Grado Signature S550 Headphone (B-Stock, Factory Refurbished) headphone proprietary 2-pin Hugo HF+ (High Frequency roll

Hugo HF+ (High Frequency roll off) (Green)

The BTA1 transmitter adapts automatically to Dolby Digital or PCM/Stereo formats

The W9 is superior in its custom port tuned design

The independent rear acoustic chamber design makes channel matching to be more consistent

we are constantly adapting to the increasingly stringent requirements of manufacturing accuracy and stability

Grado Signature S550 Headphone (B-Stock, Factory Refurbished) headphone proprietary 2-pin Hugo HF+ (High Frequency rollThe Grado Signature S550 brings the core values of the Signature Line into a more streamlined and approachable form. Designed for listeners who value musical engagement as much as technical performance, the S550 delivers clarity, balance, and energy in a headphone built for long, immersive listening sessions. At its heart, the S550 is tuned to preserve the immediacy and openness Grado is known for, while offering a refined presentation that remains