Preface: I've been using in ear headphones, mostly from established companies like Sony, Philips, Creative and whatnot for about 15 years, long before the term IEM was used. Never had any sealing issues. Recently the final pair of my trusty Philips SHE8500 broke and I decided to try out some Chinese IEMs.
So I've ordered the 7Hz Zero:2, the Truthear Zero Red and Moondrop's Chu IIs. On all of them I seem to have sealing issues with every single one of the stock tips. It's the worst with the Chu II, which sound like some old radio from the 50s. lol Interestingly enough, when I slightly angled the Chu IIs upwards and pressed them really deep in (using the largest tip pair), the sound drastically changed, became much deeper and warmer with SIGNIFICANT bass increase. But the moment I stopped pressing them in, the sound returned being cheap and flat. So it's definitely the seal which I have an issue with. The only one I achieve slightly better sealing with its stock tips (only with the largest pair) is with the Zero Reds, probably thanks to the large nozzle. But even then it, subjectively speaking, only 80% at best, using the largest piece of its stock tips. Only when I use my old L-sized tips from my old Philips SHE8500 I achieve a decent seal compared to the stock tips, however they are rather short and I feel like this is still not the intended sound.
Am I the only one with these issues? As I said in the preface, I used many different in ear headphones in the last 15 years, and I never had such seal issues. I feel like this might be partially to the lack of truly L-sized tips that come with the Chinese ones. It's like the largest option is always about M-sized compared to the largest option of tips when it comes to non-Chinese IEMs.
Am I the only one with such issues? Should I just get some larger tips? Or is it also an issue with the shape of my ear canal? As I said, with the Chu IIs I had to aim them upwards in an angle and press them in to get a proper seal and sound.