Review on Sennheiser HD 660 S: Ultimate Hi-Res Open Back Headphone for Audiophiles by Bujang'e Lor Nganim ᠌

You definitely need an amplifier or, at worst, a good sound card with a headphone amplifier. For the sake of interest, I connected it to the built-in sound system - the sound became flat, and in order to get how acceptable the volume is, you need to turn it up almost all the way Its pros: Great sound, very detailed and rich. After the ACG headphones, at first there are not enough highs, but when you listen closely, you understand that they are just right and they are really very detailed. Fans of hypertrophied bass are not at all here, these are open headphones, there is as much bass as needed and it does not mask other ranges. The middle is generally great, the voices even have some volume Has cons: The disadvantages would be the pressure on the head when you put on the headphones for the first time - it is directly felt. Then you get used to it, the ear pads adapt a little and you can sit in the headphones for more than one hour, but in the first moments when you put it on .