Headphones are a varied bunch in terms of how much current they take to drive properly, and those little inbuilt headphone amps in CD players and assorted systems are a stop gap at best. If you have even a reasonable set of headphones, they'll sound much better through a proper headphone amplifier like the Rhinelander by Lehmann. It has the right character of a small but vary capable amplifier section, quality volume control, specially selected components, and enough resilience to cope with the varying demands of full-size upmarket headphones. The legendary Black Cube Linear by Lehmann audio is used by well known professionals like A.J. van den Hul, Andreas Spreer (TACET) and Maarten de Boer (The Masters). It can serve one or two sets of heaphones simultaneously and drive them to their full potential. Inside you'll find: Discrete Zero Global Feedback output stage with high quiescent current ready to drive most headphones or long cable runs; Audiophile voltage amplifier stage; Only MKP caps in the signal path for perfect transient response and ambience reproduction; Gain jumper selectable 6dB/20dB; Hand selected potentiometer with very good channel tracking; Double sided audio board; External AC power supply; Ultra fast rectifying diodes; We only use low ESR electrolytic caps; Low-noise, regulated power supply; Gold plated RCA connectors; Original Neutrik headphone jack with gold plated contacts; Anodized aluminium faceplate and knob available in silver or black.