Grado Signature S550 Headphone (Open Box) phono stage and immersive experience that awakens

and immersive experience that awakens the senses of the listener

4 x XLR/TRS Mic/Inst/Line

5mm single-ended and 4

Proprietary fully balanced modified IC pre-amplifier

One key controls switching between the four different inputs

Grado Signature S550 Headphone (Open Box) phono stage and immersive experience that awakensThe 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