Hello! I recently purchased the Kraken: Tournament Edition. After purchasing, I noticed how muffled the audio sounded. Perplexed I went through forums, looking for an answer. Noticing these threads were mostly empty, and without answers. I wanted to share how I 'Fixed' my Kraken: Tournament Edition.
What's causing the Muffled Audio:
So what is it that is exactly causing the issue, its actually very simple. referring to the product page, scrolling down you will come across the listed functions of the included 3.5 > USB-A Audio Dongle. Listed under #2 you will find "Bass Control" its the knob to the left of the Razer Logo. Pushing it down or up will modify the amount of bass your headphones will be receiving. I found that mine, out of the box was either set to maximum, or near the highest amount of bass the dongle could output.

The Solution:
The included 3.5 > USB-A Audio dongle has a knob that allows you to adjust the bass. It can be located on the side, left of the Razer Logo. Moving the knob down will lower the bass being outputted to the Headphones. Hence lowering the overpowering muffled sound of lower frequencies.
Conclusion:
It's sad to see people frustrated with their new headphones not realizing the issue could be as simple as a bass setting. I hope if you or your friend was having this issue, this was the solution to the problem.
If this did or did not solve your issue, please participate in the pole below.