L-ACOUSTICS^® introduced the first coaxial loudspeaker for sound reinforcement, in 1989. Initially designed for multipurpose applications, the coaxial technology has demonstrated numerous advantages over classic two-way systems which typically suffer from interference around the crossover point resulting in lobing and uneven frequency and power response.

By superimposing HF and LF acoustic centers in a coaxial design, a virtual point source brings significantly improved radiation characteristics. This is particularly valuable in distributed sound reinforcement applications where most listeners are located off the system axis. As the sound field of coaxial enclosures is stable over the entire frequency spectrum and in all directions, all listeners benefit from an even sonic performance within the enclosure beamwidth.

The particular benefits of coaxial technology are related to the radiation characteristics of a point source. The natural studio monitor sound quality and the aural sensation of transparent sound typical of coaxial systems is adapted to proximity applications such as stage monitoring, front-fills, under-balcony fills and FOH live monitoring.

The point source technology is also suited to distributed applications in semi-reverberant spaces where a single reflected source offers a more coherent radiation field with less reflected virtual sources than a dual acoustic source typical of horn-woofer combinations.

All coaxial systems are available as plug and play solutions with built-in amplification and DSP (P series) or amplified controllers available with a complete set of dedicated preset libraries for FOH, fill and monitor modes. This integrated package offers the user a fast and easy set-up and
ensures performance consistency, predictability and the best possible component protection.

The 8XT cabinet is the most compact model of the L-ACOUSTICS® XT coaxial series and operates on a frequency bandwidth of 65 Hz to 20 kHz. This response can be lowered to 32 Hz with the addition of the SB18 subwoofer.

The 8XT enclosure contains a 1.5’’ diaphragm compression driver coaxially-loaded by an 8’’ low frequency transducer mounted in a bass-reflex tuned enclosure. The internal passive crossover network uses proprietary third order filters. The linearization and protection of the transducers is defined by the drive parameters contained in the amplified controllers.

The coaxial transducer arrangement produces a 100° axi-symmetric directivity output along with a smooth tonal response free of secondary lobes over the entire frequency range.

Made of high-grade Baltic birch plywood, the cabinet design makes the 8XT perfectly suited to all multi-purpose sound reinforcement applications. Its wedge-shape allows short or long throw monitoring use with two fixed angle settings of 30˚ and 40° from vertical. The 8XT can also be pole-mounted using the integrated socket or flown using the complementary ETR8-2 bracket or a 3rd party Omnimount® fixture.

The 8XT is driven by the L-ACOUSTICS® amplified controllers in the following modes:

• ‘‘FULL RANGE’’ mode for standalone use of 8XT at nominal bandwidth ([8XT_FR], [8XT_FI] and [8XT_MO] presets)
• ‘‘HIGH-PASS’’ mode with 100 Hz high-pass filter to possibly associate the complementary SB18 subwoofer ([8XT_FR_100], [8XT_FI_100] and [8XT_MO_100] presets)

For each mode a distinction is drawn between [FRONT], [FILL] and [MONITOR] presets as they respectively match front of house, distributed applications and half-space loading operating conditions.

The performances of the 8XT enclosure depends upon the choice of preset and physical system configuration.

• 65 Hz - 20 kHz ([8XT_FR] preset)

• 100° Axi-symmetric

• 127 dB ([8XT_FI] preset)

• 280 W ([8XT_FI] preset)

• LF: 1 x 8’’ weather-resistant transducer
• HF: 1 x 1.5’’ diaphragm compression driver
• Nominal impedance: 8 ohms

• H x W x D: 422 x 250 x 271 mm - 16.6 x 9.8 x 10.7 in.
• Wedge angle: 30° ou 40° from vertical
• Weight (net): 11 kg - 24.3 lbs.
• Connectors: 2 x 4-point Speakon®
• Material: 15 and 18 mm Baltic birch plywood
• Finish: Grey-brown RAL 8019®
• Front: polyester powder-coated steel grill, Airnet® acoustically neutral fabric
• Rigging: integrated handles and pole mount socket, Omnimount® compatibility, and optional ETR8-2 bracket

BARACK OBAMA's Speech (2009)
USA

• Audience: 3 000
• 2 8XT front-fill
• 2 8XT stage monitors