SennheiserConsumer 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

I got these instead of getting some ANC headphones, and boy was I happy with the purchase. First off, the packaging made me feel special. These Sennheisers come in a beautiful, stiff box with molded foam in the interior so you can use it again and again (and I did). There are multiple wonderful dongles and adapters for many different use cases, all with their own little place in the box. The headphones are relatively light, and the build quality feels, well, German. Attention to detail and material quality is through the roof.When I put them on, they clamped firmly-but-comfortably to my head, all the way around my ears. Since they're open-back, I can hear everything in my room, which makes it feel a lot more personal, almost more like a concert.I started listening to TOOL, and immediately had to lay down on my bed to absorb the experience. There's no way I can use these headphones casually, they're meant for a focused enjoyment of the songs you play. I went through my library, experimenting with different genres. I found that they reward you greatly for clear, high-end music such as TOOL, Pink Floyd, non-bass-heavy EDM, soundtracks, classical, jazz... the list goes on.What they aren't meant for is bass-heavy rock, hip-hop, edm, pop, etc. Since they're open-back, they really don't resonate well and the bass is quite weak.I found that I could play them fine off my iPhone with a converter dongle and the Dolby-Atmos high-res songs. I was thinking about getting a new DAC to try providing more power for bass, but at the moment, they work fine.Pros:-Sound quality and clarity that hits way above its price point-Great storage case-Multiple dongles and wires for different configurations and uses-Comfortable-Excellent build qualityCons:-Weak bass-Due to the weak bass, doesn't play some genres well, such as hiphop, EDM, etc (but I've found this to be song-specific. It doesn't like Parkway Drive's harder songs, but it loves 'Cemetery Bloom' since it's gentler)Would I buy again?-Yes, but if I want to experience all song genres, I may invest into a headphone DAC.

As far as I know, the post mid-2021 manufactured HD660S are made in Ireland (again), as printed on the box, which is accurate for importing purposes. However, Sennheiser Ireland continues to use the same modeling from post-2019 Romanian units, which the “made in Ireland” labels are replaced with CE labels…The design is similar to the other 600 lines but now with matte black and charcoal paint, the drivers still can be seen from outside. This is very cool. Build from solid, soft-touch plastic, with metal headband and metal cup grills. Very lightweight and comfortable due to having some deep and spacious earpads. Maybe not as premium feeling as those other ones which have more metal components. But those often weigh more than 300g and are more delicate, so there are some trade offs with different materials.Sound wise, these sounds great with an intimate soundstage. The sound is not technically “flat” but is detailed, natural, and fatigue free. It handles EDM, pop, classical music exceptionally well. In other words, the 660S is the most well-rounded, modernly tuned out of its family of 600, 650, 58X, etc.Compared to the 660S,600 is more harsh in the upper mids and drivers are slower in speed and sometimes struggles playing modern music if you listen critically.650/6XX is a bit chaotic in the lower-mid, kind of warm and less energetic/more laidback overall.58X has similar tuning to the 660S, but has less detailed and a bit less neutral.But if your music selection is better suited with those other headphones, you may not need a 660S and save $100-200 (which isn’t a lot considering this could last many years if not for more than a decade)But honestly speaking, one would be better off purchasing these and just settle with the thinking that those are the endgame for under $1000 range headphone. There is no point, after having the 660s, to then get other pairs from Beyerdynamic, focal, etc, if you are really just trying to enjoy your music collection and not creating a headphone collection. Those absolutely have served me well.

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.

Excellent sound and soundstage. I’m not usually a fan of headphones because of comfort, however, these can be worn for extended periods without discomfort. Fairly tight initially, they soon eased off and I find them a pleasure to use. Apparently need decent amplification or a pre-amp, work well with my Yamaha amp.

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 productI 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 ATHMx50On 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.