Audio T Verdict
The Acoustic Energy AE Sub is a powerful but sensibly proportioned active subwoofer designed to add deeper, more convincing bass to both stereo and home cinema systems.
Its sealed cabinet, downward-firing 12-inch driver and 250W Class D amplifier give it the control required for music, while its dedicated LFE input and strong low-frequency output make it equally useful for films and television.
Flexible stereo line-level, high-level and LFE connections mean it can be added to a wide range of systems. Once its level, crossover and phase are correctly adjusted, it should support the main loudspeakers without constantly drawing attention to itself.
Acoustic Energy AE Sub Active Subwoofer
The Acoustic Energy AE Sub is a sealed-box active subwoofer for Hi-Fi and Home Cinema systems.
It combines a downward-firing 12-inch high-excursion driver with a built-in 250W RMS Class D amplifier, extending bass response down to a specified 26Hz.
Originally developed as a natural partner for Acoustic Energy's 100 and 300 Series loudspeakers, the AE Sub can also be integrated with many other compact standmount and floorstanding speakers.
It is available in Matte Black or Matte White to complement a broad range of loudspeakers, furniture and room finishes.
Deeper Bass for Music and Films
Many conventional loudspeakers cannot reproduce the lowest frequencies contained in music and film soundtracks with their full weight and scale.
Adding a correctly adjusted subwoofer allows the system to reproduce deeper bass without asking the main loudspeakers to produce frequencies beyond their natural limits.
With music, this can add greater authority to bass guitars, drums, organs, synthesisers and orchestral recordings. In a home cinema system, it can reproduce the dedicated low-frequency effects channel used for impacts, explosions and other large-scale effects.
The goal is not simply to produce more bass. A properly integrated subwoofer should extend the system smoothly while preserving the timing, clarity and tonal balance of the main speakers.
12-Inch Downward-Firing Driver
The AE Sub uses a 12-inch high-excursion paper-cone bass driver positioned on the underside of the cabinet.
Its cone is doped and stiffened to help it remain controlled as it moves the large volume of air required to reproduce low frequencies.
High excursion allows the driver to travel further forwards and backwards than a conventional mid-bass unit while maintaining useful output at lower frequencies.
The downward-firing arrangement directs energy towards the space between the cabinet and floor, using the supplied feet to maintain the clearance required for the driver to operate.
Do Not Block the Driver
The bass driver is located beneath the cabinet and requires clear space between the subwoofer and the floor.
Always use the supplied feet or spikes and do not place the AE Sub directly on thick fabric, loose material or another surface that could obstruct the driver.
Sealed Cabinet Design
The driver operates within a sealed enclosure rather than a cabinet using a bass-reflex port.
A sealed design uses the enclosed air inside the cabinet as part of the driver's suspension and avoids airflow from a reflex port.
This suits the AE Sub's aim of delivering deep but controlled bass for both music and film use.
The cabinet measures 360mm in each direction, giving the subwoofer a compact cube-shaped footprint despite its substantial 12-inch driver.
250W RMS Class D Amplifier
A built-in Class D amplifier provides 250W RMS to the bass driver.
Because the amplifier is designed specifically for the driver and enclosure, the main Hi-Fi or AV amplifier does not need to provide the power used by the subwoofer.
Class D amplification offers high electrical efficiency, making it well suited to delivering the substantial power required for low-frequency reproduction within a compact cabinet.
Flexible System Connections
The AE Sub provides three different connection methods, allowing it to work with stereo amplifiers, network music systems and home cinema receivers.
Stereo RCA Inputs
- For amplifiers with variable pre-amplifier outputs
- Left and right line-level connections
- Suitable for stereo Hi-Fi systems
- Allows both channels to feed the subwoofer
High-Level Inputs
- For amplifiers without a dedicated subwoofer output
- Connects from compatible speaker terminals
- Uses stereo binding-post connections
- Allows integration with traditional amplifiers
LFE Input
- For AV receivers and home cinema processors
- Single RCA connection
- Carries the dedicated low-frequency effects channel
- Suitable for bass-managed cinema systems
Stereo Line-Level Connection
The stereo RCA inputs can be used with an amplifier or pre-amplifier providing variable left and right pre-out connections.
