SennheiserIE 600 in-Ear Audiophile Headphones - TrueResponse Transducers for exquisitely Neutral Sound, Detachable Cable with Flexible Ear Hooks, Includes Balanced Cable, 2-Year Warranty

I know the price is not exactly "low," but for an audiophile level and a premium pair of IEMs, the price is actually low. The sound is simply incredible. You will be able to hear every little detail in your music, even the parts of the music that are extremely busy, and that's my first and foremost requirement in an audio device before I can say it's great. Headphones and headsets like the Sony WH-1000XM4 and Samsung Buds2 Pro, they will muffle the sound in the background when there are multiple instruments being played at the same time, the IE 600 will let you hear everything.It delivers powerful bass while doesn't sacrifice the cleanness and sharpness of the treble, all while the vocals can still be easily understood. Most lower-level audio devices can give you two, but not all three.The only problem I have is with the cable, they are very stiff out of the box, they are difficult to shape to your ears, leading to loose connection between, especially in my case, the right earbud and the cable, the audio occasionally drops as I turned my head or even scratch my right face. The ear tips are not ideal either, it took me 6 to 7 swaps between different sizes and the silicone and foam tips before I finally find an ideal pair of ear tips that can sit comfortably in my ear canals and create a nice seal. The out of box experience is pretty terrible for a premium device like this one.

About the headphones themselves: they are some of the best you can buy. Sound quality is top-tier, comfort is probably the best I've tried. Incredible package and truly and endgame IEM. The eartips are mediocre and the cables are alright at best. It does come with a nice hardcase and 4.4mm balanced cable which is nice I guess but the overall cable quality is lacking. Highly recommend the Null Audio custom cables if you want to upgrade.Now to everything bad: These lasted about 2 weeks for me. At first I was convinced something was going wrong with the fit, the left IEM sounded like something was covering the opening. I could manipulate it and it would come back to life and then die out again. Tried different cables, ear tips, everything. I went to check online and this apparently is quite common! This truly floored me, I've owned probably 20+ IEM's and headphones, most made in China and cost less than half of what these did and I've yet to have ANY fail. This are made in Germany and are well above average in cost, arguably way too expensive in a world where Moondrop makes IEMs (see Blessing 2:Dusk, Variations).So I reached out to Sennheiser who quickly sent me an automated RMA packet with basically no instructions. I had to pay for shipping to get these sent out, but I didn't want to take the chance of returning only to get another bad set of IEMs. Reading online other people had just shipped back the bare headphones and had them quickly replaced. So I did the exact same, which cost me about $10 to ship to their QC department. Much to my excitement I received a package back from Sennheiser in about 5 days only to find they didn't even bother to open the package containing the IEM's and sent me a notice that I would have to send the ENTIRE original package back to complete this process.I quickly sent off an email to them explaining the situation, here I had PAID to return brand-new defective headphones which they rejected for repair based on not having the original box and presumably.....ear tips? Well it took about 5 days for them to respond and it was essentially an automated reply stating I would need to re-ship the headphones to them again with no further explanation.Screw that. Immediately shipped them back to the seller for a refund. World Wide Stereo was fantastic in paying for the return shipping and good instructions on how to do this. I'll consider buying these again in the future when I'm feeling brave but honestly what a garbage experience for a supposed 'high-end' product.In short, I would NOT buy these open box ever. My bet is they are defective returns. I will likely only consider getting them from authorized dealers with good return policies as well. If you get a good set you will be quite happy but good luck if you don't!

After all the hype about these headphones that I saw in YouTube reviews, I decided to give them a try since I consider music as a fundamental part of my life and my state of mind. I've been using them for a few weeks and I can say that they are my favorites. They have the perfect tuning to my taste, the music just sounds alive, it gives emotion and pleasure to listen through them. It's true that the treble can be a bit loud, but it never gets to the point of tiring or sibilance, I find it gives the music life and air. They are comfortable to wear for long hours and immerse yourself in your favorite songs.Cons: the ear tips that comes with the package do not work, they are really bad. They make these earphones sound flat and lifeless. I replaced them with some type e eartips and the difference is overwhelming. It bothers me that such an expensive product makes me spend extra money to make them sound like they should. Another point against it, I would like the cable to have a microphone and thus expand the range of use.In conclusion, I totally recommend them.*To the Sennheiser team, they must create new ear tips that really work.