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Contact the manufacturer their customer service department is great
Sorry, there was a problem. Please try again later.Thank you for your questions. You should be covered under our warranty. If you send them in using our service portal just explain there is a problem with the left speaker volume. Most likely it will be covered. You can access a service request by fill out the link under our service tab. http://en-us.sennheiser.com/service-support/
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