REL HT/1510 Predator II Home Cinema Subwoofer

The REL HT/1510 Predator II is the flagship model in REL’s dedicated Serie HT range.

It combines a large 380mm front-firing CarbonGlas driver with a 1,000W RMS amplifier, substantial sealed cabinet and low-frequency extension reaching 20Hz at the stated minus 6dB point.

Designed primarily for home cinema, gaming and multichannel music, the HT/1510 can be used as a powerful single subwoofer, as part of a multiple-subwoofer system or within an advanced vertical REL line-array installation.

Flagship Serie HT Performance

The HT/1510 Predator II sits above the HT/1003 MKII and HT/1205 MKII within REL’s cinema-focused range.

Its larger driver, increased amplifier output and greater cabinet volume allow it to reproduce demanding low-frequency effects with considerably more scale and dynamic headroom.

This makes it suitable for systems where deep bass needs to remain clean and controlled at higher playback levels or across a larger listening space.

380mm CarbonGlas Driver

The front-firing active driver uses REL’s CarbonGlas cone construction.

A lightweight glass-fibre primary cone is reinforced by an inverted carbon-fibre centre cap, combining low moving mass with the rigidity required to withstand powerful low-frequency movement.

The large 380mm radiating area allows the HT/1510 to move a substantial volume of air, helping create the pressure, scale and physical impact associated with cinema soundtracks.

A 75mm voice coil provides the control and power handling needed for demanding effects and extended high-output operation.

Closed-Box, Front-Firing Design

The HT/1510 uses a sealed cabinet with no reflex port or passive radiator.

Air trapped within the enclosure helps control the driver’s movement, supporting a fast response and avoiding the airflow noise that can occur with a heavily driven reflex port.

The front-firing arrangement directs output into the listening room and allows the cabinet to be used on a wide variety of firm floor surfaces.

20Hz Low-Frequency Extension

REL specifies low-frequency extension to 20Hz at minus 6dB.

This allows the HT/1510 Predator II to reproduce extremely deep information contained within modern film soundtracks, games, concerts and multichannel recordings.

The extension achieved at the listening position will also be influenced by room dimensions, placement, seating position and processor settings.

1,000W RMS Amplification

A 1,000W RMS amplifier powers the large CarbonGlas driver.

REL combines a substantial linear power supply with an efficient Class D output stage, providing the current delivery and headroom required for sudden cinematic peaks.

The high amplifier output allows the driver to reproduce demanding effects without the subwoofer immediately sounding compressed or strained.

Electronic Set-Safe, DC fault and output-short protection help protect the amplifier and driver under abnormal operating conditions.

Analogue PerfectFilter Technology

The HT/1510 Predator II uses REL’s analogue PerfectFilter circuitry to shape and extend its useful low-frequency response.

Fast analogue filters help preserve the speed and immediacy required for cinema while allowing the large driver to blend more convincingly with the main loudspeakers.

Dual parametric filtering also helps REL achieve a flatter response at the lowest frequencies while maintaining strong transient performance.

Protective Subsonic Filtering

An analogue subsonic filter operates below the subwoofer’s intended working range.

This reduces unnecessary driver movement caused by extreme infrasonic information that cannot be reproduced usefully within the room.

Controlling this unwanted movement helps preserve amplifier headroom and keeps the large driver stable during demanding soundtrack passages.

Dedicated RCA LFE Connection

For home cinema use, the designated RCA LFE input connects to the subwoofer output of a compatible AV receiver or surround processor.

This carries the dedicated low-frequency effects channel contained within film, television, concert and multichannel game soundtracks.

Bass management, crossover frequency, level and delay are normally controlled from the connected processor, with the REL’s controls used to complete the installation.

Balanced XLR LFE Connection

A balanced XLR LFE input is provided for compatible surround processors and professionally planned installations.

Balanced connection can be particularly useful when the processor and subwoofer are positioned a considerable distance apart or where the cable route passes close to other electrical equipment.

The connected processor must provide a suitable variable balanced subwoofer or LFE output.

Stereo Low-Level RCA Inputs

The two RCA sockets can also accept left and right low-level signals from a suitable stereo pre-amplifier, integrated amplifier, processor or active loudspeaker system.

In this arrangement, the HT/1510’s variable crossover control limits the upper frequencies reproduced by the subwoofer.

This allows the Serie HT model to support music systems where suitable variable line-level outputs are provided.

Daisy-Chain RCA and XLR Outputs

Corresponding RCA and balanced XLR outputs allow the incoming low-level or LFE signal to be passed to another compatible subwoofer.

This can simplify multiple-subwoofer and vertical-array installations by avoiding the need to run an individual signal cable from the processor to every cabinet.

Each connected subwoofer retains its own amplifier, level, crossover and phase controls and should be adjusted according to its individual position.

Variable Crossover Control

A variable low-pass crossover allows the HT/1510 Predator II to be adjusted for use with different loudspeakers and low-level sources.

When connected through the dedicated subwoofer output of an AV processor, the principal crossover is normally set within the processor’s bass-management menu.

For stereo low-level use, the REL crossover should be adjusted to blend with the natural low-frequency roll-off of the main loudspeakers.

Setting the crossover unnecessarily high can make the upper bass sound thick or allow the position of the subwoofer to become obvious.

