A couple living near the Alton Towers theme park in Staffordshire have told the High Court it is still too noisy.
Alton Towers says its noise levels are "rational"
Owner Tussauds Theme Park Ltd was ordered to cut noise levels in 2005 after complaints about noise nuisance.
The crown court later raised these levels, but Stephen and Suzanne Roper have taken the park to court again, saying levels are still too high.
The park's lawyer said the 40 decibel level was "rational" and residents should not expect "tranquillity".
Concerts and fireworks
Jonathan Caplan QC told the court there had been amusements at the site for more than 100 years and residents should be prepared to put up with some "inconvenience".
He added that World Health Organisation guidelines said noise levels of between 50 and 55 decibels were acceptable "below which the effect of noise should be negligible".
The Ropers, from Farley, claim the current noise abatement order does not control noise levels from concerts and fireworks displays and there is no adequate system in place to monitor sound levels.
They have also complained about the shrieks from people enjoying the theme park's white-knuckle rides.
If they lose their case, Tussauds Theme Park Ltd may also appeal against the noise abatement order.
The hearing continues.