Astell & Kern PD10 Digital Audio Player with Docking Cradle audio cables and adapters That is the reason for

That is the reason for the “hump” in that region

Handcrafted IEM Made in the USA

[* 2 Please note that you cannot operate the microphone / volume with earphones / headphones that have a microphone / volume operation function

Apex core assists the high-mid and high frequencies in creating a vast sonic landscape

This optimizes the ventilation of the driver's front and rear chambers to achieve clear mid-low range playback without distortion

Astell & Kern PD10 Digital Audio Player with Docking Cradle audio cables and adapters That is the reason forFrom Audio46: The DAP was briefly named PS10 before being changed to PD10 by Astell & Kern Astell & Kern PD10 Digital Audio Player with Docking Cradle World's First Application of AK4498EX in a DAP HEXA Audio Circuit Structure : Complete Separation of Digital and Analog Signal Processing Equipped with Impedance Adaptive Dual Amplifiers Automatic Amplifier Matching Mode: Smart Gain Overwhelming Audio Performance Through Independent Dual Audio Circuits