Specifications

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The LFT-11 Planar Magnetic Multimedia Reference Loudspeaker

Congratulations on purchasing the Eminent Technology LFT-11. The LFT-11 is the

most advanced loudspeaker technology available for computer multimedia. With proper

care and use, the LFT-11 should last many years. To get the most out of the LFT-11,

please read the manual carefully. Do not forget to fill out the warranty form in the back of

the manual so we can register your purchase.

UNPACKING

The shipping box should contain a Manual (This document), Woofer Cabinet,

Amplifier, Two Planar Desktop Speakers, Monitor Stand, and Connecting Cables.

Remove all of the components. Be careful with the speakers in the woofer cabinet making

sure that you do not push inward on the speaker cones through the cloth covering as

damage could result.

SETTING UP THE LFT-11

The woofer cabinet is designed to be positioned underneath or beside a desk.

Ideally it should be positioned on the floor underneath the monitor firing in the direction

of the listener however this is not critical to achieve the best performance.

A stand is supplied to provide a location for the amplifier directly underneath the

monitor. In some installations, this may not be practical, however we found that it is a

user-friendly location allowing quick access to the volume and tone controls. In any case,

be sure and position the amplifier where nothing is directly on top of it preventing heat

from escaping.

Summary of content (12 pages)

PAGE 1
The LFT-11 Planar Magnetic Multimedia Reference Loudspeaker Congratulations on purchasing the Eminent Technology LFT-11. The LFT-11 is the most advanced loudspeaker technology available for computer multimedia. With proper care and use, the LFT-11 should last many years. To get the most out of the LFT-11, please read the manual carefully. Do not forget to fill out the warranty form in the back of the manual so we can register your purchase.
PAGE 2
The Planar Desktop Speakers are designed to be positioned on either side of the monitor. They could be placed anywhere around the monitor. Generally they should be at least three inches from the wall behind them for best sound quality. This is the only limitation. We recommend placing them on the desktop so that they can aim directly at the listener’s ears.
PAGE 3
Left Desktop Speaker Amplifier Input Eminent Technology Incorporated Right Desktop Speaker LFT 225 East Palmer Street Tallahassee,FL 32301 R LINEAR FIELD TRANSDUCER MODEL NO. LFT-11 SERIAL NO. Made in the United States U.S.
PAGE 4
GETTING THE BEST PERFORMANCE FROM THE LFT-11 The LFT-11 is designed to be an accurate transducer. As a result it will reveal many limitations in the playback medium and recordings. Differences in sound quality between different sources such as AM or FM radio, the compact disc, or different digital recording schemes and sampling methods will be readily apparent. The LFT-11 is designed to have flat on axis frequency response.
PAGE 5
Most Computer systems are installed in areas where the wall behind the speakers is acoustically reflective. To get the best tonal balance from the LFT-11 we would suggest experimenting with placing some sound absorbing material on the wall behind the desktop speakers and monitor. Open cell foam and carpet are good choices as sound absorbers. WOOFER POSITIONING The frequency balance of the LFT-11 was designed to have essentially flat response in the average computer desktop installation.
PAGE 6
AMPLIFIER Any audio amplifier can be used with the LFT-11. The minimum recommended amplifier power rating is 10 watts RMS per channel. We do not believe any built in amplifier that is included on an internal sound card has sufficient amplifier power to drive the LFT-11 to useable levels directly without the use of an external amplifier. The Radio Shack Optimus STA-300 amplifier included with the LFT -11 is rated at 15 watts RMS per channel and will drive the LFT-11 to suitable levels for most situations.
PAGE 7
DIAPHRAGM CONSTRUCTION The construction of the LFT-11 begins by laminating a very thin sheet of aluminum foil to a half-mil-thick sheet of Mylar. A voice grid pattern, created by means of CAD (Computer-Aided Design) technology, is silk-screened onto the foil side; the remainder of the aluminum--the part not covered by ink from silk-screening is chemically etched away, in a manner similar to the etching of traces on a printed-circuit board.
PAGE 8
design challenge is making a planar speaker both small enough and efficient enough for use in computer multimedia. By applying such new techniques to planar loudspeaker construction, Eminent Technology has been able to eliminate many of the flaws inherent in earlier designs Cloth is used on the backside of the speaker to resistively load the diaphragm. This lowers the Q of the diaphragms free air resonance.
PAGE 9
Since it is now possible to have a powerful, precisely aligned magnet structure on both sides of the diaphragm, true push-pull operation has been achieved: Regardless of the degree of excursion the diaphragm undergoes, the voice element is always optimally positioned within the magnetic field. The result is extremely linear performance throughout the audible range, with a profound increase in dynamic range and and absolute minimum of distortion.
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C1= 220 uF C2= 3.3 + uF C3= 330 uF L1= .55mH L2= 5.5mH L3= 1.5mH R1= 8 ohms Woofer resistance = 8 LFT panel resistance = 5.6 L1 C1 + + C2 R1 _ _ C1 R1 L1 L3 L2 C3 Note: If additional low frequency output is desired for your application an additional 10 watt-8 ohm resistor can be placed in parallel with R1. This resistor is located on the back of the woofer. Contact the factory for the resistor or if you have any questions regarding this.
PAGE 12
Eminent Technology Warranty Form LFT-11 Name Address State City Zip Home Phone Number Dealer Purchased From Dealer Address City State Zip Date Purchased Serial Numbers (L) Please complete this form and return to : Eminent Technology Inc. P.O.