Acoustune is a Japanese audio company founded in 2013 and they specialize in making in-ear monitors. Their iems are of a single dynamic driver configuration. I would like to thank Acoustune for the review unit of the HS1551 CU. More information can be found on Acoustune official website, Acoustune .



  • Driver Configuration: 10mm Dynamic Driver
  • Frequency Response: 10 Hz – 25 kHz
  • Sensitivity: 110 dB/mW
  • Impedance: 32 ohm

Unboxing & Accessories

The HS1551 CU comes in a black package with a black protective cover that sports the brand logo, description and image of the iem at the front. At the back of the protective cover, there are specifications and description of the model. There is metal hard case with the brand logo on top in the black package. After unlocking the case, there are the iem, cable, instruction manual, warranty card, a variety of tips [ AET02 (F), AET06 (S+/M+), AET07 (S/M/L), AET08 (S/M/L) ] and a brown leather carrying case that contains a leather cable wrap and a velcro cable tie. There is a great amount of accessories provided and there is a premium feel to them.



Page 2: IEM Build & Design, Cable Build & Design