HD 660 S Open Headphones

These sennheiser headphones deliver some of the best audio quality i've ever heard. Bass is practically non-existant however so I use an equalizer for that. They're very comfortable.

I'm not an experienced reviewer, and still fairly inexperienced with this tier of headphones. But maybe my experience with these headphones as an average audio enthusiast might help some likeminded individuals decide if these are worth checking out or not. The setup and sources I use Primary Source/DAC/Amp: Fiio X5 mkiii Music sources: Spotify Premium, HiFi, Flac, 320 kbps Build quality No complaints here. Even though the exterior is mostly plastic, the frame of the headband is made from aluminum, and does not feel cheap or vulnerable at all. The plastic allows these headphones to be very light, which contributes greatly to the comfort. The HD 6-- series have been known to endure for decades when properly taken care of, and I have not found any reason to doubt that. Comfort This might be the most significant selling point for me. They are definitely not very comfortable right out of the box, since the clamping force is initially quite prominent. Also the pads are fairly stiff, which in combination with the clamping force, puts a fair bit of strain on the arms of my glasses. They still were more comfortable than many headphones I've owned before though. As time progressed, the headband loosened up, and the pads had worn in, forming to the shape of my head. Since then, they haven't been uncomfortable at all anymore, and I've been able to keep them on for endless hours without feeling strained. Like many others have said, you just forget that you're wearing headphones after a while. Power requirements They are rated at a nominal impedance of 150 ohms, and are advertised to not require a dedicated amp for good results. While I do agree that these sound absolutely fine with my iphone X and galaxy s9+, but i primarily use a Fiio X5 mkiii player and that has definitely shown a worthwhile improvement. Not only to achieve satisfactory levels of volume, but also to remain free from distortion at much higher volume levels than my on-board audio. It just sounds more effortless and linear overall. Sound Bass The bass on these is tight, quick and punchy. Without EQ, the amount of bass is leaning more towards being bass-light, which isn't optimal for bass-heavy genres like modern hip-hop and various electronic subgenres. There is still a decent amount of mid-upper bass, which is sufficient to nicely complement instrumental/vocal focused genres like rock, jazz, soul, classical etc. With EQ, the bass can be elevated quite a lot without sounding distorted or awfully off. Also, with tracks that have a lot of loud bass going on, the bass does start to audibly struggle quite a bit, and can at times sound a bit distorted. Overall, it's not capable of being a bass-cannon, but for my likings, it's capable enough. Midrange This is regarded to be the main reason why the 6-- series has been so popular for over 20 years, and rightfully so. Vocals sound impressively clear and forward, definitely the most realistic representation of vocals I have heard on any headphone. Even realistic to a degree where you can almost feel the breath of the singer. Intrumentals are also presented with magnificent detail and separation. Opposed to the HD 600 and 650, these don't sound veiled at all. Vocals are very much in-your-face, instrumentals right behind it, without feeling like anything overshadows anything. Very impressive! Treble I am quite treble-sensitive, which contributed greatly to why I like the 660 S more than the 600 or 650. To my ears, the treble is already leaning towards the brighter side, but the EQ conveniently smoothens it out just enough to hit the sweet spot for me. The slightly recessed treble does translate into a mild loss of fine details and sparkle in that area, but for my own listening enjoyment, this tradeoff is worth it for me. Soundstage The soundstage on the HD 660 S is decent, but not impressive. It's still wider than any closed back headphones I have tried, and there is enough width to get a proper sense of separation and distance. It sounds a bit wider than the 600/650 to my ears, but this might be because there appears to be a bit more air in between different sounds. On the 600/650, adjacent sounds can sound a bit more like they are transitioning into one another, while the 660 S sounds like there is much less of a transition, and more air in between sounds. Final verdict The HD 660 S does a lot of things exceptionally well, and has not revealed any major flaws. The combination of comfort, the beautifully balanced sound signature that never fatigues, the resolving capabilities, the flexibility to EQ this to a wide variety of different sound signatures all make this a headphone that is very difficult to criticize.

