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Designed for
Excellence
Take in the design as a whole: horizontal
strakes carved into the side walls, elegant
elliptical returns that cradle handles finished
in a warm golden-silver, echoing raw titanium.
Everywhere you look, thoughtful details emerge—but
the purpose is clear. This generation delivers
the seemingly impossible: a larger cabinet that
is lower, wider, and deeper, yet visually
lighter. The added internal volume gives drivers
greater freedom and amplifiers improved
efficiency, while updated internal bracing keeps
cabinet resonances firmly under control. Subtler
touches also make a difference, badges that
disappear into the grille cloth, silver accents
that rest quietly within the cabinet plane, and
model numbers etched discreetly into the front
rails, visible only when stacked in a Line Array.
An optional Premium Wood Grille adds warmth and
individuality, while front-rail leveling
adjusters ensure effortless setup, even on
uneven floors. Together, these refinements
reflect REL’s philosophy that great design is as
much about thoughtful usability as it is about
beauty and performance.
Drive Faster.
Drive Better
The new S/550 10” high-amplitude driver has been
completely rebuilt—only the cast frame remains.
Its CarbonAlloy™ cone, capped with pure carbon
fiber, sharpens attack and smooths decay,
letting notes fade naturally into silence. A
redesigned suspension allows greater travel,
easily handling the amplifier’s added power. In
listening, the driver feels supple and
effortless, free from strain. Because it’s
lighter, the amplifier works less, yet delivers
more power, allowing the driver to move further
and play louder than ever before. The result is
nothing short of a revelation.
Amplified
Excellence
Rated at 550-watts, the Pure Class D amplifier
outpaces its predecessor – but numbers tell only
part of the story. In our lab, this unit
delivers 600-watts continuous with no strain for
extended periods of time, not simply for an
instant. Its crest power is fully 50% more than
its predecessor. It delivers the fast, truly
deep bass Serie S is known for, performance that
defies spec sheets. Premium polypropylene
capacitors, like those used in our Reference
models, were installed in our input filters
resulting in a more open soundstage with greater
transparency. We know from extensive experience
that this unit is a rugged and reliable
amplifier. As always, fed by our second
generation PerfectFilter™, the deep bass is
utterly remarkable for a subwoofer whose
footprint is so tidy.
Analog Filtered
to Perfection
We choose analog because it is the only way to
achieve truly natural sound. All REL input
filters are 100% analog—among the fastest ever
offered in a subwoofer. At the core is our
renowned High Level Input, which connects
directly to the speaker outputs of your main
amplifier. This doesn’t draw power; instead, it
carries the full sonic signature of your system,
allowing REL to blend seamlessly with your
speakers—a quality reviewers have praised for
decades. For systems where High Level isn’t
possible, our low-level input uses the same
analog filter circuit, available via both RCA
and XLR connections, to deliver the speed,
naturalness, and integration REL is known for.
And in theater or dual-use systems, REL uniquely
allows High Level and .1/LFE to run together—so
music benefits from natural integration, while
movies deliver the full impact intended by the
mix.
Serie S Line
Array
REL Line Arrays are celebrated for their sound
staging and dynamics, performance admired across
the high-end audio community. Like all REL Line
Arrays, they’re designed to grow with the
listener: start with a stereo pair, expand to
four, and ultimately build a full six-unit stack
for floor-to-ceiling authority. Precision
mechanical couplers lock each upper unit
securely to the anchor REL below, ensuring
stability and seamless integration. The S/550 is
the ideal entry into this world, delivering the
speed, nuance, and scale that define Line Array
performance. It offers a scalable foundation for
music and home theater enthusiasts looking to
experience the benefits of REL’s vertical bass
architecture in medium-sized rooms. As systems
expand, the S/550 reveals even greater depth and
dimensionality—vocals gain presence, instruments
bloom with lifelike realism, and cinematic
effects strike with powerful impact. A
state-of-the-art experience made accessible,
with the ability to grow over time.
Wired For
Sound…Wirelessly
Sometimes the best wire is no wire. Quality
cables are a given in high-end audio systems,
but there are occasions where it is impractical,
unsafe, or unsightly to drape a cable across the
room. REL delivers the ultimate solution with
Airship Direct™, our optional wireless system
that transmits wide-bandwidth, compound signals,
carrying both High Level and .1/LFE
simultaneously. Even with the scale and output
of S/550, Airship Direct™ preserves the speed,
transparency, and authority that define REL. It
allows seamless transitions between music and
movies without ever touching the controls, all
from a single module that plugs neatly into the
rear panel and stays invisible in your room.
Simple, direct, uncompromised: Airship Direct™.
Specifications
- Type: Front-firing active driver,
down-firing passive
- Active Driver Size & Material: 10 in. (250mm)
long-throw, CarbonAlloy™ cone structure, die
cast alloy
chassis
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Passive Radiator Size & Material: 12 in.
(305mm), Carbon/Carbon flat cone structure,
steel chassis
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Low Frequency Extension: -6 dB at 19Hz
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Input Connectors: High Level Neutrik Speakon,
Low Level (2) RCA, (1) LFE RCA, (1) LFE XLR
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Output Connectors: High Level Neutrik Speakon,
(1) Low Level RCA, (1) LFE RCA or (1) LFE XLR
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Power Output: 550 watts (RMS)
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Amplifier Type: Linear Class D
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Wireless Capability: REL AirShip Direct (sold
separately)
- Dual Parametric Filter: N/A
- Finish: Piano Black Lacquer, Gloss White
Lacquer 8 coats
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Dimensions:W x H x D 445 x 372 x 500 mm
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Net Weight: 31kg
Protection
System
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Fully Electronic Set Safe: Yes
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D.C. Fault: Yes
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Output Short: Yes
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Mains Input Voltage: 220-240 volts, 110-120
volts for certain markets
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Fuses: 8 Amp semi delay 220 volts operation, 15
Amp semi delay 120 volts operation
Supplied
Accessories
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Mains Lead: Yes
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Neutrik Speakon: Yes (10 Meters Nominal)
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Interconnect: -
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User Manual: Yes
Brochure
Manual
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