I'm considering whether it's worth upgrading my mp3 player as I'm finding that I'm using it more and more. I currently have a Sandisk Sansa Clip from 2009 and I'm wondering if I would get any better sound quality from an upgrade. One of the ones I'm considering is the Hifi Walker HD2. I tend to use Soundcore Q45 headphones. I've tried using the Sansa with my Sennheiser HD600 headphones. However, the sound is muted when using these. I'm not technically qualified enough to understand why this might be so. The question is: " Would the improvement in sound quality from an upgrade justify the cost of replacing an mp3 player which still works ok?" I look forward to reading your comments. Thank you.