Audio T Verdict
The Acoustic Energy AE309² combines the scale and bass authority of a floorstanding speaker with a slim cabinet that should fit comfortably into most living rooms.
Its paper and coconut-fibre drivers produce an engaging, natural presentation, while the soft-dome tweeter and heavily damped RSC cabinet give the speaker the refinement required to reveal worthwhile improvements elsewhere in the system.
It is an excellent middle ground between the compact AE300² and the considerably larger AE320², offering strong low-frequency extension without demanding an especially large room.
Acoustic Energy AE309² Floorstanding Speakers
The Acoustic Energy AE309² is a slim 2.5-way floorstanding loudspeaker from the redesigned Acoustic Energy 300 Series.
It combines two newly developed 120mm paper and coconut-fibre drivers with a 29mm fabric-dome tweeter, an 18mm RSC constrained-layer cabinet and a rear slot-shaped reflex port.
Designed for medium to larger listening rooms, the AE309² provides greater bass extension, scale and output than the AE300² standmount speaker while retaining a relatively narrow and room-friendly footprint.
Supplied as a Pair
The price shown is for one pair of passive Acoustic Energy AE309² floorstanding speakers.
A suitable stereo amplifier and speaker cable are required separately.
Completely Redesigned 300 Series
The AE309² is not a minor revision of the previous AE309.
Acoustic Energy redesigned the drivers, crossover, cabinet construction and external appearance, drawing on research undertaken during the development of the flagship Corinium loudspeaker.
The earlier ceramic-aluminium drivers have been replaced by paper and coconut-fibre units, while the new fabric-dome tweeter provides a different approach to high-frequency reproduction.
2.5-Way Driver Configuration
Both 120mm drivers contribute to the bass, but they do not reproduce exactly the same frequency range.
The lower driver is gradually filtered above 285Hz, while the upper driver continues through the midrange before handing over to the tweeter at 3.8kHz.
This 2.5-way arrangement combines the bass output and radiating area of two drivers with the more controlled midrange dispersion of a single unit operating alongside the tweeter.
Lower Driver
- Reproduces the bass frequencies
- Reinforces the upper driver at low frequencies
- Rolls off above 285Hz
- Adds useful scale and output
Upper Driver
- Reproduces bass and midrange
- Covers vocals and instruments
- Hands over to the tweeter at 3.8kHz
- Provides controlled midrange dispersion
Paper and Coconut-Fibre Drivers
Both 120mm cones use paper reinforced with coconut fibres.
Paper provides relatively low moving mass and useful natural damping, while the added coconut fibres improve stiffness and help control unwanted cone breakup.
This construction is intended to provide a natural midrange alongside the speed and control required for rhythmic bass.
An extended copper pole shield within the motor structure helps reduce midrange distortion, while a non-conductive voice-coil former supports bass extension and dynamic range.
29mm Fabric-Dome Tweeter
High frequencies are reproduced by a 29mm fabric-dome tweeter developed from technology created for Acoustic Energy's Corinium project.
Its relatively large dome is designed to combine speed, clarity and low distortion with a smooth, natural tonal balance.
The tweeter is positioned close to the upper mid/bass driver to help the two units integrate coherently around the crossover region.
Wide Dispersion Technology
Acoustic Energy's Wide Dispersion Technology waveguide controls how high-frequency sound spreads away from the tweeter.
It helps reduce diffraction from the surrounding cabinet and creates a broad listening area, allowing the AE309² to maintain a more consistent balance across several seats.
RSC Constrained-Layer Cabinet
The enclosure uses Acoustic Energy's 18mm Resonance Suppression Composite construction.
Layers of MDF and bitumen form a constrained structure designed to absorb cabinet vibration more effectively than a conventional single-material enclosure.
Reducing cabinet radiation allows more of the sound to come from the drive units, helping preserve clarity, stereo focus and low-frequency definition.
Each cabinet weighs 18.5kg, reflecting the substantial construction beneath its relatively slim exterior.
Rear Slot-Shaped Reflex Port
A wide slot-shaped reflex port is positioned on the rear of each cabinet.
The port uses air movement within the enclosure to extend the output of the twin drivers towards the lower end of the frequency range.
Its broad opening and carefully developed duct are designed to reduce turbulence and the audible chuffing that can affect smaller conventional ports.
As the port faces backwards, its distance from the rear wall will influence the amount and balance of bass.
Aluminium Feet and Spike Covers
The AE309² is supplied with aluminium feet and adjustable M8 floor spikes.
The feet create a wider and more stable base beneath the narrow cabinet, while the spikes allow each speaker to be levelled securely on suitable carpeted floors.
Protective spike covers are included for use on wooden, tiled, laminate and other delicate hard surfaces.
Room Positioning
Begin with the speakers approximately 20–40cm from the rear wall and positioned an equal distance from the main listening seat.
Moving them closer to the wall will normally increase bass weight, while bringing them further into the room may produce a cleaner and more open balance.
Avoid placing one speaker close to a corner while the other sits in open space, as this can produce noticeably different bass responses between the channels.
Both speakers should stand firmly, remain level and use the same distance from nearby walls where practical.