Dopo più di un mese d'uso, amo le cuffie di più. All'inizio, penso che non abbia molto il bass, infatti lo è, ma ci vuole un po' di tempo per abituare e per riconoscere che le cuffie sono molto bilanciate in tutte tre bass, mid e trebbe. Il bass è abbastanza per farlo sentire ma non supera il mid; il trebbe è chiaro e nitido. Senza dubbio, come le altre recensioni hanno confermato, HD660s sono assolutamente precise, fano sentire ogni cosa viene stato registrata in maniera perfetta, non confusa e bilanciata. La mia combinazione è Schiit Modi Multibit DAC, Schiit Vali 2 come amp. Ma la cosa che renderebbe tutto straordinaria è la valvola che si usa con il Vali 2. Tre esempi: quella stock (va insieme con il Vali) è una canadese 6BZ7 che da il suono naturale, abbastanza brillante, ma il bass è inferiore, non è chiaro. Tutto cambia con la Mullard E189CC (quella militare), il suono è stato molto migliorato, il bass è forte e chiaro, il mid è preciso, il trebbe è brillante come la fama di Mullard. L’ultimo esempio è quella di Philips, la E188CC SQ. Tutto è perfetto! Niente da dire. La qualità di questa valvola è incredibile. Il suono è vivace, chiaro, bilanciato. Il suono della chitarra diventa così precisa come si sede davanti il musicista. Il soundstage è molto ambio, rende la musica assolutamente musicale e piacevole sentire ma la musica non diventa superficiale ma reale. Con il tempo, le cuffie diventano comode fino a punto che non si rende conto più le sta mettendo.

C'est un casque HIFI, les lecteurs qui le comparent à du gaming se sont trompés d'usage et de produit. Sur du Haendel, les voix sont claires et définies, les concertos pour piano de Mozart limpides, souples ouverts en image stéréophonique. Evidement on n'est pas au niveau de Focal, mais c'est 1/3 du prix avec ce casque là pour un son très équilibré, ouvert, défini, rond. Un détail: c'est un casque "ouvert" donc pas adapté à l'extérieur, au train etc. C'est un usage HIFI à domicile.

ハイエンドクラスと言われるようなヘッドホンを買っては売りを繰り返していましたがその下にあたるミドルクラスのこのヘッドホンを未だに手放せずにいます。 理由としてはダイナミックドライバーのウォーム系であればコスパ最高だと思うからです。これを越えるとなるとFocalくらいじゃないでしょうか。とたんに桁が変わります。 残念ながら上位のHD800や700は手元に無いです、クリア系は平面駆動には勝てないと感じました。だからこそずっと手元に置いておけるこのHD660Sです。 ・音質 濃厚な中音域、豊かな倍音表現、暖かみのある音でとても心地よく聴けます。解像度が高いのにも関わらず角は取れていて優しく素晴らしいバランスだと思います。 ヘッドホンアンプが無い状態やパワーの無いシングルエンドですとややフラットで若干籠ったような音になり上流を選びます。 籠った音で残念というレビューを見かけることがあるHD660Sですがそう感じてしまっても仕方ないと思うことは多々あります。 透き通った音が好きな方にはあまりおすすめできないかもしれません。 ・音場 広いと言う感じてはなく優しく包み込まれるイメージです。 ・装着感 私は問題ありませんが側圧は強めだと思います。軽さはいいですね、全く疲れません。 ・付属品 高品質な3mの4.4mmのバランスケーブルが付いてきます。3mのバランスケーブルをリケーブルするとなるとかなり高価になりますので屋内でゆったりと聴きたい私にはかなりのプラスポイントです。 聴いているジャンルは流行りのPOPSや古いロックです、クラシックやジャズは滅多に聴きません。 音楽に集中したい時はそれこそ数十万クラスのヘッドホンを使っていますがリラックスしたい時はこれです。この病み付きになる中音域、手放せませんね。