PROMOTERS of the July 5 Happy Valley concert have pledged to spend $2 million on a computerised 'sound design' to avoid blasting residents with six hours of noise. The Media Bank Entertainment Group will spend 10 per cent of its $20 million budget hiring acoustic engineers to devise the sound system. Managing director Anders Nelsson denied the six-hour handover show would generate too much noise. 'I feel it is very rude of you people to call it noise. It is not, it is music,' he said. Unlike the Hong Kong Stadium - which is under a noise abatement notice setting a maximum night-time limit of 70 decibels - no permit is required for the Happy Valley sports ground. However, noise must not exceed 10 decibels above 'background' levels. Mr Nelsson said the concert would stay within the international limits of 70-75 decibels three metres from the nearest residential wall. 'That is a long, long way from our stage or our speakers,' he said, adding that unlike the stadium, the Happy Valley grounds would not funnel noise up and outwards. The stage would be at the far end of the sports field, away from the Hong Kong Sanatorium and Hospital, with the speakers positioned inwards. Mr Nelsson said a complaints hotline, fax and Internet address would be set up during the concert for 'killjoys' - but urged residents to join in the festivities. 'There are killjoys. You could almost call them professional complainers. They have always something to whinge about,' he said. 'I hope sincerely we're not going to have that because this is an historic event.' Hong Kong's future 'first lady' and patron of Celebrate Hong Kong 1997, Betty Tung Chiu-hun-ping, is expected to attend the concert. Organisers have billed the show - which features Wet Wet Wet and Lisa Stansfield and is expected to draw 35,000 fans - a 'Woodstock-type festival' for families. Mr Nelsson said it was a crucial test for the territory's future as a music venue. 'Obviously we don't want this to be the first and last,' he said. The latest equipment from Australia would be used. The Association for the Celebration of the Reunification of Hong Kong with China hired the Urban Services Department site, while the Jockey Club agreed to lend part of the grandstand for fans.