With the great variety of headphone choices, it is only possible to achieve the best performance with a single headset in mind.  You can not use the universal headphone amp concept with the Select level of performance.  That is why we have built a dedicated Stax* headphone amp to be paired the the Select DAC.

The Select Headphone Amplifier has been designed to take advantage of the powerful DAC outputs.  This allows it to achieve a level of headphone playback never heard.

If you are sharing the headphones with a two-channel system, use an internal bypass in the amp.  Simply turn off the unit for the signal to be sent to your other system.