Thank you for your enquiry with Sennheiser.
The Amperior's have recently been made "End of Line", but I would expect stock to be available in the marketplace for the next 6 months, certainly until the end of the year.
Currently there is no direct replacement of the Amperior's.
ref no: #CON00012601.
Please use the following tag in the first line of your response to update this ticket