Gain selection for different impedence headphone
filter for sound strengthen
processor function for centeral positioning of the music

Expensive
silghtly difficult for carying

It's the best headphone amp of my hi-end amps. especially processor feature is really great sound as like hi-fi system, even better.

sound density is tight, stage is getting larger.

strongly recommend to use with HD650 headphone.

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OB-21SE
X-CANS, V3

Clean, neutral, sound Cross feed / delayed timing processor Tailor music to your listening preferences Flexible & Upgradeable World's BEST headphone amplifier!

Expensive Rather large and heavy

The HeadRoom Cosmic with the Reference Module option is simply the best portable headphone amplifier in the world! It features HeadRoom Corporation's proprietary cross-feed / time delay circuit version 3.0 which makes music sound natural and less fatiguing to your brain. It also has HeadRoom's Premium Electronics Board, recessed Cardas jacks, and a black, annodized, extruded aluminum case. There are three switches in the front: filter, processor, and gain. These allow you to slightly adulterate its pristine sound reproduction capabilities to suit your personal listening preferences. It is solidly built and it SINGS! You can choose to upgrade the unit by purchasing the Base Station One to experience a higher level of Audio Nirvana.

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