Hi, I have a Vox Valvetronix 15 Watts I tried 3 headphones on it: 1- Grado Sr-80 : Sounded brilliant, but i returned them for the love and care of my ear health (it was a real pain on the ears after 10 minutes) 2- Denon 1001 : Terrible compared to the grado's , but i love them for music...