From manufacturer's website: Weighty bass tones are realized with a full-range dual balanced armature driver unit. Employs a titanium 64 housing shaped using a 3D printer. This is a form that allows for realistic music reproduction while curbing unnecessary vibrations.

From the manufacturer's website: Piano Forte X has achieved the true spatial expression of a live concert hall, something that cannot be achieved with conventional earphones. The sound created contains a beautiful, attenuating vibration unique to the chrome copper material in the earphone...

From the manufacturer's website: The ACS Encore has been designed in conjunction with a well respected session musician and is designed for those who like a full on sounding IEM with hard hitting bass, detailed mids and crystal clear highs with plenty of headroom. The ACS Encore features the...

From the Final website: We think you will be surprised not only by the clarity and vividness, but also by the sense of realism imbued in the sound produced by these headphones, something that hasn’t been experienced in headphones until now. The 50 mm diameter driver unit with titanium...

The Private 333 is a 3 way crossover configuration, 3 Units, 3 drivers Custom In-Ear Monitor by Fitear.