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Summary of Contents for Eminent LFT XVI
- Page 1 EMINENT TECHNOLOGY INCORPORATED LFT XVI HYBRID LINEAR FIELD TRANSDUCER LOUDSPEAKER REFERENCE MANUAL Revised: 12/28/05 Eminent Technology, Inc. 225 East Palmer Street Tallahassee, Florida 32301 Phone: (850) 575-5655 FAX: (850) 224-5999 Email: info@eminent-tech.com Website: www.eminent-tech.com...
- Page 2 Strong magnetic fields are present ATTENTION: at and around this loudspeaker. STRONG Devices that are adversely affected MAGNETIC by high levels of magnetic flux, FIELDS such as television sets and _____________ pacemakers, should be kept at least three feet away from each speaker.
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Page 3: Table Of Contents
TABLE OF CONTENTS Installation of the LFT-16 ............5 Unpacking the Speakers ............. 5 Speaker Assembly ..............5 Positioning the Speakers in the Listening Room ....... 5 Imaging ..................6 The Tweeter Level Control ............6 Amplifier Requirements ............. 6 Bi-Wiring and Bi-Amping ............ - Page 4 Warranty ..................24...
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Page 5: Installation Of The Lft-16
Installation of the LFT-16 A complete technical description of the LFT-16 is included in this manual and begins on page 7. It is recommended that you become familiar with this information because an understanding of the LFT principals will assist you in the proper set up of these loudspeakers. The LFT-16 is shipped in one box. -
Page 6: Imaging
position the speakers so that the main listening position is about on axis with each speaker. Slight mid-range frequency balance changes can be obtained by pointing the speakers slightly away from the listening position. Adjusting the speakers’ degree of vertical tilt with the pointed feet can also alter this balance. Imaging Overall imaging depends primarily on the distance separating the two speakers relative to their distance from the preferred listening... -
Page 7: Bi-Wiring And Bi-Amping
Note that you will also need a level control on either one of the stereo amps or on the crossover, regardless of which approach you take to bi-amping. Contact Eminent Technology or refer to the schematic in the back of this manual to... -
Page 8: Technical Description
The Eminent Technology Linear Field Technical Transducer is a full-range, push-pull, dynamic Description 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: Planar Magnetic Loudspeakers
sandwiched between two stationary conductive grids (usually perforated metal plates) called stators. FRAME FRONT STATOR REAR STATOR [PERFORATED METAL PLATE] CONDUCTIVE DIAPHRAM TO BIAS VOLTAGE SUPPLY RESISTOR AMPLIFIER TRANSFORMER PUSH-PULL ELECTROSTATIC [TOP VIEW CROSS-SECTION] Spacing exaggerated to show detail A DC charge of high voltage (in the thousands of volts) but very low current, known as the bias voltage, is applied to the conductive diaphragm and kept constant. -
Page 10: Ribbon Loudspeakers
voice coil of a conventional cone driver). The diaphragm is held taut in a metal frame. On the front of this frame is a large sheet of perforated metal, to which rows of vertically aligned strip magnets have been fastened. FRAME DIAPHRAM VOICE GRID... -
Page 11: Evaluating Earlier Approaches
A ribbon driver is based on a long, narrow strip of conductive material; in practice, thus far, all true ribbons have used a strip of very thin corrugated aluminum for this purpose. The two ends of this strip are electrically connected to the amplifier’s output, and are physically anchored such that the strip is suspended within a stationary magnetic field--with said magnets positioned at the edges of the strip. -
Page 12: Planar Magnetics
To date, no one has succeeded in creating a full range ribbon loudspeaker. Eminent Technology’s Linear Field Transducer, introduced The Linear as the LFT, represents a new approach to the design and... -
Page 13: Diaphragm Construction
It was not until Eminent Technology developed a special method for this assembly procedure that the Linear Field Transducer became a reality. - Page 14 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. The use of a welded channel-and-crossbar frame dispenses with the need for perforated sheet metal (an “off-the-shelf”...
