Fostex T50RP 50th Anniversary Limited Edition Semi Open-Back Headphones - Discontinued headphone 6.3mm The JBL Boombox 3 is

The JBL Boombox 3 is IP67 dustproof and waterproof

the distortion generated by the driver unit (speaker part) inside the earphone is 1% or more in the low range even with excellent products

a power supply IC configured for each audio block

While we haven't yet heard the new headphones

Rigid aluminum milled frame for improved sound quality

Fostex T50RP 50th Anniversary Limited Edition Semi Open-Back Headphones - Discontinued headphone 6.3mm The JBL Boombox 3 isT50RP 50th Anniversary Limited Edition Features Using the same high grade drivers as the T60RP, the newly developed yoke panels offer more efficient magnetic transmission for better linearity. A dedicated damper is installed inside the housing to reduce unwanted resonance. The right side housing has "50th anniversary" in Japanese letters. The sliders are painted gold. Synthetic leather around the ear type ear pads offer great fitting and fatigue free