Headphone sealed for bass, open to midrange

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Audio headphones must be designed to be sealed for effective bass reproduction while remaining open enough in the midrange to ensure safety by allowing ambient sounds to be heard. A passive design approach is sought to enhance bass without compromising the ability to hear voices and warning signals. Headphones with drivers biased towards low frequencies and a relatively open structure are recommended. Sennheiser is noted for its long-standing expertise in this area, with continuous improvements in bass response. The discussion highlights the challenge of balancing sound isolation with environmental awareness in headphone design.
Loren Booda
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Audio headphones, especially portable ones, need to be sealed against the ear at low frequencies to reproduce bass. They also need to be "open" enough in the midrange to hear traffic and people for safety reasons.

Can you think of a passive design (as opposed to electronic feedback) which would allow the reinforcement of bass, yet allows voice and warning sounds to be readily audible?
 
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You need to select headphones designed with drivers that are biased toward the low end and relatively open in design. Sennheiser has been a leader in this technology for over 40 years.
 
I have a pair of Sennheisers, and over the years the bass of their products has been improving, but nowhere like sealed headphones. Yours may be the best answer to my problem, though.
 
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