I bought these and the 7Hz Zero. Their FR is similar (no clue on distortion or sensitivity differences), and for <1/2 the price of the already cheap $50 TruthEar, it’ll be an interesting comparison.
Just got both in. Using just my iPhone and the Apple dongle. The dongle is able to power both of them easily. A lot of times I was 4 clicks from max (16 clicks total I think).
7Hz
Cable is slightly microphonic. The default red tips fit me. Didn’t see any L/R indicators on the cable, so had to check wiring. Shell and nozzle are good size [EDIT: The hard corner of the shell pushes against my ear slightly, so some discomfort after a while]. No carrying pouch.
Truthear
Much nicer packaging (very Apple like). Cable has essentially no microphonics (due to heat shrink instead of plastic?). The 2-pin connector is a bit long so it sticks up (the 7Hz connector is curved), but it sticks out (away from head) so doesn’t interfere with my glasses. The cable is long (maybe 3in longer than 7Hz) but very flimsy and I feel where it meets the heat shrink may be a stress point. Uses a 90° jack, which I personally don’t like. I had to use the smallest tip (small bore for more bass) for a snug fit. Shell is a tad bigger and nozzle is decently longer than 7Hz.
Despite the larger shell and nozzle, the Truthear still fits comfortably. I also own the Moondrop Starfield, and I just can’t wear those comfortably for a long time due to the shell shape/size (wore them on a flight once, hurt after).
As for sound, as one would expect from measurements, they sound pretty damn close!
The 7Hz has a smidge more low-end and the Truthear has a smidge more treble, both visible from measurements. Both have a similar soundstage and imaging. I have a terrible ear for distortion, but I’d say the 7Hz has slightly more bass distortion.
Honestly, besides knowing the fit, I’d have a hard time telling which was which (but I am far from a golden-ear).
Gun to my head, I think the 7Hz has slightly more body to vocals and they are slightly less forward (again, visible from measurements).
@amirm, I’d seriously suggest grabbing this $20 7Hz model and reviewing it.