Is there anything else unusual that it features?

The ZEN CAN Signature HFM features a switchable ActivEQ equalizer specifically designed to get the most out of HIFIMAN headphones. One button press is all it takes to calibrate the amp’s signal to complement HIFIMAN’s frequency response characteristics, which results in its performance tailored to precisely fit these headphones like a made-to-measure suit. What’s more, ActivEQ does this without adding any of the distortion commonly associated with passive equalization circuits.

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