A location is quiet enough when the cat can use the tray without regular disturbance from people, animals or sudden noise. That does not necessarily mean the quietest room to human ears. A utility area may be calm between wash cycles but unpredictable when a machine starts. A living room corner may be peaceful in the morning and crowded every evening. Observe the location across a normal day, including visitors, cleaning and doors opening.
Consider whether another cat can watch or block the entrance. The cabinet itself does not remove those environmental pressures. Keep the space consistently accessible and avoid checking on the cat while it is toileting. If you notice hesitation, interrupted visits or avoidance, reassess the setting and discuss new toileting changes with your vet. A suitable position supports the cat's normal routine rather than requiring it to wait until the household becomes quiet.
Notice short disturbances as well as background sound: a cupboard slammed beside the cabinet or an appliance starting unexpectedly can matter more than a consistently quiet conversation elsewhere in the room. Choose a location with a predictable routine.
For product comparisons alongside this advice, see OakAlcove litter cabinet and Library House litter cabinet. The details below explain their sizes and uses.
Further reading: rspca.org.uk; battersea.org.uk.
OakAlcove litter cabinet
Library House litter cabinet
Ivory Gallery cabinet and tree