SENNHEISER HD 660 S - HiRes Audiophile Open Back Headphone

Way too tight on the head, didn’t find the ear cups very comfortable either. To me, the sound is like a dark version of the recording with emphasis on mid bass, and just about the rest of the sound rolled off.

Sound amazing highly recommend

I love these, the earphone itself feels a bit stiff. The sound is great, and got them on sale so awesome value there.

The way these things get reviewed and talked about, youd think they were actually worth the large entry fee. I found them to have virtually zero high end. I realize they are not meant to have sparkly highs, but holy crap - it sounds like youre wearing them over a ski mask. Build quality is good, comfort is good, weight is good - I just couldnt EQ them enough to sound reasonable. Returned them immediately. And dont start with the they werent broken in crap. There was no recovering from that. So, bottom line, try before you buy.

The headphones have natural and pure sound, typical signature of Sennheiseir with strong bass, detailed mids and sweet highs. This should be used with a headphone amp. However At $500 there are several options to compare, these are Like New at $350, so, ...

These are Sennheiser and think should be renamed to Sense-Heighteners. I had a fee headphones of theirs but this is such an upgrade I heard everything again with a new light as if hearing these songs brand new again.

Wanted to loved them but the sound signature is not for me. Fairly airy and precise but no bass whatsoever! Fairly flat sounding - accurate? Perhaps. But the overall sound didnt speak to me. Very lean sounding with little meat on the bone. Perhaps a great vacuum tube headphone amp can help here but I am way pass that.

Incredibly high quality in every way. Comfortable with a clean, abundant sound that allows you to hear every nuance.

I loved this headphone. It sounds amazing and I highly recommend if you can tolerate wearing a headphone. I cant myself, I get a headache 10 minutes after wearing it because headphones push on my facial pressure points. That is partly why I returned, because it was just painful to wear. The clamp force is high but loosens up after a couple days. Overall I dont think Im going back to headphones anytime soon. Ill stick to IEMs. Recently got the moondrop blessing 2s and love them. Definitely different sound from these warmer boys though.

These are fantastic, perfect road to HD 800 or HD 820