Can't believe it always happens to me. First time i ordered a KZ headphone was last year in 2017, the KZ ZS3. Arrived at home, the right earbud wasn't sounding. As i had bought it from amazon, they just shipped another sample and i returned the bad one back. Received a new KZ ZS3, same problem. Returned again, new sample was functioning but so uncomfortable. I returned it back and bought a memt x5 from aliexpress. Way better imho, but still a bit angry for the KZ ZS3 journey. EDR1 waa broken and didn't work when i ordered it. Now we're quite a year forward, ordered KZ ED9. Received it yesterday and was full of hope as i was curious to hear how they sound. I put the jack in my DAP: it seems like the right earbud just sounds at a lower volume than the right part, or maybe it just doesn't sound in the same way, i don't know. The left earpiece sounds great wether the right one is just so dark and low volume. I bought it from an ebay seller with a discount given by ebay for like 6$. Now i don't know 6$ are not so much money, but i don't know what to do if i can request a refund or not. Everytime i buy KZ products there's always a problem.