best headphones maximum range for the lowest buck

[raaaid]

well seems mony cant bring happyness:

i paid 77.50 euros for a 777 headphones

their frecuency range is 20-10000 hz

human perception goes from 20-20000, it reduces with age

yesterday on my birthday the 7-7 i bought a set of headphones for 7.90

their range is 20-20000hz just as human perception

now i can feel the force of this girl singing: i coundt with the expensive headphons before since its like a dumbed perception

http://www.youtube.com/watch?v=QGJuMBdaqIw

i had never percieved a voice like that, that energy

so would be posible cheap headphones with range 5-30000 hz?

edit:

i have to correct myself the 777 have a arnage of 20-20000

then why i feel that force with the cheap headset but dont with the expensive ones