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What You Need to Know
What Is the Grado Signature S550?
The Signature S550 is an open-back, over-ear headphone from Grado Labs — the Brooklyn-based, family-run company that has been handcrafting headphones since 1953. It’s the newest and most affordable member of Grado’s Signature Line, which represents the brand’s premium tier of headphones. At $995, it sits below the Signature S750 ($1,695), S950 ($2,195), and flagship HP100 SE ($2,950).
If you’re not familiar with the term “open-back,” here’s what it means: the earcups allow air and sound to pass through rather than sealing everything in. The benefit is a wider, more natural-sounding presentation — music feels like it exists in a space around you rather than being trapped inside your head. The trade-off is that sound leaks in both directions, so open-back headphones are best used in quiet environments like a dedicated listening room, home office, or studio.
What Makes It Special: Wood, Driver Tuning, and the Grado Sound
The S550’s earcup housings are crafted entirely from Brazilian Walnut — a wood Grado has used for years because of its tonal characteristics and structural stability. Every pair is individually made, with natural grain variations that make each one unique. Beyond looking beautiful, the walnut housing plays an active role in shaping the sound. According to Grado, the density of walnut contributes to a fuller, more balanced presentation.
At the heart of the S550 is Grado’s 50mm S2 dynamic driver — the same driver platform found in the more expensive Signature S750. However, rather than simply dropping the same driver into a different shell, Grado says they specifically tuned the S2 driver to optimize its interaction with the walnut housing’s acoustic properties. The S750 uses an aluminum enclosure, which produces a different acoustic environment. The result, according to Grado, is that the S550 delivers a warmer, more forgiving presentation than the S750, while still maintaining the speed, detail, and openness that Grado listeners expect.
Grado describes the S550 as designed for listeners who want clarity and engagement without fatigue — a headphone you can wear for hours without feeling worn out by an aggressive or overly analytical sound. According to the manufacturer, the S550 offers a wide soundstage with precise imaging and natural dynamics.
Design, Comfort, and Build Quality
The S550 uses Grado’s updated Signature headband assembly. Inside the leather headband is a flexible metal support that lets you gently adjust the fit over time, so the headphone molds to your head shape the longer you use it. It features the same narrower leather strap introduced on the S750, along with engraved metal gimbals, stainless-steel height rods, reinforced junction blocks, and controlled housing rotation — all designed for long-term durability and comfort.
The headphone ships with Grado’s B cushions, which sit flatter on the ear to distribute pressure more evenly during extended listening. If you want to experiment with different sound and comfort profiles, the S550 is compatible with Grado’s full cushion lineup (S, F, L, and G cushions), each of which subtly influences both fit and sonic presentation.
At 335 grams without the cable, the S550 is light enough for multi-hour listening sessions without neck fatigue.
Detachable Cable System
In a welcome update from Grado’s legacy of permanently attached cables, the S550 uses a detachable cable system. Each earcup connects via a 4-pin balanced mini XLR connector, which means you can swap cables if one gets damaged, or upgrade to a different termination to match your equipment. The included Signature Silver cable is designed to be lighter, softer, and more flexible than Grado’s older cables. It terminates in a 3.5mm mini plug at the source end, and Grado includes a 6.3mm (1/4”) adapter in the box.
This gives you broad compatibility right out of the box — the 3.5mm plug works with portable players, phones, and laptop headphone jacks, while the 6.3mm adapter connects to desktop headphone amplifiers and hi-fi components. If you want to run a balanced connection, Grado offers optional cables with balanced terminations as separate accessories.
Who Is This Headphone Best For?
You want to experience Grado’s Signature Line without spending $1,695 or more — the S550 is the most affordable entry point at $995.
You prefer a warm, musical, fatigue-free sound that still delivers detail and speed — not an overly clinical or analytical presentation.
You listen in a quiet environment (home office, listening room, studio) where the open-back design can shine.
You value handcrafted quality and unique aesthetics — every pair features one-of-a-kind walnut wood grain.
You’re a Grado fan looking for a wood-housed Signature model, or you’re stepping up from a Grado Prestige or Statement Series headphone.
