Although it will highly benefit from a headphone amp when used with any portable audio player, the Sennheiser HD25-1-II should still deliver usable volume levels with most iPod, iPad, MP3 players and computers even without a dedicated head-amp -- although chances are it may sound a bit 'flat' and un-dynamic when used directly from some portable sources. The HD25-1-II is well-recommended mobile choice for those willing to invest a bit into pleasurable high-quality listening with a portable head-amp providing maximized detail resolution and great musical punch.
The most unique feature of the long-running Sennheiser HD25-1 model is the headband that surrounds the head almost like a hat brim. An effective and comfortably ergonomic headphone, you can easily wear the HD25-1 over a baseball hat or even our neat-o HeadRoom employee beanies with a propeller on top! The HD25-1-II's unique 'split-headband' comes from studio applications where a secure fit is critical; it's amongst the most stable headphones we've worn during serious head-banging or while pulling sick disco-fever B-Boy dance moves around the office. The mid-sized 'supra-aural' (on-ear) earcups also swivel out of the way on the left ear so you can hear ambient sounds or perform fast-paced 'mono' DJ mixing with one ear. The band construction is a sturdy plastic composite material that feels well-built and durable. The earcups are padded with a supple leather-type material and offer respectable ambient noise attenuation.
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