Whether the noise/nuisance is excessive is hard to judge without being there but it sounds to me like you have a fair case. I would say that the committee was only authorised to install substantially in accordance with the information provided to the general meeting. Your reference to the standards is very likely to help your case. I don’t know of any helpful Tribunal cases.
If it does end up as a Tribunal matter, asking to start with a ‘view’ on site could be useful. Then you can demonstrate the noise and confirm the location indicated in the general meeting documentation. This could avoid getting bogged in arguing details or having the Tribunal member visualising things inaccurately from photos or diagrams.