Grado Signature S550 Headphone (B-Stock, Factory Refurbished) 4.4mm male 0011% @ 0dBFS (BAL/SE) Outputs

0011% @ 0dBFS (BAL/SE) Outputs Balanced 4

and pairing is easy

5 mm (shared with PO) BAL LO 4

see and feel – that’s what the HD 599 is about

HYMALAYA PRO R2R DAC: Equivalent to two PCM1704K balanced connections

Grado Signature S550 Headphone (B-Stock, Factory Refurbished) 4.4mm male 0011% @ 0dBFS (BAL/SE) OutputsThe 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