Looks like another winner for HELM.
The HELM DB12 AAAMP Mobile Headphone Amplifier is a game changer for powering your favorite headphones. It is a first of its kind plug-and-play amplifier that works with any pair of 3.5mm wired headphones and offers+12 dB of zero distortion volume gain, improved stereo imaging and clarity (true linear amplification), and a user-controlled +6 dB bass boost. Powered by THX AAA technology and THXⓇ Certified, the DB12 AAAMP delivers studio-quality analog (not digital) amplification to any wired headphones from your Android, iOS, MacOs or PC It offers the ideal portable hi-fi audio solution with over six hours of mobile play time.