Legacy Helix Manuel utilisateur

Registration3. Uncrating

4. The Cabinetry / Our Commitment

Introduction5. Designer’s Note

Setup 6. Speaker Placement

7. Speaker Connections

10. Processor Setup

Technology 12. Specifications

UncratingHelix

Helixisalargeloudspeakerrequiringassis-

tanceofadolley,acordlessPhilipsscrew

driverandtwoormorephysicallycapable

individualstouncrateandlocate.

Herearesomeuncratingtips:

1.Carefullyremovescrewssecuringthelidof

thecrate,andliftpanelaway.Locatesub-

wooferpowercordandsetaside.

2.Nextremovefrontpanelofcrateandset

aside.

3.Removesidepanelofcrateasshown.

4.Removefoamfromtoplidanduseasramp

asshowninbottomphoto.

5.Helixissettingonfourheavydutycasters,

allowingistobemaneuveredonlevel

ground.

6.Takecaretoavoiddamagingfloorswhen

locating.

7.Helixisafieldse7.Helixisafieldserviceableloudspeaker,soit

isunlikelythatanentirecabinetwouldever

needtobereturnedtothefactory.However,

whenmovingorstoring,thecratesare

extremelyusefulforprotectingthecabinets.

Handcrafted

Beneath the surface of Helix’s elegant exterior lies rigid

MDF construction. Interlocking joinery maximizes the

strength of the cabinet parts. Polyester fiberfill is

selected for internal damping. A sharp rap on the

enclosure will leave you with little more than bruised

knuckles.

Each cabinet is impeccably finished on all exposed

surfaces with select veneers. The exquisite finish is

hand-rubbed several times to assure a patina at home

with the most elegant decor.

Our Commitment

A great deal of forethought, love and satisfaction is

instilled in each piece of Legacy workmanship. We take

pride in getting to know many of our customers on a first

name basis.

The renowned “Legacy Satisfaction Guarantee” backs

your purchase of this product.

The HELIX system employs digital signal processing (DSP) to sculpt a unified acoustic wave-

launch into an optimal radiation pattern. The benefits are outlined below.

 HELIX preserves clarity by avoiding early room reflections via controlled directivity.

 HELIX is time synchronized by launch sequencing and phase and group delay

adjustment.

 HELIX broadens the listening “sweet spot” by maintaining channel correlation over

longer distances.

 HELIX delivers greater than 120 dB of clean output full spectrum.

 HELIX eliminates energy robbing passive filters from the signal path.

 HELIX reduces electronically induced distortion by dividing the amplification loads

into multiple bands.

The HELIX project represents seven years of research led by Legacy Audio’s chief

designer, Bill Dudleston. A study of room acoustic interactions with loudspeaker radiation has

been conducted. Investigations of the detrimental effects of these interactions on image

localization, tonal balance and transient response have led to the development of a highly

controlled radiation pattern. With assistance from component manufacturers from France, Italy

and the United States, Legacy has also developed a new family of drivers for the HELIX

system.

HELIX is a reference monitor system. It will deliver more than 120 dB over the full audible

spectrum owing to the application of Neodymium magnets in the woofer and high frequency

motors. The foundation of each HELIX monitor is a 15” subwoofer with a copper anodized,

aluminum diaphragm driven by a 750-watt internal amplifier.

Symmetrically arrayed midbass and midrange drivers provide a carefully shaped directivity

pattern that virtually eliminates sidewall and early floor reflections. Dual 1” tweeters are

splayed precisely to complement this radiation pattern. Each tweeter takes advantage of dual

pole neodymium magnets. A special lens was designed to provide acoustical impedance to the

diaphragms and prevent comb filtering.

The brain of HELIX is a 24 bit digital processing unit. Featuring balanced XLR inputs and

outputs, the processing unit provides to each stereo channel four bands of phase coherent

Linkwitz-Riley filters, room contour, and time arrival adjustment. Implementing an internal 56-

bit accumulator, the processor allows room adjustments to be readily implemented by the

dealer via a serial port. The HELIX PROCESSOR also features a two level security lockout

feature to protect factory and dealer settings.

1. A speaker setup (left) that works well with HELIX follows

these ratios:

Distance, d1, between the speakers (center to center) =

Distance, d2, from plane of speaker front to listener.

2. Toe the speakers into the listening area. In most

circumstances crossing speaker axes just slightly behind of

the listener’s head works best. This will broaden your sweet

spot horizontally. If dispersing into an L-shaped seating

arrangement you might find the best results by aiming the

left speaker at the right most seating position, and the right

speaker at the left most seating position.

Room reflections and resonance typically contribute 85% of

the total energy arriving at the listener’s ears. Often, a

loudspeaker designed to measure well under laboratory

conditions, will become blurred, dissonant and placement

dependent in the actual listening room.

The HELIX speaker has a carefully shaped polar pattern.

This assures that the wave-launch generated will sum

coherently at the listening position. To the left is an

illustration of how our new Helix speaker performs.

Conventional speakers (top) beam treble and scatter

midrange about the imaging room, while loading up the

corners with booming, lingering bass.

Legacy’s directivity controlled designs focus the radiation

pattern toward the listeners (bottom). The result is a broader

sweet spot for imaging, markedly greater clarity and a

slamming bass line that is quick and tight

The Terminal Plate

The four-way HELIX requires the user to provide three channels of amplification per speaker.

This may be accomplished via three stereo amplifiers, a combination of mono blocks and

stereo amplifiers, or a single six-channel amplifier.

HELIX includes an internal 750-watt amplifier to power the subwoofer section. A balanced XLR

input feeds the subwoofer, while three pairs of premium WBT Platinum five-way binding posts

are provided for the mid bass, midrange and treble inputs.

Your Legacy dealer can assist you with your specific cabling needs.

It is advantageous, when practical, to position the amplifiers midway between the HELIX

speakers. This will keep the speaker cable lengths to a minimum

HELIX Internal Wiring (For use by qualified technicians only)

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