Maybe you just don't like their sound signature (it's darker than the Sundara) Always check if you connected the jack properly I had times when something little was blocking it.

You can check your audio options maybe it has enhanced sound on or the quality set to CD or lower. Also it depends what on your music service lower quality means more compression that could make sound muddy.

When I had them I didn't have problems like you also your ears need time to get used to new headphones. Maybe you are looking for something v shaped around the same price you can buy a AKG K361 or 371 which has more bass and top end.