The REL T/9x subwoofer combines a 10-inch FibreAlloy active driver, 10-inch passive radiator, and 300-watt Class A/B amplifier for fast, deep, high-fidelity bass. Its -6dB extension at 27Hz delivers substantial low-frequency authority for premium stereo music systems and home theaters. REL High Level, Low Level RCA, dedicated LFE, and optional Arrow wireless connectivity make the T/9x flexible enough for a wide variety of audio systems. With a refined high-gloss cabinet and precise musical performance, the REL T/9x is an audiophile subwoofer designed to add bass depth, dynamics, clarity, and scale without sacrificing system integration.
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REL T/9x Subwoofer

The REL T/9x is a premium high-fidelity powered subwoofer engineered to deliver deep, fast, and articulate bass for both two-channel music systems and home theater installations. As the flagship model in REL's Serie T/x range, it combines a front-firing 10-inch long-throw FibreAlloy active driver with a matching 10-inch down-firing passive radiator, creating greater scale and low-frequency authority while preserving the speed, texture, and clarity expected from a musical subwoofer. A powerful 300-watt RMS Class A/B MOSFET amplifier provides ample current reserves for demanding passages, while REL's redesigned driver suspension, increased cabinet volume, and refined internal damping improve dynamics, attack, control, and transparency.

REL's High Level Neutrik Speakon connection allows the T/9x to receive the same signal character as the main speakers for natural integration, while separate Low Level RCA and dedicated .1/LFE RCA inputs support preamps, powered speakers, AV receivers, processors, and home theater systems. The crossover is adjustable from 20Hz to 120Hz for the High and Low Level inputs, while the dedicated LFE path bypasses that crossover and uses the required 120Hz fourth-order filter. Optional REL Arrow wireless compatibility provides an alternative to long signal cables, and the high-gloss cabinet is available in Piano Black, Gloss White, or Gloss Grey finishes. With bass extension rated at -6dB at 27Hz, the REL T/9x is built for listeners who want meaningful low-frequency depth without sacrificing timing, detail, or system coherence.

What It's Good At:

• High-fidelity music reproduction: Fast driver response and controlled low-frequency output add bass extension, texture, dimensionality, and scale without overpowering the main speakers.
• Powerful home theater bass: A 300-watt Class A/B amplifier, 10-inch active driver, and 10-inch passive radiator deliver convincing impact and room-filling low-frequency energy.
• Seamless speaker integration: REL's High Level connection takes its signal from the main amplifier's speaker outputs, helping the subwoofer preserve the tonal and timing characteristics of the primary audio system.
• Deep bass from a relatively compact enclosure: Low-frequency extension reaches -6dB at 27Hz while the cabinet measures just 14.5 x 13.4 x 15.5 inches.
• Flexible system connectivity: High Level Speakon, Low Level RCA, dedicated LFE RCA, and optional REL Arrow wireless connectivity support a broad range of stereo and theater configurations.
• Premium system building: The T/9x can be used as a single subwoofer, as a matched stereo pair, or as part of a REL 3D theater configuration.

REL T/9x Subwoofer Full Specifications:

