Narain Professional Audio Pvt. Ltd offers Transformer Unit with 2 or 4 Separate Torodial Line. Narain Professional Audio Pvt. Ltd also offers various types of electronic goods. The Transformer Unit with 2 or 4 Separate Torodial Line, COS Series, is housed within a 19" rack mount chassis with Phoenix type connectors. The Transformer Unit with 2 or 4 Separate Torodial Line has separate line input for all channels. This Transformer Unit has a low cut filter which cuts off frequency below 80Hz.