This method is particularly useful in a stereo system because it sends information from both channels to the subwoofer.
The main loudspeakers normally remain connected directly to the amplifier, while the AE Sub adds low-frequency output according to its crossover and level settings.
High-Level Speaker Connection
The high-level inputs allow the AE Sub to be used with a compatible amplifier that does not provide a line-level subwoofer or pre-amplifier output.
Speaker cable is connected from the amplifier's speaker terminals or compatible second-speaker output to the AE Sub's high-level binding posts.
This input takes only the signal information required by the subwoofer and does not replace the AE Sub's internal 250W amplifier.
Check Amplifier Compatibility
Some modern Class D, bridged or balanced amplifiers have speaker-output arrangements that require particular care when connecting a high-level subwoofer input.
Contact Audio T before connecting the AE Sub to an unfamiliar amplifier or combining speaker cables at its output terminals.
LFE Connection for Home Cinema
The dedicated LFE RCA input connects to the subwoofer or LFE output of a compatible AV receiver or surround processor.
In this arrangement, bass management and crossover settings may be controlled partly or entirely by the AV receiver.
Speaker sizes, crossover frequencies, subwoofer distance and output level should be configured within the receiver before final listening adjustments are made.
Adjustable Crossover
The rotary low-pass control can be adjusted between 40Hz and 180Hz.
This determines the highest frequencies reproduced by the AE Sub through connections where its internal crossover is active.
Larger floorstanding speakers will normally require a lower crossover setting than compact standmount or satellite speakers.
The best setting is the one that creates a smooth transition between the subwoofer and main speakers without making bass sound detached or overly prominent.
Subwoofer Level Control
The level control adjusts how loudly the AE Sub plays relative to the main loudspeakers.
Begin with a conservative setting and use familiar music containing natural, consistent bass while making small adjustments.
Excessive level can make every recording sound heavy and obscure midrange detail. Too little level may leave an obvious gap between the subwoofer and speakers.
0° and 180° Phase Control
The phase switch provides 0° and 180° settings.
Changing phase reverses the timing relationship between the AE Sub driver and the main loudspeakers.
The most suitable setting depends on the relative position of the subwoofer, speakers and listening seat. Use the setting that produces the strongest and most even bass around the crossover region rather than simply the greatest amount of bass overall.
Automatic Signal Sensing
The automatic power function places the AE Sub into standby when no input signal is detected.
When playback begins and an audio signal reaches the selected input, the subwoofer switches into operation automatically.
This avoids the need to operate the rear power control each time the system is used while reducing unnecessary power use between listening sessions.
Choosing the Best Position
Deep bass spreads through a room less directionally than midrange and treble, giving greater freedom when positioning a subwoofer.
However, the room still has a major effect on bass level and evenness. Moving the AE Sub towards a wall or corner will normally increase its output, but may also exaggerate particular frequencies.
Begin near the front loudspeakers or a front wall, then experiment before deciding on the final position.
Leave enough space behind the cabinet to reach the controls and allow connected cables to bend without strain.
Try Moving the Subwoofer
- Closer to or further from the rear wall
- Away from an enclosed cabinet
- Along the front wall
- Closer to one main loudspeaker
- Away from a room corner if bass becomes heavy
Adjust One Setting at a Time
- Confirm the physical position first
- Set the crossover frequency
- Adjust the output level
- Compare the two phase settings
- Recheck using several recordings
Spikes and Rubber Floor Protectors
The AE Sub is supplied with sturdy carpet-piercing spikes for stable placement on carpeted floors.
Rubber caps are also provided for use on hard flooring, helping protect wood, laminate, stone and other surfaces.
Whichever option is used, the cabinet should stand firmly without rocking and must maintain sufficient clearance beneath the downward-firing driver.
