Consumer Audio HD 660 S - HiRes Audiophile Open Back Headphone

The product is working fine no complains as such. However, the package was a bit old, it looked like it was returned and was opened. While it stated that it’s brand new. Otherwise I would give 5 starts

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If you are looking for noise cancellation then this is not the headphone you'll want to buy However if sound is your preference then this is the right product I started with Bose QC 35 then Audio Technica and now finally the Sennheiser HD660S. With just 150 Ohms it can be easily driven by a smart phone however I'll recommend a DAC for optimum output. My suggestion Fiio BTR5 as this also has a 2.5mm balanced output. The HD 660s also come with a pentaconn cable. I'll end by saying this is the best headphone for home listening and for travelling I'll suggest Audio technica ATHMx50 On sound Quality of the HD 660s good low's the BASS is decent not too overpowering and the Mid 's being excellent in its class, the vocals are awesome, on the high's it's good. The sound-stage is wide with fantastic imaging. The only CON that I see is the length of the cables it comes with are very long. Would have been better if there was a 3-4 ft cable as well.

First, let me start out by saying I'm a professional audio engineer with a focus on Jazz, Classical, Pop, and Americana genres. I own/use the following headphones currently: AKG K701, Audeze Sine, Audio Technica ATH-M50x, Beyerdynamic DT 1350-80, Beyerdynamic DT 880 Pro (250 Ohm), SONY MDR-V6, and a few more lower-end consumer grade headphones. Second, let me share something important in the HD 660S owner manual that some might miss: "These open dynamic headphones have been designed for home use with high-quality audio systems". Such system components display the "Hi-Res Audio Certificate" on their packaging and are thus meant to reproduce high quality audio recordings made to the "Hi-Res" standard. Numerous blind studies confirm trained listeners agree that what makes a headphone sound "good" is neutral, natural, balanced sound that replicates the audio quality of good speakers playing well recorded music in a good home acoustic environment. The HD 660S has been so designed; but if you want to hear how great the HD 660S sounds, you need to play music that already sounds great. So for those having no particular interest in superior high fidelity audio reproduction, then money spent on the HD 660S will be wasted. The HD 660S while somewhat forgiving, will make very obvious every flaw in music that has not been well recorded; and the lower quality of lossy audio formats such as MP3 will not allow the HD 660S to shine. The Audio Technica ATH-M50x, the SONY MDR-V6 or MDR-7506, or other cans of comparable quality, will get you a much better bang for your buck. For the rest, in my estimation, the HD 660S design goal has been well achieved, such that my HD 660S reproduces closely the dynamics, fidelity, sound stage and imaging of my studio reference speaker system. The HD 660S is a very musical headphone and worth considering for its intended purpose: enjoying Hi-Res music to the point one can get completely immersed in the experience. I would not use the HD 660S for tracking, mixing, or mastering. However, it *is* my go-to headphone for enjoying the results while relaxing in my easy chair at home. One more comment in that regard: Some reviewers are disappointed with the "width of the sound stage", accustomed as they are to the exaggerated sound stage width of most open-ended headphones. The HD 660S replicates the sound stage of my stereo masters *as they sound over my studio reference speaker system*. Sennheiser has in fact achieved with the HD 660S *not* the unnaturally wide stereo spread of most open headphones, but instead the "neutral, natural, balanced sound of good speakers in a good room". That, IMO, is a great accomplishment, and one of the main reasons I'm a big fan of the HD 660S. Writing this review in the Fall of 2022, I've not experienced any of the very few negatives some have mentioned in prior reviews of the HD 660S, and would purchase this headphone again in a New York minute. BTW, ignore the audiofools: there's no such thing as headphone "burn-in". Enjoy these right out of the box by giving your psycho-acoustic system (i.e. your ear/brain interaction) the opportunity to adjust as soon as possible to the audio signature of these very fine headphones.

Adquirí estos audifonos en Amazon Mexico a un super precio, solo aspiraba a los HD600 pero pues tuve oportunidad de los 660, son super comodos, enormes, de espalda abierta osea que no tiene tapitas a los lados, y se escuchan super bien, te la puedes pasar horas escuchando musica, sin ninguna molestia ni cansancio, es sonido plano podria decir que nada comercial, pero escuchas todo o casi todo, todas los sonidos ahi estan (a la altura de tus oidos, abajo a la derecha, a un lado, atras etc), me parece que su escenario de sonido no es muy amplio siempre sabes que estas escuchando con audifonos, sin embargo todos los sonidos estan separados, una gran desventaja es que ahora he detectado fallas en algunas canciones como sibilansias (cuando ponen mucho enfasis en la S), o esos microfonazos (sonido PA! PA!), son de 150 ohms no muy demandantes pero mucho mas que los comunes, los he conectado para probar brevemente en mi telefono xperia xz1 y se oyen con bastante volumen no estoy seguro si pierden detalle, los he conectado directo a mi laptop y se oyen bastante fuerte, pero prefiero conectarlo directamente a mi receptor de audio que tiene 330 ohms de salida para no errarle, incluye 2 cables uno balanceado y el normal como de 3 metros de largo, y su adaptador para la entrada comun 3.5 cm, todavia no tengo una salida balanceada para probar, sin duda una excelente compra, por cierto incluye una caja negra de carton para almacenamiento, bastante robusta.

Where do I start. First of all let’s mention that I’ve tried a lot of headphone in my life with many different style and brand, I’ve tried the Beyerdynamic dt770 pro, Sony wh1000xm4, Focal elegia, bose hp 700 and much more. All of these headphone are good pair of headphone but they where all made for different need. I do agree that the HD 660s is the best headphone that I’ve ever tried in my life. Fist let’s talk about Comfort, the HD 660s is very confortable but you won’t forget him, the clamping force is pretty high and will squeeze you head if you have a big head but after a few days it will get better, except this, these are very confortable headphone. Seconde things that i want to point out is the noice canceling, truly awesome, just kidding this is an open back design that men you can hear the outside and the outside can hear you. So keep in mind that for a good experience you will need to be in a calm room. Last but not least, I will say of course the most important thing in a pair of headphone is the sound quality. First if you like beats headphone or headphone with muddy and heavy bass save your money. The bass on this headphone is really good but you won’t feel it in your head, the bass is just sooooooo well defined and clear, I agree it’s lacking a bit in the sub bass area but that is just depending on what music you are lessening. I do want to mention that even if these headphone are only a 150 ohm with a sensitivity do a 104 dB don’t try it with your phone it will sound like a cheap pair of headphone. I don’t have a dedicated amps but they work pretty well with my gaming laptop who support Hi-Res audio but I agree that is not the best experience you can get out of this pair of headphone I will buy and amps soon to make sure I will have best experience possible. Anyway let’s continue in the sound quality by talking about the mids, damn they are good they just sound natural you feel like the person is talking right beside you, this is where these headphone shine the mids a just so well reproduced. Finally the treble, there is not much to say I’d you look at the frequency response graph they are not particularly present but are not sibilant at all they are very good, a good definition just what you like. I highly recommend this pair of headphone you can go wrong with this especially if they are in sale