Trouble with headphones

[Payo]

I cannot listen correctly to the headphones, the kicks do not sound properly, sometimes the vocals can't be heard, others the main chorus.
They are Stanton 3000, i bought them a month ago, the sound card i am using right know its not a quality one.

Thanks to everybody

[Darren]

I cannot listen correctly to the headphones, the kicks do not sound properly, sometimes the vocals can't be heard, others the main chorus.
They are Stanton 3000, i bought them a month ago, the sound card i am using right know its not a quality one.

Thanks to everybody

Sure it's an issue with the phones and not the card? Have you tested on different equipment?