A shared public contact address

Send a clear
numerical example.

For a correction, describe the entered dimensions, unit, sound speed and maximum order, followed by the result you expected.

What helps an investigation

Include the browser name, the axis and mode label, and whether the issue appeared after changing units. A short text example is usually enough; no room address, photograph, recording or microphone measurement is required. We cannot promise an individual response time or provide a professional acoustic assessment.

Before sending

Email content passes through email and forwarding providers. Please avoid passwords, account access details, banking information and unnecessary personal data. If you saved an export, remove anything you do not want included. Read Privacy for hosting and local-calculation details.

The worked model guide may answer questions about exact ties, rounded displays and the omitted mode families.