What’s in the Box
- Grado Signature S550 headphone with Brazilian Walnut housings
- Grado Signature Silver detachable cable (3.5mm termination)
- 6.3mm (1/4”) adapter
- B cushion earpads (installed)
Note: Packaging contents are based on Grado’s published information. If you need to verify whether additional accessories are included, give us a call.
What the Press Is Saying
Gear Patrol — March 2026
Gear Patrol highlighted that the S550 uses the same 50mm S2 dynamic driver as the $1,695 Signature S750 but is tuned specifically for its walnut enclosure, resulting in a warmer and more forgiving character. They noted it represents by far the most affordable entry into Grado’s Signature series.
What Hi-Fi? — Harry McKerrell, March 2026
What Hi-Fi? reported that the S550 joins the existing Signature S950 and flagship HP100 SE in Grado’s premium line. They noted that Grado aims for a more relaxed presentation while preserving the speed and immediacy found in the brand’s five-star-rated SR325x and GS3000x models.
ecoustics — March 2026
ecoustics observed that the S550 represents a meaningful shift in voicing for Grado — easing back from the brand’s traditionally forward presentation to introduce added warmth and a smoother top end. They also noted that with 38-ohm impedance and high sensitivity, the S550 should pair comfortably with portable players and desktop amplifiers alike, though it will likely benefit from a clean, capable source.
SoundGuys — March 2026
SoundGuys emphasized the value proposition: the S550 houses the same driver system as the S750 with refreshed tuning, at nearly half the price. They called it a significant development for listeners wanting Grado’s Signature-level build and sound at a more approachable cost.
Pairs Well With
The S550 sounds great straight out of the box with a 3.5mm connection, but a quality headphone amplifier or DAC will help it reach its full potential. Here are some companions to consider:
- Headphone Amplifiers: A dedicated headphone amp will give the S550 more dynamic headroom and tighter bass control. Browse our Headphone Amplifiers.
- DACs (Digital-to-Analog Converters): If you’re streaming from a computer or phone, an external DAC will dramatically improve sound quality over your device’s built-in audio. Check out our Digital-to-Analog Converters.
- Headphone Cables: The S550’s detachable 4-pin mini XLR system lets you upgrade or swap cables. Explore our Headphone Cables.
- Headphone Stands: Show off that walnut wood grain when you’re not listening. See our Headphone Stands.
Features & Specifications
Sound & Driver
50mm S2 Dynamic Driver — Grado’s latest driver platform, tuned specifically for the S550’s walnut enclosure. According to Grado, this pairing delivers a warm, detailed, and spatially open presentation with precise imaging and natural dynamics.
Open-Air Design — The open-back architecture lets air flow freely through the earcups, creating a wider, more natural soundstage. Music sounds more expansive and three-dimensional compared to closed-back designs. Best for quiet listening environments.
Extended Frequency Response (6 Hz – 44 kHz) — The S550 reaches well below and above the range of human hearing, ensuring that low bass notes and high-frequency overtones are reproduced accurately.
Materials & Build
Brazilian Walnut Housings — Each earcup is individually crafted from Brazilian Walnut, a wood valued for its tonal qualities and structural stability. Natural grain variations make every pair one of a kind. The walnut is sustainably sourced.
Signature Headband Assembly — A leather headband with an integrated flexible metal support allows you to gently shape the fit over time. Engraved metal gimbals, stainless-steel height rods, reinforced junction blocks, and controlled housing rotation ensure durability and long-term comfort.
Lightweight at 335g — Without the cable, the S550 weighs just 335 grams (about 11.8 oz), making it comfortable for extended listening sessions.
Cable & Connectivity
Detachable Cable System — 4-pin balanced mini XLR connectors at each earcup let you swap, replace, or upgrade cables as needed. Compatible with Grado’s growing ecosystem of aftermarket cables, including balanced options.
Signature Silver Cable Included — Grado’s latest cable design is lighter, softer, and more flexible than previous generations. Terminates in a 3.5mm mini plug with an included 6.3mm adapter for broad equipment compatibility.
Comfort & Customization
B Cushion Earpads — Ships with Grado’s B cushions, designed to sit flatter on the ear for more even pressure distribution. Compatible with Grado’s full cushion lineup (S, F, L, G cushions) so you can adjust fit and sound to your preferences.
