This is a review, listening tests and detailed measurements of the 7Hz Salnotes Zero IEM. It was kindly donated by a member and costs US $22 ($20 on Amazon now).
The molded plastic looks cheep and the left and right markings barely visible. The included tip was extra soft/thin which may be a good thing for comfort but made for very difficult measurements. You could easily deform it to the point of it blocking most of the sound in the fixture. When I wore them on my ear though, the fit was excellent and with their light weight, I could barely feel them.
7Hz Salnotes Zero Measurements
Per above, I had a heck of a time measuring these IEMs but as if by magic, I toughed the off channel once and it created perfect fit and alignment with the other channel:
[ATTACH type="full" alt="7Hz Salnotes Zero IEM budget frequency response...