Legacy FOCUS SE Manuel utilisateur

Owners Manual For The

FOCUS SE

Loudspeaker System

Registration

Owners Record 3

The Cabinetry Our Commitment 4

Setup

Unpacking Your Speakers 5

Speaker Installation 6

Hooking Up Cables 7-8

Amplification 9-11

Foot Installation 12-15

Speaker Connections 16-20

Fine Tuning 21

Technology

Specifications 22

Table of Contents

Page

The serial number is located on the rear of the unit. Record this

number in the space provided below. Refer to this when calling your

dealer regarding this product.

Model: FOCUS SE

Serial No: _________________________

Date of purchase: ___________________

Thank you for selecting a Legacy Loudspeaker System. These hand-

crafted instruments will provide you with many years of listening en-

joyment.

Owners Record

Handcrafted

Beneath the surface of FOCUS SE’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.

Your purchase of this product is backed by the renowned “Legacy

Satisfaction Guarantee”.

The Cabinetry / Our Commitment

Your new speaker system has been very carefully packaged to insure

that it travels to you safely. Each speaker is protected by a double-

wall outer carton with heavy V-board corner protectors. Molded foam

end caps are used to protect the elegant cabinetry, and a plastic liner

is provided as waterproofing. Please save this packing for future

transportation. If cartons become damaged or misplaced, new ones

can be purchased from Legacy Audio.

Unpackin Your Speakers

To allow more flexibility in seating arrangements, your Legacy loudspeaker is

designed for broad lateral coverage. Optimal listener position is actually

about 5 to 15 degrees off the axis normal to the loudspeaker baffle. Assum-

ing a listener distance of about ten feet, begin by placing the speakers ap-

proximately 7 feet apart and about 1 – 3 feet from the wall behind them. In

most rooms this will afford a speaker position at least 2 feet or more from

the side walls. The amount of recommended "toe-in" is a function of the lis-

tening angle. As the overall listening angle increases from 40 degrees, the

amount of toe-in should increase. Your Legacy speaker is optimized for a flat

response in the far field. Best results are obtained vertically with the lis-

tener's ear at tweeter level with the loudspeakers gently toed in toward the

listener. Increasing the degree of toe-in is recommended when placement

next to sidewalls is required. Placing the loudspeaker or the listener near a

room boundary will generally increase low frequency impact. If you are

forced to position one or both of your loudspeakers in a corner, be prepared

to reduce bass output via the control switches on the rear terminal plate of

each loudspeaker. You may also wish to reduce low frequency output with

your preamp's bass tone control.

Speaker Placement

The ideal conductor would have negligible resistance, inductance

and capacitance. The table below shows how a few actual speaker

cables measure up.

Cable Ωs ft pF ft µH ft

12 ga. 0.0033 24 0.21

14 ga. 0.0048 17 0.13

16 ga. 0.0079 16 0.18

18 ga. 0.0128 28 0.21

Capacitance is considered insignificant in each cable because its ef-

fect is well out of the audio bandwidth; inductance can be de-

creased (at the expense of increased capacitance) by keeping the

conductor pair closely spaced.

How long would a cable have to be before inductance effects would

impinge on the audio spectrum? Approximately 300 feet of 12 gauge

would be required to establish a corner frequency of 20 kHz with an

8 Ohm loudspeaker. As you see, inductance is not a problem for

most of us.

Hookin Up Cables

What about phase shift due to frequency dependent travel times down the speaker

cable? Measurements show that 100 Hz waves will be delayed about 20 billionths of a

second behind 10 kHz waves when traveling to the end of a 10 foot speaker cable.

Since the cilia of the ear requires 25,000 times longer than this just to transmit phase

information, phase shifting is obviously not the primary concern when considering

speaker cables.

What about resistance? Finally we are getting somewhere. Resistance is the control-

ling factor of the amplifier loudspeaker interface. Excessive resistance can cause ma-

jor shifts of speaker crossover frequencies. The lower the impedance of the loud-

speaker, the greater the effects of series resistance. A 20 foot run of 18 gauge cable

can cause up to 10% deviations of crossover center frequencies. That same 20 feet

can un-damp your damping factor and reduce your systems’ output by onehalf deci-

bel.

In summary, there are no perfect cables. The best way to approximate the ideal

would be to keep loudspeaker leads as short as is practical.

Hookin Up Cables

Ideally the loudspeaker would be among the first components selected when assembling a play-

back system. This would allow the user to choose an amplifier capable of delivering adequate

amounts of current into the frequency dependent load presented by the loudspeaker. However,

when upgrading a system, audiophiles may find themselves matching their new loudspeakers to

their existing amplification. For this reason, extensive measures have been taken to ensure that

each Legacy speaker system represents a smooth, non-reactive load to virtually any amplifier.

Often there is much confusion regarding amplification and loudness levels. It should be under-

stood that the role of the amplifier goes beyond that of driving loudspeakers to a given sound

pressure level. The amplifier should be able to CONTROL the loudspeakers across the entire mu-

sic spectrum. This means that parameters such as damping factor (values greater than 60 are

acceptable) and dynamic headroom should not be overlooked when comparing amplifiers.

Amplification

How much power will your new speakers need? That ultimately depends on

your listening environment and musical tastes. As little as five watts per

channel should drive them to a level satisfactory for background music. A

typical 45 watt per channel receiver may fill a room with the compressed

mid-band energy of “heavy metal,” but seem to lack weight or control with

classical recordings. Some audiophiles feel that 200 watts per channel is the

bare minimum to avoid audible clipping distortion when reproducing music

at “live” playback levels. Your Legacy speakers are designed to take advan-

tage of “high-powered” amplifiers, so don’t be afraid to put them through

their paces.

How much is too much power? Rarely is a drive unit damaged by large

doses of music power. More often than not the villain is amplifier clipping

distortion. Even through decades of refinement, loudspeakers are still noto-

riously inefficient transducers, requiring huge amounts of power to recreate

the impact of the live performance. Typically less that 1% of electrical

power is converted into acoustic output. (For example, an omnidirectional

transducer with an anechoic sensitivity of 90 dB @ 1w 1m has a full space

efficiency of only 0.63%)

Amplification

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