Urgent help regarding headphone

[JackOfHearts]

Is it bad to have this frequency response ?

No, even with ultrasonic it's ok (20hz to 20khz minimum for ultrasonic). Most earphone/earbud will play fine. It's only the speaker that are hard to find because they usually cost a lot more. I have bought earphone for 15 bucks and they can play ultrasonic.

Maniac u meant to say since it is 5hz it covers 20hz minimum freq. response ? or what I am not clear man

Yes the lower end (20hz) gets better if they are lower 17hz, 15hz, 5hz. It's like saying with "dates" that the requirement is to be born before 1900 and to die at least after 1950, so of you are born before it's better. The other end is represented by 20khz, for this one the bigger the better.

Thank you for your helpful response. I want to know more if I buy noise cancelling in ear headphone will it hamper ultrasound by any chance and I need to speak with others when I work but I can take liberty to keep my headphone in ear during work but I have to respond them to communicate. What do you think ?

Shannon said not to use noise cancelling headphone with sub.
The only thing that seems possible is find an earphone that doesn't obstruct the ear so you can hear the outside sound too.

I have bought this one and I'm not disappointed for now. It doesn't fall easily while sleeping.
http://www.sony.co.in/product/mdr-as200

My advice would be to buy cheap earphone from ~18$ to 30$ till will find one that fit your needs. I don't trust 100$ earphone, it doesn't seem to be a reasonable deal performance wise. Avoid Philips brand.