Celest Gumiho Planar+BA IEM Review – New King Under $50? Celest is the new sub-brand of the well-known brand Kinera. The first Celest IEM model Gumiho has been announced at the beginning of September. Gumiho comes with a patented Square Planar Driver (SPD) driver using a brand new low-cost-high performance-high production yield design methodology to the traditional planar concept. This SPD driver is responsible for the low and mid frequencies and an additional custom BA (balanced armature) driver comes to … Continue reading Celest Gumiho Planar+BA IEM Review