Linsoul, have got back to me about the balance in the DM7 and have said that it has been fixed. Now I am hoping that they mean not just mine that I sent back but all DM7s because for the price the sound is great, and what came with the DM7 was of high quality. I guess I could have paid more and got the Fiio FH7, and known that QC would have been good. But Linsoul have accepted responsibility, agree to cover my return cost and only wanted me to send the left IEM back. I am unsure what I will get back from them, either a new DM7 or just a replacement left IEM. Either way, I knew it would be a risk but for the price, it was a risk I was willing to take, and if Linsoul do send back a QC DM7, I will be happy.