Purchasing for your school? We love school POs! PO fax: 303-482-1142 / PO Email: [email protected] In order for students to do their best work, we know it is important to offer them external noise reduction in their school headphones. Encore Data Products has done the research for you by offering a wide selection of high quality classroom headphones, headsets and earbuds from Avid Education designed for students from pre-K through high school.