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The Computer Controlled Noise Control Demonstration Unit, "TDRC", has been designed by EDIBON to obtain visual and quantitative results related to noise and vibration control. The main parts of the unit are two noise sources consisting of a motor with a gearbox and a fan. The rotational speed of both sources can be computer controlled resulting in a variable noise. The two noise sources are mounted on a platform supported by four anti-vibration mounts (silentblocks) with a device for varying the flexibility of these mounts. The device consists of a crank attached to a screw threaded into the base unit. The crank allows the screw to be controlled in such a way that the head of the screw pushes the platform supported by the silentblocks. A rigid stainless steel enclosure is supplied in which an acoustic test lining can be fitted to check the noise reduction produced. Both vessels have holes to make it easier to place plugs of different materials (PVC and rock wool) and pipes supplied. At the base of the unit there is an adjustment mechanism to ensure the correct position of the rigid enclosure and to check how good sealing and adjustment can reduce noise. An eccentric rotor can