• Brand: REL Acoustics
• Series: Serie T/x
• Model: T/9x
• Product Type: Powered subwoofer / Sub-Bass System
• Configuration: Front-firing active driver with down-firing passive radiator
• Active Driver: 10 in. (250mm) long-throw FibreAlloy cone
• Active Driver Chassis: Steel
• Passive Radiator: 10 in. (250mm) long-throw FibreAlloy cone
• Passive Radiator Chassis: Steel
• Low-Frequency Extension / In-Room LF Response: -6dB at 27Hz
• Amplifier Power: 300 watts RMS
• Amplifier Type: Class A/B
• Amplifier Design: MOSFET
• Gain Control Range: 80dB
• High/Low Level Crossover Range: Variable from 20Hz to 120Hz
• Phase Control: 0 or 180 degrees
• High/Low Level Volume Control: Yes
• Dedicated .1/LFE Level Control: Yes
• High Level Input: Neutrik Speakon
• Low Level Input: (1) RCA
• LFE Input: (1) RCA
• Output Connectors: None / N/A
• Dual Parametric Filter: N/A
• High Level Input Impedance: 150,000 ohms
• High Level and LFE Simultaneous Operation: Supported
• LFE Filtering: Dedicated .1/LFE signal path uses a 120Hz fourth-order filter and does not pass through the High/Low Level crossover
• Crossover Application: High and Low Level inputs only
• Phase Control Application: High Level, Low Level, and .1/LFE inputs
• Wireless Capability: Compatible with optional REL Arrow wireless system, sold separately
• D.C. Fault Protection: Yes
• Output Short Protection: Yes
• Thermal Overload Protection: Yes
• Thermal Protection Recovery: Approximately five minutes after protection is triggered
• Standby/Always-On Control: Standby Mode switch is included on 220V units
• Power Draw When Switched Off Using Rear Power Switch: Zero
• Mains Input Voltage: 220-240V; 110-120V for certain markets
• Fuse, 220/230V Operation: 3.15A semi-delay
• Fuse, 115/120V Operation: 6.3A semi-delay
• Dimensions (W x H x D): 14.5 x 13.4 x 15.5 in. (370 x 340 x 393mm)
• Additional Depth With High Level Connector: 1.75 in. (44.5mm)
• Shipping Dimensions (W x H x D): 20 x 18 x 18 in. (506 x 460 x 465mm)
• Net Weight: 45.5 lb. (20.6kg)
• Shipping Weight: 50.0 lb. (22.65kg)
• Available Colors: Black, Grey, White
• Finishes: Gloss Piano Black, Gloss Grey Lacquer, or Gloss White Lacquer
• Finish Application: 5 coats
• Recommended Room Size: Approximately 150-400 sq. ft.
• Stereo-Pair Configuration: Supported; matching T/9x models are required for stereo operation
• REL 3D Configuration: Supported with compatible REL subwoofers
• Vertical Line-Array Stacking: Not supported
• Mains Lead: Included
• AC Power Cord: 6 ft. listed in product-page box contents
• Neutrik Speakon Interconnect: Included; manual specifies 10 meters (33 ft. 6 in.) nominal, while the product-page box contents list it as 32 ft.
• Grille: Included
• User Manual: Included

REL T/9x Subwoofer Q&A:

What improvements can the REL T/9x bring to a stereo or home theater system?

The T/9x adds deeper bass, greater scale, improved low-frequency texture, and stronger dynamics while maintaining the speed and clarity needed for high-fidelity music. Its 10-inch active driver, 10-inch passive radiator, and 300-watt Class A/B amplifier provide substantial output while remaining controlled and articulate.

Is the REL T/9x suitable for both music and home theater?

Yes. For music, the T/9x is designed to enhance bass extension, timing, texture, and soundstage; in home theater systems, it provides additional weight, impact, and realism while retaining REL's emphasis on fast, controlled bass.

Can the T/9x be combined with other REL subwoofer models?

Yes. Different REL models can be combined when creating a REL 3D theater system, although a stereo subwoofer pair should use two matching T/9x units to achieve proper stereo operation.

Can the REL T/9x operate wirelessly?

Yes. The T/9x is compatible with the optional REL Arrow wireless system, which is sold separately and provides a convenient solution for installations where running a signal cable is undesirable.

What room size is best suited to the REL T/9x?

REL recommends the T/9x for medium to large rooms of approximately 150 to 400 square feet. Actual performance will also depend on room geometry, placement, speaker system, listening level, and setup.

Can REL T/9x subwoofers be vertically stacked in a line array?

No. The T/9x is not designed for vertical line-array stacking, although it can be used successfully as a stereo pair or as part of a REL 3D system.

What connection options does the REL T/9x provide?

The T/9x includes REL High Level connectivity through a Neutrik Speakon input, one Low Level RCA input, and one dedicated .1/LFE RCA input. High Level and LFE inputs can also be operated simultaneously in appropriately configured home theater systems.

Does the REL T/9x include the cable needed for a High Level connection?

Yes. A Neutrik Speakon High Level cable is supplied with the subwoofer; the manual specifies a nominal 10-meter cable, while the current product-page box listing describes it as 32 feet.