The ZEN CAN Signature 6XX improves the sound quality of the original ZEN CAN and adds something special – a custom EQ setting called ActivEQ. It combines active and passive components to create a specific EQ curve to suit the ‘MassDrop x Sennheiser HD 6XX’ headphones. This can be switched off to make the most of all manner of headphones and in-ear monitors. It also features XSpace – an analogue processing mode which compensates for the ‘in-head localisation’ effect that can occur when using headphones to listen to music that was mixed using a pair of speakers. It features four gain settings in six dB steps – 0dB, 6dB, 12dB and 18db. The ZEN CAN Signature 6XX’s circuitry is a balanced, symmetrical dual-mono design. It delivers 1600mW (7.2V) into 32 ohms from the single-ended output, with 15V+ available to loads of 300 ohms or more through the balanced output. It offers stereo RCA and 3.5mm single-ended inputs, plus a balanced 4.4mm Pentaconn input. A 4.4mm balanced output is also provided. It has a 6.3mm output for headphones that have a standard single-ended connector and a 4.4mm Pentaconn balanced output for headphones offering a balanced connection.