Outline GTO Line Array

Large Format Touring Line Array

Outline's concept for GTO is to produce a large format line-source loudspeaker system that is flexible, adaptable, easy to use and which provides audio performance that meets the demands of the most discerning engineers, rental companies and production managers. GTO is an acronym for Grand Touring Outline, which describes our concept of a system engineered specifically for large-scale sound reinforcement applications.

In 2002, the Butterfly system was launched which contained a number of unique Outline engineering concepts, and which has brought many new friends and customers around the world. GTO benefits from a process of natural evolution which retains the basic design principles, proven within the Butterfly project, and expands them into a new system which provides greater SPL, more control, improved resolution, faster transient response and unrivalled uniformity in long-distance projection.

One of the essential design elements retained from Butterfly is the V-shaped front baffle, for which Outline was awarded an international design patent in 2002, and to which we refer as the ‘V-Power Concept'. This ground-breaking design allows individual sound sources to be positioned, when coupled in an array, much closer together than in conventional line-source systems. This facilitates superior acoustical coupling between high-frequency modules thus producing a smooth yet extended HF response.

It also creates the ideal ‘unbroken baffle' shape through an array which minimises diffraction and deterioration of the mid-high frequencies, thus contributing to the far-field performance of the system.

Medium Format Touring Line Array

The C.D.H. 483 Hi-Pack is the Butterfly system's element for mid-low, mid and high frequency reproduction. Weighing just 34 kg. The cabinet has an unmistakable shape which brings to mind the butterfly from which it takes its name, thanks to the triangular opening in the upper and lower "sides". This original design solution favours the optimum coupling of array elements up to the highest frequencies, keeping the distance between the sources as short as possible and at the same time providing them with a continuous loading ‘baffle'.

The high frequency section of the Butterfly system is equipped with a 3" (1.41" throat) compression driver coupled with a D.P.R.W.G. (Double Parabolic Reflective Wave Guide) device geometrically based entirely on precise mathematic calculations to take a circular planar (flat) wavefront emitted by the source at its input (e.g. that of a compression driver) and transforming it into a rectangular planar wavefront at its output, keeping signal paths identical from every emission point of the source. The rectangular planar wavefront thus obtained can be loaded by an appropriate horn or waveguide to ensure the necessary coverage.

Four high-efficiency 8" mid woofers: two band-pass loaded (110 - 400Hz) and two reflex high-pass (110 -1250Hz) loaded by the sides of a waveguide with a 90° dispersion angle are connected in parallel without any type of passive crossover, so can both be powered using one amplifier.

Medium Format Touring Line Array

MANTAS is one of the most recent VLA element designed by Outline. Thanks to the great experience accumulated with Butterfly - the Outline system with the same fundamental components and characteristics - MANTAS offers leading edge performance from a cabinet that is extraordinarily compact and light-weight.

Its top grade components - two 8-inch mid-woofers with Neodymium magnets and a 3-inch compression driver loaded with the well known D.P.R.W.G. - ensure absolutely insignificant distortion levels and greater reliability. MANTAS is a reference point in its category (compact VLA) for medium-sized applications, but it was not only conceived as an object in its own right: it has the great advantage of being compatible with Butterfly. In fact, it has the same flying points and can be used along with the Butterfly system (flown below it) as an element able to give wider horizontal coverage (120°) for FRONT-FILL and DOWN-FILL applications.

Numerous rental companies worldwide benefit from the "Butterfly-Mantas" combination to ensure even sound distribution for their audiences, no matter how large they are. The HF section is entrusted to a compression driver with a 3" diaphragm loaded with a D.P.R.W.G., already used successfully on the Butterfly system. MANTAS weighs just 24 kilograms (52.9 pounds) and measures 24 x 75.2 x 52.1 cm (9.4 x 29.6 x 20.5 inches), i.e. the same footprint as a Butterfly system (including hardware). MANTAS is used in biamp format. The channels of the amplifiers will power the 8-inch mid woofer (LF-MF section) and the 3-inch compression driver (HF section) separately. MANTAS clearly has a good COST-EFFICIENCY RATIO. With just four amplifiers, twelve elements (6+6 in stereo) can be correctly powered: this type of set-up ensures exciting SPL for a large audience.


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