Hoping someone can help me out. So I've always wanted a pair of Etymotic ER4s to use as a throwaway pair due to the isolation (for mowing lawns, power tools, snoring etc), but i could never justify the price of them due to risk of damage or getting lost/stolen etc. Plus, I've tried a few Balanced armature earphones and found I disliked the shrill treble so I probably wouldn't use it as a primary headphone anyway.
Are there any cheap clones that use the same tiny design and high-isolation tips as the ER4s. It seems like it would be pretty cheap and easy to copy too, as its just a tiny aluminum barrel with a single BA driver inside (even using the genuine ER4s Knowles drivers, they only cost $20/pair on Aliexpress) and a MMCX connector glued at the end.
On that note, are there actually any cheap chinese single Balanced Armature earphones (not hybrid, 1BA only) at all? Why aren't they more common?