
OLAH Stefan. Maybe, could you ask in your nearest Pioneer DJ dealer or go to ask the seller with your HDJ C70 and your purchase invoice.
Here you are some links to consider:
http://www.pioneerdj.com/en/product/headphones/hdj-c70/black/support
Or How to find your nearest technical support /Seller/Dealer to ask:
http://www.pioneerdj.com/en/shops
Take Care
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