Audio specialist Sennheiser appointed two new sales representative firms in California, Hawaii, the Southeastern U.S. and Puerto Rico. Santa Ana, CA-based Quantum ST will now represent California and Hawaii, while Deerfield Beach, FLA-based RTSales is handling Florida, Alabama, Georgia, Mississippi, Tennessee and Puerto Rico. The announcement follows Sennheiser's June appointment of Dobbs Stanford for the U.S. TOLA region (Texas, Oklahoma, Louisiana and Arkansas).