Grado S550 Signature Headphones

The Grado S550 Signature Headphones utilise a balanced 4-pin mini-XLR cable interface coupled with open-back dynamic architecture engineered for critical listening and audio analysis. Matched 50 mm S2 drivers sit within solid Brazilian walnut housings to deliver an authentic, wide-bandwidth frequency response ranging from 6 Hz to 44 kHz. Handcrafted in Brooklyn, this design merges precise driver calibration with an open-air topology that reproduces natural acoustic depth without pressure build-up.

The Hi-Fi Centre Team Take

The S550 Signature delivers an expansive acoustic environment that makes extended sessions feel completely effortless in a dedicated home setting. The dense Brazilian walnut chambers add an organic warmth to acoustic instruments while preserving pinpoint positional separation across the soundstage. With the breathable B cushions and balanced weight distribution across the headband, the physical presence of the chassis recedes during continuous listening. It serves as a focused reference instrument for domestic spaces where transparency and natural timbre take precedence.

Key Features

• Brazilian Walnut Chambers: Dense hardwood construction controls internal resonance to deliver rich low-frequency definition and natural midrange clarity.
• Matched S2 Drivers: Precision 50 mm dynamic transducers calibrated within 0.05 dB ensure an accurate, three-dimensional stereo image.
• Balanced Mini-XLR Interface: Detachable silver cabling terminates securely via 4-pin connections for clean signal transfer and modular cable changes.
• Authorized Dealer Guarantee: Hi-Fi Centre is an Authorized Dealer, ensuring authentic product origin, comprehensive manufacturer warranty protection, and dedicated support.

Technical Specifications

• Transducer Type: Dynamic
• Operating Principle: Open air
• Driver Size: 50 mm (matched within 0.05 dB)
• Frequency Response: 6 Hz – 44,000 Hz
• Nominal Impedance: 38 ohms
• Sensitivity (SPL 1 mW): 112 dB
• Total Harmonic Distortion (THD): <0.2% @ 100 dB
• Termination: 4-pin mini-XLR to 3.5 mm stereo jack (with 6.3 mm adapter)
• Ear Cushion Type: Grado B Cushions
• Chassis Weight: 335 g

Frequently Asked Questions

• Do the Grado S550 Signature headphones require a dedicated headphone amplifier?
  With a nominal impedance of 38 ohms and a high sensitivity rating of 112 dB, the S550 Signature can be driven effectively by portable audio devices and source outputs. However, pairing them with a dedicated headphone amplifier will maximise dynamic headroom, control, and acoustic resolution from the matched 50 mm drivers.
• What are the acoustic advantages of the open-back design?
  The open-air architecture prevents internal chamber reflections and air pressure build-up, allowing the transducers to move freely. This results in an authentic, expansive soundstage with realistic stereo imaging and transparency, ideally suited for critical listening in quiet environments.
• Can the audio cable be detached or upgraded?
  Yes. The S550 Signature features dual 4-pin mini-XLR connectors on the housings, offering a reliable balanced interface that accommodates effortless cable replacement or custom aftermarket terminations.