Harsh trebles. Good sounding tight deep bass. I have a reasonably good budget portable setup: XtremePro amp-dac dongle, Nokia phone running bitperfect USB Audio Player Pro, TRN 18core silver coated cable. My system sounds perfect with PR2, they have good detail and bass for satisfying and comfortable listening. Good headphones 6xx, 58x HE4xx also sound good on this system. I have a $3000 stereo speaker system of high end clone components, linear power supplies and cables so when I say those other headphones sound good I mean even compared to my speaker system. However, PR3 sounds horrible because its treble is sibilant harsh. Yes bass is excellent, better in definition than older model PR2, but overall unlistenable without eq on treble. Iβve broken in PR3 over 150hours burn in. PR3 may possibly suit a laid back r2r dac but will not suit a typical budget delta sigma dac without treble eq adjustment. And avoid silver coated cables to reduce harshness. If u dont understand get PR2 instead