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A complete technical description of the LFT-6 is included in this
manual and begins on page 8. It is recommended that you become
familiar with this information as a thorough understanding of the
LFT principals will assist you in the proper set up of these
loudspeakers.
Position the box on its side and open the end of the shipping carton.
Remove the padding from the bottom and slide the speaker from the box as
shown below.
After removing the speaker from its carton it can be leaned against a wall
standing up or placed with the front face of the speaker flat on the carpet.
Then the bubble wrap should be removed. The wrap also holds the baffles
(black triangular boards) and the grill cloth (covered by a large cardboard
sheet) to the speaker. After the wrap is removed these will separate from
the speaker.
Do not attempt to remove or loosen hardware on the drivers
themselves. The magnents are held together under great force and
personal injury could result.
Open
1
Installation of
the LFT - 6
Unpacking the
Speakers
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Summary of Contents for Eminent LFT-6
- Page 1 A complete technical description of the LFT-6 is included in this manual and begins on page 8. It is recommended that you become Installation of familiar with this information as a thorough understanding of the the LFT - 6 LFT principals will assist you in the proper set up of these loudspeakers.
- Page 2 Speaker Assembly Assemble the feet and baffles with the speaker lying front face down on the carpet. Use the drawing below to identify the correct hardware locations. Grill cloths snap into place with velcro fasteners at each corner on the front and back of the speaker.
- Page 3 Positioning the Speaker placement is critical for correct imaging, frequency balance, Speakers in the low frequency performance, and efficiency. listening room Low frequency performance in particular can be determined by the shape of the room and the speaker's distance from the wall immediately behind them.
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Page 4: The Listening Room
Overall Balance The overall frequency balance of the LFT-6 is somewhat affected by the and Toe-In degree to which the speakers are toed in toward the central listening position. The on-axis frequency response of the LFTs is essentially flat, and it is often best to position the speakers so that the main listening position is about on axis with each speaker. - Page 5 The high frequency performance of the LFTs can be tailored with the The Tweeter Level tweeter lever control. A jumper is mounted under the crossover cover. Control There are three tweeter level positions. If the jumper is disconnected, the treble energy is rolled off slightly and this is the lowest setting. When the jumper is connected to the third terminal up from the bottom of the right hand row of six terminal points, the tweeter output at its middle position.
- Page 6 Bi-Wiring and Bi- The LFT-6is configured to allow bi-wiring or bi-amping with a minimum of Amping trouble. The two pairs of inputs on the crossover are connected together internally, hot to hot and ground to ground. During normal use, speaker cables can be connected to either the top or bottom pair of inputs.
- Page 7 Bi-amping requires and additional stereo amplifier or pair of mono amps. Bi-Amping You will also need some means of insuring that only the desired portion of the frequency range reaches each amplifier. The simplest way to accomplish this is with an external electronic crossover; however, this can also be done by hard-wiring low-pass and high-pass filters into the inputs of the bass/mid and treble amplifiers, respectively.
- Page 8 Technical The Eminent Technology Linear Field Transducer is a Description full-range, push-pull, dynamic planar loudspeaker. In a sense, it is the magnetic equivalent of a push-pull electrostatic loudspeaker, differing in that it requires no step-up transformer or bias voltage, and that the audio signal is applied directly to its diaphragm.
- Page 9 antecedents: the push-pull electrostatic loudspeaker (ESL); the traditional, single-ended planar magnetic loudspeaker, and the ribbon loudspeaker.
- Page 10 Electrostatic The electrostatic starts with a very thin (half mil or less) diaphragm made Loudspeakers of mylar or a similar material, to which a light coating of mildly conductive substance such as graphite has been applied. This diaphragm is suspended on a rigid frame and sandwiched between two stationary conductive grids (usually perforated metal plates) called stators.
- Page 11 The traditional planar magnetic also starts with a thin mylar diaphragm, one Planar Magnetic side of which is coated with adhesive and fitted with an aluminum wire Loudspeakers voice grid, (analogous to the voice coil of a conventional cone driver). The diaphragm is held taut in a metal frame.
- Page 12 Ribbon The third and final antecedent to consider is the ribbon: a distinctly Loudspeakers different sort of transducer, but one that is similar (in principle, at least) to the single-ended planar magnetic. The ribbon’s primary distinction is that its “diaphragm” and “voice element” are one and the same. A ribbon driver is based on a long, narrow strip of conductive material;...
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Page 13: Planar Magnetics
Not surprisingly, each of the approaches described above has its own Evaluating unique set of pros and cons. The electrostatic, because its diaphragm is so Earlier thin and light, offers exceptionally good transient response and Approaches reproduction of subtle, low-level musical detail. And, because it is a true Electrostatics push-pull device (i.e., its diaphragm is, by design, driven from both the front and the rear), the ESL operates in a linear fashion. - Page 14 Also, when a ribbon is operated at frequencies approaching the element’s own resonant frequency (which is naturally quite low, due to its high compliance), the ribbon element stretches and “bows” to a point where it is no longer within the magnetic gap. To get around either of these problems means to move the permanent magnet structure from the edges of the element to one entire side of the element, and/or to bond the element to a “host”...
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Page 15: The Linear Field Transducer
It was not until Eminent Technology developed a special method for this assembly procedure that the Linear Field Transducer became a reality. - Page 16 By applying such new techniques to planar loudspeaker construction, Eminent Technology has been able to eliminate many of the flaws inherent in earlier designs. The use of a welded channel-and-crossbar frame dispenses with the need for perforated sheet metal (an “off-the-shelf”...
- Page 17 Each LFT has five individual driver panels. The outside portion on each Panel Frequencies panel is divided into separately driven bass and (line-source) midrange areas, with the former operating from 400 Hz down, and the latter operating from 400 Hz up to 10 kHz. The tweeters operate as a line source from 10 kHz up to and beyond 20 kHz.
- Page 18 surface area of the panels and the resulting good heat dissipation (a function also of the material choice for the voice grid), the LFT-6 can handle tremendous amounts of power before any risk of damage.
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Page 19: Specifications
Specifications Power Requirements: 100 watts minimum Sensitivity 83 dB (pink noise, 20-20 kHz) at 1 watt/1 meter (2.83 V) Frequency Response 38 Hz-20 kHz ±4 dB (typical room, close-mic measurement) -10 dB at 35 kHz Phase Accuracy ± 20° 100 Hz-31 kHz High Frequency Level Flat, -6 dB, -12 dB at 20 kHz smooth rolloff... - Page 20 David Collie and Bruce Thigpen Designers...
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Page 21: Technical Information
Technical information... - Page 22 Technical information...
- Page 23 Technical information...
- Page 24 Technical information...
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Page 25: Warranty
Under the terms of this warranty, Eminent Technology expressly does not insure for loss of use of the LFT due to failure or periods of repair. Warranty repairs will be carried out by the factory.
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