QUOTE(kskoay @ Dec 21 2015, 09:22 AM)
thank you

, by the way, do you change the cable? I saw some ppl stated in Internet that this will improve the sound quality, but they didn't mention which cable that they changed.
Highly controversial.
As far as I know, for such short distances the physics and maths says it doesn't matter even if you use a super conductor. It does change, but you wouldn't be able to hear them anyway because the changes are in the hundred thousand Hertz range.
I have noticed a change from changing to a shorter cable (1.2m vs 2.0m), but since I don't have an original to compare it with, and I have had only a short time with it after spending over a year away from it, I'm not properly equipped to say definitely that it does change the sound. Besides, I have modded the drivers before changing the cables (Grado SR60i, easy to open up). The main reason I changed it was so that it could be more practical, and the stock ones have crumpled sleeves so they don't look good.
Some more intricately weaved cables with different metal conductors (silver cladded copper for example) can have different capacitance and inductance which acts like contours and filters to the headphone drivers, which would change the sound. But, the cost of an audiophile grade capacitor and inductor with comparable values do cost much less than an over-engineered headphone cable, and can easily be integrated. No one does that though.
What matters is the connector quality. A robust jack with a proper strain relief helps with reliability and longevity.
This post has been edited by VagueConcerns: Dec 21 2015, 10:08 AM