Metrum Aurix Headphone Amplifier
When Metrum were requested to develop a headphone amplifier, it had to be something special. Also the product had to be combined physically with their Octave DAC MKII. The result is the Aurix.
Not an ordinary design like many, but a real improvement on existing principles. Rather than using transistors or tubes for amplification a special step-up transformer is used. Said solution solves many problems as known in regular low gain amplifier designs and provides a very transparent sound image.
Only two FET transistors are in the signal path as an impedance converter (source follower, no amplification) and it is this property where a FET transistor can do an extremely good job and delivers a very high bandwidth having low noise and low distortion. The first Fet is used as an impedance converter to drive the step-up transformer. The second FET is used to drive the headphone. The circuits are running in full "Class A" so that a relatively large heatsink is required to flow the heat .
Besides the amplifier part we have used a lot of electronics just for creating the right conditions for the amplifier part and protecting your headphone against subsonics, offsets, pops and clicks. The result is a sound that is mainly determined by the connected source.
Shipping typically 3-5 days