Legacy Audio Focus 20/20 Owners Manual

Registration
3. Owners Record
4. The Cabinetry / Our Commitment
Setup
5. Unpacking Your Speakers
9. Hook up Cables
12. Amplification
16. Speaker Connections
17. Fine-tuning
Technology
18. Designer’s Note
22. Specifications
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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 hand­crafted 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.
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Handcrafted
Beneath the surface of FOCUS’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”
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Your new speaker system has been very carefully packaged to insure that it travels to you safely. Each speaker is protected by a heavy outer carton with 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.
With an assistant, unbox the focus speaker by standing the box upright. Pry open the side panel and work the speaker out of the box sideways. Next slide the foam cap and collar over the top end of the speaker. Finally, lift the speaker out of the end cap and remove the protective bag.
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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. Assuming a listener distance of about ten feet, begin by placing the speakers approximately 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 listening 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 listener'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.
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The ideal conductor would have negligible resistance, inductance and capacitance. The table below shows how a few actual speaker cables measure up.
Cable s/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.
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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 one­half 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.
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