Legacy Xtreme XD Manuel utilisateur

Owners Manual For The

Xtreme XD

Loudspeaker System

Registration

3. Owners Record

4. The Cabinetry / Our Commitment

Setup

5. Unpacking Your Speakers

6. Speaker Placement / Installation

8. Hook up Cables

10. Speaker Connections

15. Fine Tuning

Technology

18. Designer’s Note

19. Specifications

20. Troubleshooting

The model and serial numbers are located on the rear of the unit. Record

these numbers in the spaces provided below. Refer to them when calling

upon your dealer regarding this product.

Model No. _______________________________

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

enjoyment. Please take a few moments to read this brief manual to insure

maximum benefit from your speaker system.

Handcrafted

Beneath the surface of Xtreme XD’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”.

Your new speaker system has been very carefully packaged to insure

that it travels to you safely. Each speaker is protected by a doublewall

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.

Since the human ear is rather poor at localizing radiation frequencies

below 125 Hz, good results may be obtained in a variety of room

placements. Careful adjustment of the convenient front panel controls will

lead to seamless transition.

Low frequency reinforcement occurs whenever woofers are placed near

room boundaries. The distance from the walls, floor and ceiling

correspond to the wavelengths of the frequencies, which will reflect in

phase and thus reinforce bass output. Therefore, the actual dimensions of

your listening room play a definite role in what ultimately arrives at your

ear. In fact, rooms tend to have their own set of favored frequencies.

We can calculate what the most strongly reinforced frequencies in a room

will be by the formula shown below:

Resonant Frequency = (1130 ft/sec) / (ft. between boundaries x 2)

For example, a room with an 8 ft. ceiling height has a strong resonance at:

(1130 ft/sec.) / (8 ft. x 2) = 71 Hz.

Now, while such reinforcement might actually be beneficial at very low

frequencies, excessive excitation can cause “overhang” or a droning effect

at mid-bass frequencies. A way to minimize excitation of these

resonances is to place your subwoofer asymmetrically relative to room

boundaries. For instance, if the subwoofer is 2 ft from one corner wall,

then place it 1.5 ft to 3 ft from the other.

Placing the subwoofer in a corner will reduce the radiation angle and thus

increase efficiency. It will also excite the maximum number of room modes

and decrease distortion.

A best case scenario is to actually use two subwoofers, one to each side

of the listener. The subs should be placed 90° out of phase with each

other. This improves spaciousness and bass uniformity, with a reduction in

room level peaks.

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 effect is

well out of the audio bandwidth; inductance can be decreased (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.

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 controlling factor of the amplifier/loudspeaker interface.

Excessive resistance can cause major shifts of speaker crossover

frequencies. The lower the impedance of the loudspeaker, 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 one-

half decibel.

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.

Once you’ve found a place in your room, the next step is connecting the

Point One to your existing system. Listed below you will find 5 options.

Option 1: Connecting the Xtreme XD using the LFE input.

If your preamplifier/digital processor/receiver has a subwoofer output, it

can be connected (via RCA cable) directly to the LFE (Low Frequency

Effects) input (fig. 1).The LFE input bypasses the subwoofers internal

crossover and allows you to control your low frequency settings

(Frequency, Level) from your preamp.

NOTE: When using the LFE input, the freq. control on

the front panel of the Xtreme XD will be bypassed. The

level control will then function as a sensitivity control,

allowing the preamp/processor to control volume.

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