I'm expecting gl400 to arrive next week. I was adamant on not buying more headphones but curiosity got the best of me. $75 planar is something never seen before.Interesting find! One of the cheapest full sized planar magnetic headphone. You can get this on the aliexpress too.
https://www.linsoul.com/products/gold-planar-gl600
Impedance 22ohms
Sensitivity 100dB
THD 0.25%@1KHZ/100dB SPL
Frequency 6Hz-50KhHz
Driver Nano Diaphragm planar driver
Weight 375g
Cable 1.5meter OFC 4 core cable
It's a shame they use same housing as many cheapo headphones but despite it's looks it's a rugged all metal build. I've had some headphones with that design.
Gold planar might be oem for monoprice. I red somewhere that drivers are different but headphones do look very similar.