Phase Adjustment

Phase adjustment helps align the movement of the REL driver with the main loudspeakers at the listening position.

The correct setting is normally the one that produces the strongest, most coherent bass without creating an obvious gap or excess around the crossover region.

AV receivers with automated room correction may also provide distance, delay and phase-related adjustment within their setup menus.

HT-Air MKII Wireless Compatibility

The HT/1510 Predator II is compatible with the optional REL HT-Air MKII wireless system .

HT-Air MKII carries a low-level or LFE signal using an uncompressed 5.8GHz wireless connection, avoiding the need for a long RCA cable across the room.

The transmitter connects to the AV receiver, processor or suitable variable line-level output, while the receiver connects to the REL.

Wireless transmission carries the audio signal only. The subwoofer and wireless units continue to require their appropriate power connections.

REL Airship II Compatibility

The HT/1510 can also be used with the REL Airship II wireless system .

Airship II can accept High Level, stereo low-level and LFE signals at its transmitter before sending the signal wirelessly to the receiver positioned beside the subwoofer.

When used with the HT/1510, the Airship II receiver connects to an appropriate low-level input. The subwoofer itself still does not gain a direct High Level Speakon socket.

Positioning the HT/1510 Predator II

Begin with the subwoofer along the same wall as the screen and front loudspeakers.

A corner position can increase output and low-frequency extension, while moving the cabinet away from the corner may produce smoother and more controlled bass.

Avoid enclosing the subwoofer tightly within furniture, obstructing the front driver or preventing ventilation around the amplifier panel.

Final placement should be determined by listening or room measurement rather than appearance alone.

AV Receiver Setup

1. Connect the receiver or processor’s subwoofer output to the REL’s RCA or balanced XLR LFE input.
2. Place the HT/1510 along the front wall in the intended starting position.
3. Set the REL level conservatively before running room correction.
4. Use the AV processor to select suitable loudspeaker crossover points.
5. Run the processor’s measurement and calibration routine where provided.
6. Check the resulting subwoofer level, distance and crossover settings.
7. Use familiar film and music material to complete fine adjustment.

Automated calibration is a useful starting point, but final listening checks remain important. Excessive output can make dialogue and effects sound heavy, while insufficient output reduces scale and impact.

Single HT/1510 or Multiple Subwoofers?

Two matching subwoofers are not used purely to make the system louder. Correctly placed and calibrated, they can produce smoother and more evenly distributed bass throughout the seating area.

Vertical REL Line Arrays

The HT/1510 Predator II is designed to support ambitious vertical installations using multiple matching cabinets.

Up to three HT/1510 units can be stacked using the correct REL rails, brackets and fixing hardware.

A vertical array can increase scale and output while distributing low-frequency energy over a greater part of the room’s height.

The considerable combined size and weight mean that the installation must be carefully planned and completed using suitable lifting assistance and the correct hardware.

REL HT/3D Home Cinema Systems

REL’s HT/3D approach uses multiple subwoofers to support different areas of a surround installation rather than relying entirely on one cabinet.

The HT/1510 can provide the main LFE impact, while additional compatible REL models support the front loudspeakers, centre channel or surround region.

The exact number, type and position of subwoofers should be planned around the room, speaker layout, processor capabilities and listening priorities.

HT/1003 MKII, HT/1205 MKII or HT/1510 Predator II?

BrilliantBrace Cabinet Construction

REL’s BrilliantBrace internal structure reinforces the cabinet and supports the rear of the large active driver.

The bracing helps reduce unwanted panel movement while controlling energy that would otherwise travel through the enclosure.

Full-depth lower rails provide a stable foundation for the cabinet and contribute to the HT/1510’s considerable overall rigidity.

Line-Grained Composite Cabinet

The cabinet body uses a horizontally oriented line-grained composite finish.

A substantial 15mm top plate receives multiple coats of hand-polished high-gloss lacquer, giving the large subwoofer a restrained appearance that complements REL’s other premium models.

Use a soft microfibre cloth for routine cleaning and avoid abrasive household cleaners.

System Matching

Browse our home cinema subwoofers , home cinema amplifiers , home cinema speakers , wireless accessories and subwoofer and system cables , or explore the REL range at Audio T .

Key Features

• Flagship active subwoofer developed for home cinema
• Closed-box cabinet with front-firing active driver
• 380mm long-throw CarbonGlas cone
• Glass-fibre main cone with inverted carbon-fibre centre cap
• 75mm voice coil
• 20Hz low-frequency extension at minus 6dB
• 1,000W RMS amplifier
• Linear power supply with Class D output stage
• REL analogue PerfectFilter circuitry
• Dual parametric filtering
• Protective analogue subsonic filtering
• Electronic Set-Safe protection
• Stereo low-level RCA inputs
• Dedicated RCA LFE connection
• Balanced XLR LFE connection
• RCA and XLR outputs for compatible daisy-chain systems
• Variable crossover adjustment
• Phase adjustment
• Compatible with REL HT-Air MKII
• Compatible with REL Airship II
• Suitable for single and multiple-subwoofer systems
• Supports dedicated vertical line-array installations
• BrilliantBrace internal cabinet construction
• Line-grained composite cabinet
• Hand-polished high-gloss top panel

Frequently Asked Questions