I beg to differ. I purchased the HFI-780 last week and they have ample bass! I listen to Metal and a little Rap and the bass is plenty. What really impresses is the "thump" you get. It's just something I have never heard before. I have the Beyer DT1350 and it too has good bass but lacks the "thump" the HFI-780 gives you. I have around 25 hours burn in on the Ultrasone and love the sound signature thus far. Apparantly, you need to have on average 200 hours of burn in for things to settle. The HFI-780 sounds just like the DT1350, great bass, great mids, great treble, but what you get extra is the better soundstage and the "thump" impact in bass which makes is very enjoyable. I also read that Ultrasone are the closed Grado of the headphone world and I absolutely agree. I use to have the Grado 325i and the Ultrasone, and Beyer to some degree, sound very similar. It's really in your face, energetic, lively, and detailed. Unlike Sennheiser which I find to have a very dull, boring sound signature. I cannot comment on the Pioneer but wanted to give my feedback on the HFI-780. For me, it has plenty bass and for the price, think it's one of the best at it's price point.
