SENNHEISER HD 660 S - HiRes Audiophile Open Back Headphone

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

This Sennheiser HD 660 S isnt as clear and revealing as I expected. Also not super tight and clear on the bass, it sounds a bit woolly. I compared the brand new HD 660 S directly to the brand new HD 650 and the 650 is even more veiled (i.e. lack of highs) with perhaps a bit more emphasis on bass than the 660 S. With my tube phone preamp I I dialed in 50% more bass (+ halfway) and 100% more treble (+ all the way), to get to the sound I was used to with my previous headphones (Panasonic RP-HD605N-T), and I wish I had more treble on tap. The HD 660 S comes with sturdy and 10 long cables (6.5mm and 4.4mm, with a 6.5m-3.5mm adapter). I find the original cables too long and wieldy to use in a desktop situation, and I bought a 6.6/2M Youkamoo 3.5mm Replacement Upgrade Cable from Amazon which has a perfect length, weight and flexibility for desktop listening. (I cant really make any objective statements about the Youkamoos sound quality, but when compared directly to the original Sennheiser cable it is at least as good.) Perhaps I need to break these Sennheiser HD 660 s headphones in over time? Im hoping that the sound quality will improve over time, as I am totally not blown away at the moment.

Great sound, good build quality, needs an amp to sound loud.

I received the Headphones in a damaged box, it looked as if they had been previously returned by another Customer.

escucho musica todo el dia y no me cansa ni me fastidan, el sonido es tan perfecto que puedes escuchar musica a un volumen muy bajo y aun disfrutar cada sonido. los recomiendo 100% es una excelente inversion para los que escuchamos musica todo el dia todos los dias y un sonido inigualable

Great quality headphones! The clarity and mids are solid. I connected mine to a SoundBlasterX G6 for gaming and honestly I’m blown away by these. I hear every little footstep and reload noise. Fantastic!

Great sound reproduction! Used for digital piano. Fabulous sound and soundstage. Comfortable.

Where do you even start with these, theyre as close to perfect as headphones can get. If you look at the frequency response you will see that these are mid-focused cans with no treble peaks and emphasized bass. The overall presentation of the sound is so beautifully balanced they still make my jaw drop every now and then. Since treble is so de-emphasized they will clean up even horribly recorded tracks and make songs that have been masterfully engineered sound even better. They dont have any modern features which people buy headphones for nowadays such as noise-cancelling and bluetooth connectivity so I cannot recommend them for any other purpose than listening, but if youre looking for headphones with no other utility besides presenting music in the most gorgeous way, this is what youre looking for.

These headphones produce the highest quality sound I’ve ever heard. I use them for both gaming & music. Amazing for both!

Great headset but requires an AMP to sound good, using GSX 1000 with this and the clarity is insane, however I am not sure if it is worth the 500$ (iam a normal gamer who casually listens to music), the GSX 1000 can make any regular headset sound almost as good.