I recently purchased a set of Audio-Technica ATH-Pro700 headphones to use with my VTL IT-85 intergrated amp. However, when I plug them in and listen I get a fairly significant hum(low end). They work perfect when plugged into my Marantz CD player. Any suggestions on how, if possible, to solve this problem would greatly be appreciated. The ATH-Pro700's have an impedance of 36 ohms. The VTL literature list the headphone out impedance as 16 ohms. Is this the issue? I could not find an out impedance for the Marantz CD player in their manual to check.
Thanks for the help!