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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.
Passive Radiator
Supporting the active driver is an updated and redesigned down-firing passive radiator, purpose-built to handle the extreme throw distances created by the S/550’s upgraded amplifier and driver. Its flat, primary-piston surface, an evolution of carbon, glass fibre, and closed-cell foam construction—is now 40% stiffer and significantly lighter than before. With more than 2.4" (60mm) of travel in each direction, the passive extends dynamics, authority, and depth, completing a system that pushes well beyond expectations for its class.
Amplified Excellence
Rated at 550-watts, the Pure Class D amplifier outpaces its predecessor – but numbers tell only part of the story. In reps 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 Rels Reference models, were installed in reels input filters resulting in a more open soundstage with greater transparency.
Analog Filtered to Perfection
Real 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 reps 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.
Type
Front-firing active driver, down-firing passive
Active Driver Size & Material
10 in. (250mm) long-throw, CarbonAlloy™ cone structure, die cast alloy chassis
Passive Radiator Size & Material
12 in. (305mm), Carbon/Carbon flat cone structure, steel chassis
Low Frequency Extension
-6 dB at 19Hz
Input Connectors
High Level Neutrik Speakon, Low Level (2) RCA, (1) LFE RCA, (1) LFE XLR
Output Connectors
High Level Neutrik Speakon, (1) Low Level RCA, (1) LFE RCA or (1) LFE XLR
Power Output
550 watts (RMS)
Amplifier Type
Linear Class D
Wireless Capability
REL AirShip Direct (sold separately)
Dual Parametric Filter
N/A
Finish
Piano Black Lacquer, Gloss White Lacquer 8 coats
Fully Electronic Set Safe
Yes
D.C. Fault
Yes
Output Short
Yes
Mains Input Voltage
220-240 volts, 110-120 volts for certain markets
Fuses
8 Amp semi delay 220 volts operation, 15 Amp semi delay 120 volts operation
Supplied Accessories
Mains Lead
Yes
Neutrik Speakon
Yes (10 Meters Nominal)
Interconnect
-
User Manual
Yes
Dimensions
W x H x D
17.5 x 14.75 x 19.75 in.
(445 x 372 x 500 mm)
Net Weight
68 lbs. (31 kg)