Hi, This question might had been asked before but can someone recommend a good headphones that can be easily calibrated with a standard 6 cc coupler? (expect for TDH which are sold only in quantities) Thanks, -Yoav -- Yoav Arieh, Ph.D. Assistant Professor Montclair State University Department of Psychology 1 Normal Avenue Montclair, NJ 07043 (973) 655-7639