Toe-In and Stereo Imaging
Start with the AE309² facing forwards or angled gently towards the main listening position.
Increasing toe-in can improve the focus of central vocals and instruments, while reducing the angle may create a wider and more open soundstage.
Change the angle in small steps and use several familiar recordings before deciding on the final position.
Amplifier Matching
The AE309² has a sensitivity of 89dB and a nominal impedance of 6O.
These figures make it suitable for a broad selection of good-quality integrated, streaming and power amplifiers.
Its 120W power handling should not be interpreted as a required amplifier output. A lower-powered amplifier can work very well provided it remains clean and controlled at the required listening level.
Amplifier quality, current delivery, room size and preferred volume are more important than headline wattage alone.
Avoid Amplifier Clipping
An amplifier driven beyond its clean operating range can produce harsh distortion capable of damaging a loudspeaker.
Reduce the volume if the sound becomes strained, compressed or obviously distorted.
Single-Wire Speaker Connections
Each speaker uses one pair of terminals for a straightforward single-wire connection.
Maintain correct polarity throughout the system by connecting positive to positive and negative to negative.
Switch the amplifier off before connecting or changing cables and ensure that no loose strands can bridge the terminals.
AE309² or AE300²?
The
Acoustic Energy AE300²
uses one 120mm driver in a compact standmount cabinet.
The AE309² adds a second driver and considerably more internal cabinet volume, providing greater bass extension, output and room-filling scale without requiring separate speaker stands.
The AE300² may remain the better choice for smaller rooms or systems where a compact standmount speaker is preferred.
AE309² or AE320²?
The
Acoustic Energy AE320²
is the larger flagship floorstander within the 300 Series.
It uses a true three-way arrangement with a dedicated 120mm midrange driver and two larger 140mm bass drivers.
The AE320² provides greater bass extension, sensitivity and output for larger rooms, while the AE309² offers much of the same 300 Series technology in a smaller and more affordable cabinet.
Home Cinema Use
The AE309² can form the front left and right channels of an Acoustic Energy Home Cinema system.
The
Acoustic Energy AE307²
can provide a matching centre channel, while additional AE307² speakers may be used for compact surround installations.
The
Acoustic Energy AE Sub
can add the lowest bass and dedicated effects required by film soundtracks.
Available Finishes
The Acoustic Energy AE309² is available in Walnut, Silk-Touch Matte Black or Silk-Touch Matte White.
Each version features colour-matched trim, screen-printed branding and slim magnetic cloth grilles.
Clean the cabinets using a soft, dry cloth and avoid abrasive products, solvents and furniture polish.
Key Features
- Slim passive floorstanding speakers
- Supplied as a pair
- 2.5-way rear-ported design
- Two 120mm paper and coconut-fibre drivers
- Extended copper pole shields
- Non-conductive voice-coil formers
- 29mm fabric-dome tweeter
- Wide Dispersion Technology waveguide
- 285Hz and 3.8kHz crossover frequencies
- 18mm RSC constrained-layer cabinet
- MDF and bitumen cabinet construction
- Rear slot-shaped reflex port
- 33Hz–29kHz frequency range
- 89dB sensitivity
- 6O nominal impedance
- 120W power handling
- 112dB specified peak output
- Aluminium feet
- M8 floor spikes and protective covers
- Slim magnetic cloth grilles
- Walnut, Silk-Touch Matte Black or Matte White
Frequently Asked Questions
Are the AE309² speakers active?
No. They are passive speakers and require a separate stereo amplifier and speaker cable.
Is the price for a pair?
Yes. The Acoustic Energy AE309² is supplied as a pair.
What does 2.5-way mean?
Both 120mm drivers reproduce bass, but only the upper driver continues through the midrange before handing over to the tweeter.
Do the speakers require stands?
No. They are floorstanding speakers and are supplied with aluminium feet, spikes and protective spike covers.
Can they be placed close to a wall?
They can work reasonably close to a wall, but their rear ports benefit from some breathing space. Moving them closer will normally increase bass output.
Which amplifier should I use?
Their 89dB sensitivity and 6O nominal impedance suit a broad range of good-quality integrated and streaming amplifiers.
How do they differ from the AE300²?
The AE309² adds a second driver and a larger floorstanding cabinet for greater bass extension, scale and output.
How do they differ from the AE320²?
The AE320² is a larger three-way design with a dedicated midrange driver and two 140mm bass drivers. The AE309² is slimmer, smaller and more affordable.
Which finishes are available?
The AE309² is available in Walnut, Silk-Touch Matte Black and Silk-Touch Matte White.
Why Buy From Audio T?
- Experienced Acoustic Energy loudspeaker specialists
- In-store demonstrations through participating branches
- Help comparing the AE300², AE309² and AE320²
- Amplifier compatibility and system-matching advice
- Speaker cable and termination guidance
- Room positioning and toe-in assistance
- Home Cinema and subwoofer integration advice
- Professional delivery and installation options
- Ongoing system and setup support
Contact your local Audio T store
to arrange a demonstration or discuss suitable amplification for the Acoustic Energy AE309².