YINYOO KBEAR OS1PRO in Ear Monitor Earbuds for Musicians, HiFi Headset Earphones Headphones Wired, Graphene Dynamic Bass Boosted, Noise Canceling, Auriculares Detachable Cable (with mic, Black)

The Opera Factory OS1 PRO should not be confused with its prior iteration the OS1. By all accounts, that earphone (the OS1) was somewhat dark and bloomy. However; the OS1 Pro couldn’t have been retuned any better. This is somewhat of an extreme V-shaped sound signature, but seems to be tuned with inoffensiveness in mind. Instead of being harsh in the treble, and bloomy in the bass, the OS1 Pro is very precisely rolled at both ends.What you are left with is a relatively fast, punchy, thumpy, bouncy bass derived mostly from the mid and upper bass regions with just enough subbass presence for warmth and character. In other words, subbass presence on most music is somewhat less present; which results in increase definition in the bass region, and less bleed or bloom to come out of it. I think Opera Factory was smart here to choose graphene as its driver material here to delivery this type of fast, sound, and separate this IEM from other ones in the market place at, or around, this price.Upper mids are well articulated, and vocal tonality and clarity was surprising clear, clean, and natural sounding at this price. Lower mid-range instrumentation and male vocals were substantially more in the mix compared to female vocals, but lucidity and articulation remained well done. Even when some components of the mid-range are presented more in the background on occasion, they still come across as transparent and articulate.The same goes for the treble response. The treble is rolled off at the top-end, but done so in a pleasing way; remaining apparent, and with some sparkle, even when some recession is evident. So, the treble never comes across as harsh, strident, or with over accentuation. This makes this set great for modern music genres like pop, rap, hip-hop, and others; which might be a bit boosted or lively up top for certain sets.Overall tonality is relatively neutral with slight warmth from its low-end emphasis and rolled tones. For an IEM targeted towards bassheads, this was a welcomed surprise- as were its graphene driver’s speedy nature and resolving character. It seems to be appropriately priced at $25. I compared the OS1 PRO to other similarly priced IEMS such as the Blon BL-01, Blon BL-03, and the Moondrop S.S.R. Clarity and resolution capabilities were more similar to the S.S.R., and therefore, superior to the Blons. Yet low-end prominence was most akin to the BL-01; but much quicker and more tightly controlled in the mid-bass. While mids were somewhat less emphasized than in the case of either the Blons or the Moondrop, mid-clarity was comparable, and treble detailing was more present and sophisticated in the OS1 PRO. But none of the treble presentations here (including the OS1 PRO) should be described as “in-your-face.”The build of this IEM is lightweight, but comfortable. The shell is made out of plastic, but it is aesthetically somewhat flashy without being gaudy, or going overboard. The cable uses nice connectors, has a nice y-split, and the microphone functions well. And while the ear hooks are somewhat on the aggressive side, I still found its cable easy to use. These also come with a very nice set of ear tips, and a cool unboxing experience. My only criticism of the build here is that it is a bit too light in weight, and I wish the cable material utilized was a little more rugged.But, in summary, the OS1 PRO is somewhat of an extreme V, but the presentation is pleasing overall. It is rolled off skillfully at both ends without too much obfuscation or sonic loss at either end. In fact, the OS1 PRO’s clarity and resolution were a surprise at this price point, and Opera Factory appears to have focused on what counts here: the sound. Nevertheless, this is more of a fun sound signature than an accurate one, but it is a presentation whose speed, sparkle, and pleasing character I enjoy.

Favorite earphones/IEMS I have tried. They have an amazing live sound to them, they stay in your ears even during intense exercise, and are very durable. Highly recommend.

Very comfortable though the wire around my ear doesn't adjust to have it stay on my ear but they fit so we'll in my actual ear that I don't worry about it falling out. There are moments when it's really soft but as I twist the cord around it then gets the proper connection.

Opera Factory OS1 Pro ReviewIntroduction:Let's start off with the unboxing experience. The unboxing experience here is honestly perfect. For a $26 IEM, I expected a lot less. But the unboxing experience here really blew me away. The OS1 Pro comes in a "graffiti-like" box. Once opened, you will be presented with the IEM itself, alongside its included tips (S, M, L) and its cable. The box design and the unboxing experience is really well thought out. Mad props to Opera Factory for putting effort into designing the box.Next, let's talk about the sound. The overall sound signature here is warm, dark, and bassy. The OS1 Pro is a bass focused IEM that sounds great with contemporary music. Music like Pop, Rap, Hip-Hop, Rnb, Electro, EDM, and Club music will sound great with the OS1 Pro. Bass is punchy and thick, Sub-bass is rumbly and well extended, mids are warm and forward, vocal presence is good and forward, and treble is smooth.The OS1 Pro isn't perfect, but for the price that it is selling for, it is very hard to nitpick. Here are the pros and cons of the OS1 Pro.Pros ✅:- GREAT well thought out unboxing experience- Great BASS. Warm, thick, and punchy bass- Great sub-bass presence and rumble- Good imaging for the price. Decent imaging in general- Good soundstage for the price- Soundstage is wide and tall- Good vocal presence.Cons ❌:- Noticeable mid bass bleed- Lack treble extension and sparkle- Instrument separation could be betterIn conclusion,At the price that the OS1 Pro is selling at, I would say that the OS1 Pro is a no brainer for bassheads and people looking for good bass at a budget. Its thick, quality, punchy bass, combined with its good imagine and soundstage, makes the OS1 Pro an easy recommendation for me. If you've been thinking of buying the OS1 Pro, just go for it. It is a no brainer in my opinion :)Oh and also, the OS1 Pro shell design is beautiful. Check out the pictures to see for yourself!