Design takes on new significance when it elevates commonplace items to a higher level. So it is with HT-Air MKII’s weighty, cubic wireless design that reinterprets the world-class form vocabulary of REL subwoofers and brings it home to everyday users.
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REL HT-Air MKII Wireless

The REL HT-Air MKII Wireless System brings fast, reliable wireless subwoofer connectivity to home theater and 2-channel audio systems without sacrificing the impact and dynamics that make deep bass convincing. Using REL's third-generation 5.8 GHz wireless technology and a dedicated, uncompressed transmission protocol, HT-Air MKII sends stereo Low Level or .1/LFE signals with an approximately 17 ms response time, providing performance that approaches a high-quality wired connection. Its rated wireless range extends to 40 ft (12 m) with clear line of sight, giving you greater freedom to position a compatible REL subwoofer where it performs best rather than where a long signal cable can reach. Stereo RCA connections support both 2-channel and home theater configurations, while automatic pairing, persistent pairing memory, and straightforward manual pairing controls make installation simple. A substantial cast-acrylic enclosure with five coats of hand-applied acrylic lacquer provides a premium gloss-black finish while helping the compact transmitter and receiver remain stable when connected to quality interconnects.

What It's Good At:

• Flexible Subwoofer Placement: A rated 40 ft (12 m) clear-line-of-sight wireless range helps position a subwoofer for better room integration without routing a long RCA cable.
• Preserving Bass Impact and Detail: Dedicated 5.8 GHz wireless transmission sends the signal without compression, helping maintain the dynamics and detail expected from a high-performance subwoofer system.
• Low-Latency Home Theater Performance: Approximately 17 ms response helps keep powerful bass effects closely synchronized with movies, games, and music.
• Fast, Simple Setup: Automatic pairing lets the transmitter and receiver connect quickly, while dedicated Pair buttons provide an easy manual option when needed.
• Home Theater and Stereo Versatility: Supports a single .1/LFE connection through the Right RCA channel or stereo Left/Right RCA connections for 2-channel applications.
• Premium, Stable Construction: The weighty cast-acrylic cases and five-coat hand-applied gloss finish deliver a refined appearance and help the units remain stable when substantial interconnects are attached.

REL HT-Air MKII Wireless Full Specifications:

• Product Name: REL HT-Air MKII Wireless
• Product Type: Wireless sub-bass transmitter and receiver system
• Primary Applications: Home theater .1/LFE and 2-channel stereo Low Level sub-bass transmission
• Intended Compatibility: REL Serie HT or similar REL sub-bass systems
• Wireless Frequency: 5.8 GHz
• Wireless Technology: Third-generation 5.8 GHz chipset with REL dedicated wireless protocol
• Transmission: Uncompressed, continuous real-time wireless audio streaming
• Approximate Response/Latency: Around 17 ms
• Wireless Effective Distance: 40 ft (12 m) with clear line of sight; greater range may be possible under ideal conditions
• Transmitter Inputs: Stereo RCA Left/Right
• LFE Input: Right RCA channel only
• Receiver Outputs: Stereo Left/Right RCA or LFE connection to a compatible REL subwoofer
• Input Impedance: 10 kΩ
• Wireless Output Power: 0 dBm
• Pairing: Automatic pairing with dedicated manual Pair buttons on transmitter and receiver
• Pairing Confirmation: Pair LEDs remain continuously illuminated when successfully paired
• Manual Pairing Time: LEDs should stop flashing and remain solid within approximately 5 seconds after successful manual pairing
• Pairing Memory: Persistent; pairing is retained when the units are unplugged
• LED Status - Paired: Continuously on
• LED Status - Looking for Pair: Blinks twice per second
• LED Status - Standby: Blinks once per second
• Power Input: 5V DC
• Power Connector: 5.5 mm circular connector, center positive
• Power Consumption: 600 mW
• Power Requirement: Transmitter and receiver each require power using the supplied AC-to-DC wall adapters
• Dimensions (W x H x D): 2.75 x 2.06 x 3.25 in. (70 x 53 x 82.3 mm)
• Finish: Black
• Enclosure: Cast acrylic
• Exterior Finish: Five coats of hand-applied acrylic lacquer
• Included Power Adapters: 2
• Included RCA Cables: 2
• RCA Cable Length: 2 meters each
• Simultaneous Wired/Wireless Operation: Not permitted; using direct wired and HT-Air MKII wireless connections simultaneously may cause damage and void warranties
• FCC Compliance: Complies with FCC Part 15 requirements
• Recommended RF Exposure Separation: Minimum 20 cm between the wireless transmitter and the body
• Active Driver Size & Material: No value listed by the manufacturer; not a powered subwoofer
• Passive Radiator Size & Material: No value listed
• Low-Frequency Extension: No value listed
• Amplifier Type: No value listed
• Dual Parametric Filter: No value listed
• Fully Electronic Set Safe Protection: No value listed
• D.C. Fault Protection: No value listed
• Output Short Protection: No value listed
• Fuses: No value listed
• Net Weight: No value listed by the manufacturer

REL HT-Air MKII Wireless Q&A:

What does the REL HT-Air MKII Wireless System do?

It wirelessly sends sub-bass audio from a home theater processor, stereo preamp, or compatible powered-speaker system to a REL subwoofer, helping eliminate the need to run a long RCA signal cable across the room.

Can the HT-Air MKII be used for both home theater and 2-channel music systems?

Yes. For home theater, the Right RCA connection is used for the .1/LFE signal. For stereo applications, both Left and Right RCA connections can be used for 2-channel Low Level transmission.

How far can the HT-Air MKII transmit a wireless subwoofer signal?

The specified effective range is 40 ft (12 m) with clear line of sight. REL notes that greater distances may be possible in ideal installation conditions.

Does wireless operation introduce noticeable delay?

HT-Air MKII has a response time of approximately 17 ms and uses an uncompressed dedicated wireless protocol designed to preserve the dynamics and timing of sub-bass information.

How difficult is it to pair the transmitter and receiver?

Pairing is designed to be simple and can occur automatically after the powered transmitter and receiver are connected. If manual pairing is needed, press the Pair button on the receiver followed by the Pair button on the transmitter; the LEDs remain solid when pairing is complete.

Will I have to pair the HT-Air MKII again after unplugging it?

No. Pairing is persistent, so the transmitter and receiver retain their pairing after they have been unplugged.

Can I use a direct RCA connection and the HT-Air MKII wireless connection at the same time?

No. REL specifically states that wired and HT-Air MKII wireless connections should not be used simultaneously because doing so could cause damage and void warranty coverage.

What comes with the REL HT-Air MKII Wireless System?

The system includes the wireless transmitter and receiver, two power adapters, and two 2-meter RCA cables for connection to the source equipment and subwoofer.

REL HT-Air MKII Wireless Downloads:

REL HT-Air MKII Wireless Manual