Acoustic Energy AE109² Floorstanding Speakers

The Acoustic Energy AE109² is a slim 2.5-way floorstanding loudspeaker from the second-generation Acoustic Energy 100 Series.

It combines two 130mm paper-cone drivers with a 25mm soft fabric-dome tweeter, a rear slot-shaped reflex port and a rigid 15mm High Density Fibreboard cabinet.

The narrow enclosure occupies little more floor space than a compact standmount speaker and its stand, but provides the additional cabinet volume and driver area needed for greater bass extension, scale and room-filling output.

The AE109² is supplied as a pair and requires connection to a suitable stereo amplifier using speaker cable.

2.5-Way Driver Configuration

The AE109² uses a 2.5-way crossover arrangement rather than operating both 130mm drivers across exactly the same frequency range.

Both paper-cone drivers contribute to the bass, providing greater radiating area and output than a single-driver design.

The lower driver is gradually filtered above 275Hz, while the upper driver continues through the midrange before handing over to the tweeter at 2.5kHz.

This arrangement combines the bass weight of two drivers with the more controlled midrange dispersion of a single unit operating alongside the tweeter.

Twin 130mm Paper-Cone Drivers

Both 130mm drivers use doped paper cones and high-force, long-throw motor systems.

Paper offers a useful balance of low moving mass and natural self-damping, allowing the upper driver to reproduce voices and instruments smoothly while both units contribute to lower-frequency performance.

The long-throw construction allows the cones to move through a greater distance when required, helping the slim speaker produce convincing volume and bass impact.

Acoustic Energy developed the drivers alongside the crossover and tweeter to create consistent phase, timing and tonal integration throughout the speaker.

25mm Soft-Dome Tweeter

High frequencies are reproduced by a 25mm fabric-dome tweeter powered by a neodymium motor assembly.

The soft dome is designed to deliver clear treble detail while retaining a smooth and approachable balance during longer listening sessions.

Acoustic Energy positions the drivers close together on the front baffle, helping the sound from the upper mid/bass unit and tweeter combine more cohesively around the crossover region.

Wide Dispersion Technology

The tweeter is mounted within Acoustic Energy's Wide Dispersion Technology waveguide.

Its shaped profile controls the spread of high-frequency energy and helps match the tweeter's dispersion to that of the neighbouring paper-cone driver.

This supports a broader and more consistent listening area, making the AE109² suitable for rooms where more than one person may be listening.

Rear Slot-Shaped Reflex Port

A wide slot-shaped reflex port is positioned on the rear of each cabinet.

The port uses the movement of air inside the enclosure to reinforce the lower-frequency output of the paper-cone drivers.

Its broad opening and shaped internal vent are designed to smooth airflow and reduce the turbulence or chuffing that can affect smaller conventional ports.

Because the port faces backwards, the distance between the speakers and rear wall will affect the amount and balance of bass.

15mm HDF Cabinet

The AE109² cabinet is manufactured from 15mm High Density Fibreboard with carefully positioned internal bracing.

HDF provides useful mass and stiffness while allowing relatively thin cabinet panels, creating more internal air volume without making the speaker unnecessarily wide.

The bracing helps control unwanted panel vibration, allowing voices, instruments and bass notes to be reproduced with greater clarity.

Despite measuring only 165mm wide, each finished speaker weighs 16kg, reflecting the substantial construction within the slim enclosure.

Compact Floorstanding Design

At 860mm high and 165mm wide, the AE109² is relatively discreet for a floorstanding speaker.

It does not require separate speaker stands and occupies a similar floor area to many standmount speakers once their supports are included.

The additional cabinet volume allows it to reach a specified 41Hz, giving music greater scale and low-frequency authority than the smaller Acoustic Energy AE100² .

Room Positioning

Begin with the speakers positioned approximately 20–30cm from the rear wall and arranged an equal distance from the main listening position.

Moving them closer to the wall will usually increase bass weight, while bringing them further into the room may create a cleaner and more open balance.

Avoid placing one speaker close to a room corner while the other sits in open space, as this can create noticeably different bass responses between the channels.

The cabinets should stand firmly and remain level. Small changes in position can make a worthwhile difference, so alter only one thing at a time and listen before making another adjustment.

Toe-In and Stereo Imaging

Start with the speakers facing forwards or angled gently towards the main listening seat.

Increasing toe-in may sharpen the focus of vocals and central images, while reducing the angle may create a wider and more open soundstage.

Wide Dispersion Technology provides useful flexibility, but both speakers should normally use the same angle and remain symmetrically positioned.

Amplifier Matching

Acoustic Energy specifies a sensitivity of 89dB and a nominal impedance of 6O.

These figures allow the AE109² to work with a broad selection of good-quality integrated and streaming amplifiers.

Its higher sensitivity also makes it easier to achieve useful listening levels than many smaller standmount designs, although amplifier quality and current delivery remain important.

Power handling is rated at 175W. This should not be treated as a required amplifier output, as a lower-powered amplifier can work very well when used within its clean operating range.

Single-Wire Speaker Connections

Each AE109² uses one pair of speaker terminals for a straightforward single-wire connection to the amplifier.

Maintain the same polarity throughout the system by connecting positive to positive and negative to negative.

Switch the amplifier off before connecting or changing speaker cables and ensure that no loose strands can bridge the terminals.

Black or Walnut Finish

The AE109² is available from Audio T in Black or Walnut vinyl veneer.

Both versions are supplied with slim magnetic cloth grilles, allowing the front baffle to remain free from visible fixing points when the grilles are removed.

Clean the cabinets using a soft, dry cloth and avoid abrasive products, solvents and furniture polish.

Adding a Subwoofer

The AE109² provides useful bass extension on its own, but customers wanting the lowest effects from films or greater weight from electronic and organ music can add an active subwoofer.

The Acoustic Energy AE Sub provides adjustable level, crossover and phase controls for integration with a suitable stereo or Home Cinema system.

A subwoofer should extend the speakers naturally rather than making every recording sound noticeably bass-heavy.

Key Features

• Slim passive floorstanding loudspeakers
• Supplied as a pair
• 2.5-way rear-ported design
• Two 130mm doped paper-cone drivers
• High-force, long-throw driver motors
• 25mm soft fabric-dome tweeter
• Neodymium tweeter motor
• Wide Dispersion Technology waveguide
• 275Hz and 2.5kHz crossover frequencies
• Rear slot-shaped reflex port
• Port designed to reduce turbulence and distortion
• 15mm High Density Fibreboard cabinet
• Carefully positioned internal bracing
• 41Hz–26kHz frequency range
• 89dB sensitivity
• 6O nominal impedance
• 175W power handling
• 115dB specified peak sound pressure level
• Slim magnetic cloth grilles
• Available in Black or Walnut

Frequently Asked Questions