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The federal lawsuits, filed in the US, target 'a number of internet based pirates and counterfeiters located throughout the United States'.
Popular models targeted by the counterfeiters include the CX200, CX300, CX380 II, CX500 and PMX80 earphones.
Based on violations of trademark infringement laws, Sennheiser is demanding 'substantial damages'.
The company claims to have identified more than 100 domestic pirates, which it plans to target in due course.
Sennheiser says it has taken the action after an increase in customer complaints and returns as a result of customers buying fake goods. A website based in China and a US eBay seller are said to be two key sources of the counterfeit headphones.
John Falcone, president/CEO of Sennheiser, said: "Customers are urged to purchase only from authorized Sennheiser dealers." There's a list of Sennheiser dealers on the company's website.
We suggest you read our exhaustive guide on how to avoid buying fake headphones before you make your next purchase.
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Joe is the Content Director for What Hi-Fi? and Future’s Product Testing, having previously been the Global Editor-in-Chief of What Hi-Fi?. He has worked on What Hi-Fi? across the print magazine and website for almost 20 years, writing news, reviews and features on everything from turntables to TVs, headphones to hi-fi separates. He has covered product launch events across the world, from Apple to Technics, Sony and Samsung; reported from CES, the Bristol Show, and Munich High End for many years; and written for sites such as the BBC, Stuff and The Guardian. In his spare time, he enjoys expanding his vinyl collection and cycling (not at the same time).
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