So these are not going to disappoint given the sub $20 cost. I upgraded everything o make these work for me, but using the included accessories it was not good. The tips collapsed to easily and the cable for the Blue Special Edition was uncomfortable and easily tangled. I upgraded the cable to a balanced 4.4mm and tips to the Moondrop Spring Tips. Those changes resulted in a better seal and spacious sound stage. The tone is more a balanced signature and not for bass heads, but that doesn’t mean bass is absent it’s just a mature amount of bass. I wonder what they consider open back, because these are sealed shut. I don’t know if my set is defective but it works. Now given all that it takes an additional cost in fact at least twice the cost to make these work. Over ear hook cables are the worst for these, they will angle the IEM’s out of alignment to your ear canal. The cable you’ll need is one intended for bullet styles. The only cables from Linsoul that would work may be from DDHIFI. Out of the box not great, but if you have the funds and patience it’ll be okay.