If you're saying the S4 has no bass and you're sure the seal is good then it could be either fake or faulty (I hope it is the latter) Where did you buy it from anyway? I used to buy a cheap UE700 from a local seller and I swear it sounded a lot worse than SoundMAGIC PL50... Then I found out later that the seller is known to be selling fake IEMs. I finally had a chance to listen to a real UE700 and it was nothing like the one I had. Lesson learned. I'd suggest always buy from an authorized reseller so you won't regret it later.