Once installed and configured, your 18S should require little attention other than perhaps occasional volume control adjustment to suit different types of programme material.
Cleaning your subwoofer
Brush the cabinet surfaces with a clean lint-free cloth. Do not use a vacuum cleaner. If you wish to use a cleaning agent, apply it to the cleaning cloth and not directly to the subwoofer. Test a small area first, as some cleaning products may damage some of the surfaces.
Should you require help or advice there are a variety of support options for Dynaudio products. These can be found at dynaudio.com.