I usually use over the ear ANC headphones like sony XM4's wanted to try an IEM without spending a whole lot. i got these, had trouble fitting them so i put them in a drawer, didn't seem worth the hassle. I mainly stream Tidal. For the XM4's ive moved to using a DAC (Ifi go blu) which sound great and recently upgraded to the Hip-DAC2.I dug these IKKO OS1s out and decided to give them a whirl with the hip dac. wow. these sound AMAZING. i'd put the sound stage ahead of the XM4 but are little more brassy sounding. but the comfort is TOP TIER. i can only handle the XM4 for a couple hours without getting fatigued. they're still a bit brassy on the high mid ranges. but pleasing over allnow the cons. only reason i didn't give it 5 stars is the fit is a bit goofy. extremely comfortable. but a bit weird. i used the memory foam ones, but the right earpiece doesn't fit my oddly shaped ear canal and it likes to slide out. if i really squish down the foam piece i can get it to stay but its always feeling like its about to slide out. i would appreciate tips that weren't so slick, and made of a soft deformable earplug type material.in general i would recommend. Note: i mainly listen to strange textural or electronic music like Kelpe or Thievery corporation, sometimes some jazz or classic rock. i have to have them a bit louder than say, klipsch T5 ANC or the XM4 in order to boost the mid-range.I rarely review things I have purchased. These BT connectors for IEMs are great! One can connect to them both at once or separately (Lside, R side) if one needs. The clarity using these in a working environment is excellent. I can hear the smallest sounds like people talking to their children in a very quiet tone, "take your juice box into the Kitchen...." while we are "ZOOMing". I can even hear my boss complain about the fact I can hear the others while we are in conference. :) I love these!First of all, I would like to talk about the packaging, it's mind blowing. Moreover it has many pairs of earbuds which makes us comfortable for listening. It comes with 1 Dual driver + Knowles 33518 unit and 1 Balanced armature hybrid driver. The hybrid drivers makes the frequency balanced and it's crispy and clean. The build in quality and the noise cancellation is too good. The MMCX cable solves the cable winding problem. For your listening pleasure I recommend you to invest in these IEM's.Let me make this simple for you...I started the return process for these headphones less than 45 minutes after opening the box. One of the earbuds mounted easily onto the wire, snapping into place. The second did not, and would not, no matter how hard I tried. You know your product is total garbage when it's defective even before you hear a single note. Stay away, far away. Out of the (currently) 5 reviews already posted for this, one person has also cited the very same problem I am speaking of. That makes 2/6 for 33% of all consumers. You have a 1 in 3 chance of this being defective right out of the box. Look elsewhere.I was amazed with this earphones where the quality is just awesome. I should say this earphones design is pretty good to attach or detach the cable and there are a lot of customized earplugs.Nice product but special for songs and not for gameThe cable didn’t fit the monitors and when I used a cable from another set of monitors that did. The guts came out of one of the monitors removing the cable. Totally crap product!Inizio dalla confezione assai curata e ricca di accessori , c'é persino un piccolo attrezzo per agevolare il distacco dell'IEM dal cavo.Gli auricolari in se sono bellissimi, quasi un oggetto futuristico. Le placche anteriore e posteriore sono nere in metallo. Interposto a sandwich tra di loro c'é un inserto in resina di colore purple con striature opalescenti dello stesso colore.L'ascolto di primo acchito mi ha lasciato un po' cosí, poi dopo qualche ora di burn-in tutto é migliorato sensibilmente. Il suono é molto pulito e lineare. I bassi, se la registrazione é buona, sono molto precisi ed ottimamente smorzati anche se non in primo piano, gli strumenti e le voci sono ok e cosí gli alti, piatti ed hi-hat sono presenti ma mai sibilanti. Una delle cose che mi ha colpito di piú sono i tom e la cassa della batteria. La cassa é presente sebbene asciutta e per i tom si riesce a percepire perfettamente la posizione sulla scena (tom destro o sinistro). Anche le percussioni sono chiare e ben localizzabili. I fiati sono cristallini. Quindi concludendo giudizio positivo, proseguo con il burn in. Brava IKKO.箱だしの印象は、ボーカルがとても綺麗。その後、丁寧な中低音が心地よく聴こえて来ました。中低音の音量バランスはニュートラルで、何かをブーストした様なバランスではない印象です。高音域に特徴があり、これを寒色系と表現するか、シャリつくと感じるかは人によって違いそうですが、私は程よいキラキラ感があって好きです。箱のイラストのイメージ通り、高音域が華やかで、それでいて刺さらないため、癒し系に感じます。低音系の刺激を求める人には向かないものの、キレの良さ、スピード感はあります。低音が弱いかのように評価される事がありますが、あくまで強調していないだけで、しっかりと質の良い低音を響かせます。きちんと低音の振動も感じます。広めの音場と解像度をちゃんと確保しつつ、音の定位が離れ過ぎないように、分離感はあえて抑えている印象です。分離感を抑える事で、音に一体感が生まれ、ノリよく聴ける印象です。このため、音場が狭いと感じる人もいるようですが、音の広がりは良い方です。私が持っているイヤホンで近いモノは、moondropのariaです。ariaよりは低音の量は控えめですが、低音の質感はこちらの方が良さそうです。高音は、柔らかめのariaと比べるとoh1sは少し硬くなります。その分、高音の解像感やクリア感はこちらが上手です。総じて、価格なりの良さは感じます。コスパと低音の量が欲しい人はariaな気がしますが、個人的にはoh1sの方が全体的な質感が高く、どちらか1つだけ選ぶならoh1sを残すと思います。moondropと比較しましたが、moondropが好きな人にこそ試して欲しいと思いました。