Quick-Reference Specifications
| Audio Performance | |
| Transducer Type | Dynamic |
| Operating Principle | Open Air |
| Driver Size | 50 mm (S2 dynamic driver) |
| Frequency Response | 6 Hz – 44 kHz |
| THD (Total Harmonic Distortion) | <0.2% @ 100 dB |
| SPL (1 mW) | 112 dB |
| Nominal Impedance | 38 ohms |
| Driver Matching | 0.05 dB |
| Design & Build | |
| Housing Material | Brazilian Walnut (individually crafted) |
| Headband | Leather with integrated flexible metal support |
| Weight (without cable) | 335 g (11.8 oz) |
| Earpad | B Cushion (compatible with S, F, L, G cushions) |
| Cable & Connectivity | |
| Cable Type | Signature Silver, detachable |
| Headphone Connection | 4-pin Balanced Mini XLR (each earcup) |
| Source Connection | 3.5mm mini plug (6.3mm adapter included) |
Frequently Asked Questions
What does “open-back” mean, and is it right for me?
Open-back headphones allow air and sound to pass through the earcups, creating a wider, more natural soundstage that makes music feel spacious and three-dimensional. The trade-off is that sound leaks in both directions — people nearby can hear your music, and you’ll hear ambient noise. Open-back headphones are best for quiet home listening, dedicated listening rooms, or studios. If you need isolation for commuting or noisy environments, a closed-back headphone would be a better fit.
How does the S550 compare to the Signature S750?
Both use Grado’s 50mm S2 dynamic driver, but the S550’s driver is tuned specifically for its Brazilian Walnut housing, while the S750 uses an aluminum enclosure. According to Grado, the S550 delivers a warmer, more forgiving presentation, while the S750 leans slightly more forward and precise. The S750 ($1,695) also has a different aesthetic with its all-metal construction. The S550 ($995) is the most affordable way into Grado’s Signature Line.
Do I need a headphone amplifier to drive the S550?
The S550 has a 38-ohm impedance and 112 dB sensitivity, which means it’s relatively easy to drive. You can plug it directly into a phone, laptop, or portable player and get enjoyable sound. That said, a quality headphone amplifier or DAC/amp combo will give the S550 more dynamic headroom, tighter bass, and better overall refinement. If you’re investing at this level, a dedicated source is well worth considering. Give us a call at 800-942-0220 and we’ll help you find a great pairing.
Can I use a balanced cable with the S550?
Yes. The 4-pin balanced mini XLR connectors at each earcup support balanced cables. The S550 ships with a single-ended 3.5mm cable, but Grado offers optional balanced cables (with 4-pin XLR or 4.4mm Pentaconn terminations) as separate accessories. This is one of the advantages of the detachable cable system — you can match the cable to your amplifier’s output.
Can I swap the earpads to change the sound or comfort?
Absolutely. The S550 ships with Grado’s B cushions, which provide a balanced combination of comfort and sound. It’s also compatible with Grado’s S, F, L, and G cushion styles. Each cushion subtly influences both fit and sonic presentation — for example, larger cushions like the G pads can widen the soundstage, while smaller cushions bring the drivers closer for a more intimate sound. Experimenting with cushions is one of the fun aspects of owning a Grado.
Is every pair really unique?
Yes. Because the housings are crafted from real Brazilian Walnut, natural variations in wood grain mean no two pairs look exactly the same. This is a feature, not a flaw — it’s part of what makes each Grado a handcrafted, individual piece.
Where are these headphones made?
The Signature S550 is hand-assembled at Grado Labs in Brooklyn, New York. Grado has been building headphones in Brooklyn since the early 1990s, and the company traces its roots back to 1953 when founder Joseph Grado started making phono cartridges on a kitchen table.
What if I’m not sure the S550 is right for me?
Audio Advisor offers a 60-day money-back guarantee. Take your time, listen to your favorite music, and make sure the S550 is the right headphone for you. If it’s not, return it hassle-free. And if you have questions before buying, our team is here to help at 800-942-0220, weekdays 9am–6pm EST.
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