Reply to VCI/Traktor problem! Not enough power?

Hello TT!

I bought myself a VCI-100 (great product!) a month ago or so and have been practising the fine art of DJing for some time now, but when i play a track with a lot of bass & sound it (this is hard explaining in english) kind of looses power or something. The sound drops and the bass gets flattened out, like it cant drive the sound on the power it gets from the computer.

Would buying a poweradapter solve this problem? Or is the problem in the soundcard/computer or maybe in the VCI?

Looking forward to a solution, have a great weekend!
Best regards, Joel Liljekvist