Designed for Acoustic Energy Systems
The AE Sub was developed to complement Acoustic Energy's 100 and 300 Series loudspeakers.
It can add useful low-frequency extension to compact models such as the
Acoustic Energy AE300²
,
or provide additional depth and impact alongside larger floorstanding speakers.
It is also a natural home cinema partner where matching Acoustic Energy front, centre and surround speakers are used.
The flexible crossover and connection options mean it is not restricted to Acoustic Energy speakers, provided the complete system is set up correctly.
Matte Black or Matte White
The AE Sub is available in Matte Black and Matte White.
These understated finishes match current Acoustic Energy ranges and help the relatively compact cube-shaped cabinet sit discreetly within a living room or cinema system.
Key Features
- Active subwoofer for Hi-Fi and Home Cinema systems
- Sealed-box cabinet design
- Downward-firing bass driver
- 12-inch high-excursion paper cone
- Doped and stiffened driver construction
- 250W RMS built-in Class D amplifier
- Specified frequency response down to 26Hz
- Stereo low-level RCA inputs
- Dedicated RCA LFE input
- Stereo high-level speaker inputs
- Variable 40–180Hz crossover control
- Adjustable subwoofer level
- Switchable 0° or 180° phase
- Automatic signal-sensing power mode
- Compact 360mm cube-shaped cabinet
- Carpet-piercing spikes included
- Rubber caps included for hard floors
- Available in Matte Black or Matte White
- Designed to complement Acoustic Energy 100 and 300 Series speakers
Frequently Asked Questions
Is the Acoustic Energy AE Sub suitable for music?
Yes. Its sealed enclosure, adjustable crossover, level control and phase switch allow it to be integrated with a stereo Hi-Fi system.
Can it be used for Home Cinema?
Yes. It includes a dedicated RCA LFE input for connection to a compatible AV receiver or surround processor.
Does it contain its own amplifier?
Yes. The AE Sub contains a 250W RMS Class D amplifier matched to its 12-inch bass driver.
Can it connect to an amplifier without a subwoofer output?
Yes. Its high-level speaker inputs can be used with many compatible amplifiers that do not provide a dedicated line-level subwoofer connection.
What is the lowest frequency it can reproduce?
Acoustic Energy specifies a frequency response extending down to 26Hz at the stated ±6dB tolerance.
What does the crossover control do?
It determines the highest frequencies reproduced by the subwoofer, helping it blend with the natural bass roll-off of the main speakers.
What does the phase switch do?
It changes the relationship between the movement of the subwoofer driver and the main speakers. Choose the setting that produces the smoothest and most even bass at the listening position.
Does the subwoofer switch on automatically?
Yes. Its automatic mode detects an incoming signal and switches the AE Sub from standby into operation.
Can it be placed on a hard floor?
Yes. Rubber caps are supplied for use over the feet on suitable hard flooring.
Can I place it directly on thick carpet?
Use the supplied spikes so that the cabinet remains stable and the downward-firing driver has the clearance it requires.
Which finishes are available?
The AE Sub is available in Matte Black or Matte White.
Can Audio T help set it up?
Yes. Audio T can advise on connection, positioning, crossover, phase and level settings for both stereo and home cinema installations.
Why Buy From Audio T?
- Experienced Hi-Fi and Home Cinema specialists
- Demonstrations through participating Audio T stores
- Help matching the AE Sub to your loudspeakers
- Advice on RCA, LFE and high-level connections
- Amplifier compatibility checks
- Subwoofer cable guidance
- Room placement advice
- Crossover, level and phase setup
- AV receiver bass-management configuration
- Integration with Acoustic Energy 100 and 300 Series systems
- Home demonstration options where suitable
- Professional delivery and installation options
- Part exchange available on suitable existing equipment
- Ongoing system support
Contact your local Audio T store
to arrange a demonstration or discuss the best position and connection method for the Acoustic Energy AE Sub.