I use a Naim Headline (£425) with mine but you need a power supply such as a NAPSC (£325), as a minimum, or a HiCap (£1900) as well. Have a look at TomTom Audio for 'pre-loved' bargins. The GS1000i headphones work beautifully with Naim, plenty of 'Pace, Rythm And Timing'. In my opinion you need first class source files (CD quality minimum) to make them shine.