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Page 15: Panel Frequencies
Each LFT-XVI has two individual driver panels and a cone Panel type woofer. The placement of the individual drivers is Frequencies shown in the following diagram. 7.5 KHz and above 250 to 7.5 KHz To 250 Hz General Specifications Power Requirements 25 Watts minimum Sensitivity 85 dB (pink noise, 20 - 20kH) at 1... -
Page 16: Lft-16 Impedance Curves
Maximum SPL 103 dB at 1 meter Dimensions 9.75” wide by 21.5” high by 9.75” thick Shipping Weight 23 lbs. Each Warranty 3 years parts, 1 year labor Available Finishes Oak, Walnut, Black Painted Oak LFT-16 Impedance The LFT-XVI impedance is shown below. The impedance Curves generally averages much higher than 8 ohms. -
Page 17: Lft-16 Impedance Data
LFT-16 Impedance The impedance curves are shown for the woofer and mid-range/tweeter inputs Data connected. With the woofer section in parallel with the mid-range/tweeter section, the impedance curve becomes essentially flat with a minimum of about 5.5 ohms occurring around 100 Hz and a maximum of 30 ohms at 7.5 kHz. The 30 ohm peak is with the tweeter in its low output position. -
Page 18: Frequency Response
The LFT-16 system 10Hz to 30Khz frequency response Frequency with the microphone at 1 meter is shown below. Low frequency Response irregularities are a result of the testing room. Near Field response of the tweeter including the crossover measured from 10Khz to 50Khz. This tweeter should please dogs and cats and is SACD ready. -
Page 19: Lft-16 Mid-Range Panel Specifications
LFT-16 Mid- Range Panel Specifications Magnet Type Ceramic 8 Mid-range Diaphragm area 35 sq in Foil Thickness 0.0007 in Mylar Thickness 0.0005 in Laminate Adhesive Thickness 0.00015 in Gap Between Conductors 0.03 in Peak-to-Peak Diaphragm 0.12 in Displacement Diaphragm weight 1 Gram Free Air Resonance 120 Hz... -
Page 20: Mid-Range Panel Design
Mid-Range Panel Design Do not attempt to disassemble these panels. The steel frame is preventing the panel from collapsing on itself. Removal of the cap screws that hold the panel together will surely cause damage to the diaphragm and may pinch hands and fingers. - Page 21 Box Volume 9.181 Liters 605 in 3 .687 ft 3 Speaker Diameter 6.5 inch Magnet weight 20 oz. Impedance 6 Ohms 6.35 Ohms 0.60 mH 24.5 Hz ±15% 21.8 grams 22.7 Grams...
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Page 22: Additional Woofer Specifications
46.8 Liters 2.77 0.31 0.28 8.47 Tm Xmax 4.25 mm Additional Woofer Pmax 75 Watts Specifications Coil Diameter 1.5 in Gap Height 0.25 in Efficiency 0.22% 133.1 cm 56.6 cm 79.3 1.258 N*sec/m 1.861 mm/N Woofer Design... -
Page 23: Woofer Enclosure
The design goal for the woofer is good transient response, low Q, low cutoff frequency and minimal coloration near the crossover region. In a hybrid system of this type, it is desirable to have as low a crossover frequency as possible for the woofer. Because of these factors we chose to design our on woofer. - Page 24 30 days from the date of purchase. Within that period, any failure of the LFT-XVI will be corrected without charge for parts, labor, or transportation from the factory. After this period, pending receipt of the warranty form (filled out and mailed to Eminent Technology, and...
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Page 25: Warranty Form
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. The LFT-... - Page 26 Address_____________________________________________________ City________________________________________________________ State_______________________ Zip_________________________ Dealer Purchased From_________________________________________ Dealer Address_______________________________________________ City________________________________________________________ State_______________________ Zip_________________________ Date Purchased _______________ Serial Number R________________ L________________ Please complete this form and return to: Eminent Technology 225 East Palmer Street Tallahassee, FL 32301 U. S. A.
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