Floorstanding loudspeakers — Acoustic Energy AE520

The AE520 is the largest model in the 500 Series from the British company Acoustic Energy, a slim three-way floorstander that builds on the smaller AE500 and AE509. All six of its drivers, from the tweeter to the woofers, use carbon fibre, a material the company developed to match the pistonic behaviour of the ceramic-aluminium cones used in its earlier speakers while adding more internal damping.

Key specs that matter

The driver complement comprises one 25 mm carbon fibre dome tweeter, two 125 mm carbon fibre midrange units and three 125 mm carbon fibre woofers, with crossover points at 373 Hz and 2.8 kHz. The frequency range is 30 Hz to 28 kHz (+/-6 dB), sensitivity is 90 dB and nominal impedance is 6 ohms. Power handling is rated at 300 W, and peak output reaches 113 dB SPL. Without spikes the cabinet measures 1130 x 185 x 320 mm (H x W x D), and each speaker weighs 30 kg.

Engineering and use context

The tweeter sits in a cast aluminium WDT waveguide positioned close to the midrange drivers. Its stiffness keeps vibration away from the dome, and its profile shapes dispersion to match the cones through the crossover region. The two midrange units flank the tweeter vertically and occupy their own sealed internal enclosure, isolated from the pressure generated by the three woofers underneath. Their 35 mm voice coils are oversized for a cone of this diameter, which lowers thermal compression and increases motor force. A large rectangular port on the rear provides reflex loading for the woofers, and according to the company the three together match the output of a single 250 mm driver while the baffle stays narrow. Vertical directivity is controlled to limit reflections from the floor and ceiling. The crossover has fourteen elements, including polypropylene film capacitors plus coils wound without a core, and its low-frequency section is built on a separate circuit board to cut crosstalk. Internal wiring is oxygen-free multi-strand copper. The 18 mm Resonance Suppression Composite cabinet borrows its constrained-layer construction from the Reference Series, and solid aluminium outrigger bars carry the spikes. Buyers can choose real American walnut veneer, gloss white or gloss black.

Pairing

The AE520 can be driven by moderately powerful integrated amplifiers, and its power handling also accepts large solid-state amplifiers in rooms of 25 to 45 m2.

Alternatives

Acoustic Energy's AE509 is the smaller two-way tower of the 500 Series, with its drivers in an MTM layout.