Old Lyme, Conn., March 10, 2014: Just in time for spring, audio specialist Sennheiser announced a new rebate promotion in which consumers get up to $100 cash back on select wireless systems and $50 cash back on select microphones and headphones purchased at an authorized Sennheiser dealer. Customers can learn more and take advantage of Old Lyme, Conn., March 10, 2014: Just in time for spring, audio specialist Sennheiser announced a new rebate promotion in which consumers get up to $100 cash back on select wireless systems and $50 cash back on select microphones and headphones purchased at an authorized Sennheiser dealer. Customers can learn more and take advantage of