loudspeakers, designed specifically as an instrument for ‘composing with 3-dimensional space. The main speakers are configured in 2 rings of 8x Genelec 8050s at floor level, and at 1.85 metres, with an upper array of 6x 8050s, a single 7070 subwoofer, and an inner array of 7 8030s (not pictured). The radius between the central listening point and the peripheral speaker array is 3 metres. The 8m dome is suitable for acousmatic work, interactive installation and visual music and has a capacity audience of 9 people. The installations and fixed media acousmatic works would normally run on a 10-30min repeat cycle. The 8m dome takes 4 days to erect and 1 day to set up and test the equipment with a team of 3 technicians.
The unique acoustic properties of the 8m dome also allows unprecedented accuracy in phase addition and cancellation, which is necessary for the manipulation of 3-dimensional sound images and the spatiaisation of up to 3rd-order (30-channel) ambisonic files – that is to say the shape of the dome causes identical reflections irrespective of the azimuth of the sound source. As such true ambisonic sound projection can only be achieved in dome or sphere-shaped spaces. In acoustic engineering circles this is a well-known fact. Near-anechoic acoustic conditions are also required, an as such the 8-metre dome is fitted with 60 cubic metres of Autex sound insulation.