Eminent LFT-8b Spezifikationen

EMINENT TECHNOLOGY INCORPORATED LFT-8b HYBRID LINEAR FIELD TRANSDUCER LOUDSPEAKER ® REFERENCE MANUAL Revised: 10/30/07 Eminent Technology, Inc

The Eminent Technology Linear Field Transducer is a full-range, push-pull, dynamic planar loudspeaker. In a sense, it is the magnetic equivalent of a

The electrostatic starts with a very thin (half mil or less) diaphragm made of Mylar or a similar material, to which a light coating of mildly conduct

The traditional planar magnetic also starts with a thin Mylar diaphragm, one side of which is coated with adhesive and fitted with an aluminum wire vo

The third and final antecedent to consider is the ribbon: a distinctly different sort of transducer, but one that is similar (in principle, at least)

Not surprisingly, each of the approaches described above has its own unique set of pros and cons. The electrostatic, because its diaphragm is so thin

Also, when a ribbon is operated at frequencies approaching the element’s own resonant frequency (which is naturally quite low, due to its high compl

Eminent Technology’s Linear Field Transducer, introduced as the LFT, represents a new approach to the design and construction of a high-quality loudsp

By applying such new techniques to planar loudspeaker construction, Eminent Technology has been able to eliminate many of the flaws inherent in earlie

Each LFT-8b has two individual driver panels and a cone type woofer. The placement of the individual drivers is shown in the following diagram.10 KHz

General Specifications:Power Requirements 75 Watts minimumSensitivity 84 dB (pink noise, 20 - 20kH) at 1 watt/1 meter (2.83 V)Frequency Response 25 Hz

Extremely strong magnetic fields are present at and around this loudspeaker. Devices that are adversely affected by high levels of magnetic flux, suc

LFT-8b Impedance CurvesThe LFT-8b impedance is shown below. The impedance generally averages much higher than 8 ohms. This means that the speaker do

LFT-8b Impedance DataThe impedance curves shown below are for the woofer and mid-range/tweeter inputs measured individually. The woofer curve shows a

Crossover InformationLFT-8b Crossover SchematicLFT-8b Crossover Physical LayoutTechnical Information22

Square Wave PerformanceThe square wave performance of the LFT-8b is shown below at different frequencies. Measurements were made in a normal listenin

Frequency Response1/3 Octave, One Watt, One MeterTechnical Information24

LFT-8b Panel SpecificationsMagnet Type Ceramic 8Mid-range Diaphragm area 126 sq inFoil Thickness .00033Mylar Thickness .0005Laminate Adhesive Thicknes

Mid-Range Panel DesignDo not attempt to disassemble these panels. The steel frame is preventing the panel from collapsing on itself. Removal of the c

LFT-8b Woofer SpecificationsBox Volume 23 Liters1403 in3.812 ft3Speaker Diameter 8 inchMagnet weight 33 oz.Impedance 8 OhmsDC Resistance 6.79 OhmsIndu

Additional Woofer SpecificationsFC31.73 HzRE6.79 OhmsF123.3F246.2QM12FFrF−oc3.610QE1−omrQ0.623QTE QQQQ+MEM0.531Technical Information28

Woofer DesignThe design goal for the woofer is good transient response, low Q, low cutoff frequency and minimal coloration near the crossover region.F

TABLE OF CONTENTSInstallation of the LFT-8b ...

Woofer EnclosureThe design goal for the woofer enclosure is:(1) To be as resonance free as possible (rigid) to prevent low frequency and mid-range c

Eminent Technology Inc. warrants the LFT Loudspeaker to be free from defects in materials and workmanship for a period of 30 days from the date of pur

EMINENT TECHNOLOGY, INC. LFT-8bWARRANTY FORMName_______________________________________________________Address________________________________________

HEX CAM SPACER INSTALLATION AND ADJUSTMENT FOR THE LFT-8bTools needed:5/32 Allen Wrench7/16 Open End Wrench (aluminum recommended)INSTALLATION1.) Remo

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TWEETER DIAPHRAGM REPLACEMENT FOR THE LFT-8bRevised 10/26/2007Remove the tweeter driver completely from the speaker frame. Disconnect the black tweet

Assembling and Installing The Tweeter DriverRe-assembly of the tweeter driver should be done in the exact reverse order as it was disassembled. Re-i

Woofer Enclosure ...

A complete technical description of the LFT-8b is included in this manual and begins on page 10. It is recommended that you become familiar with this

Assemble the panel to each woofer cabinet as shown below. Fasten the feet to the bottom of the woofer cabinet. Use the drawing below to identify the c

Speaker placement is critical for correct imaging, frequency balance, low frequency performance, and efficiency.The LFT-8b speakers are a mirror image

The high frequency performance of the LFT’s can be tailored with the tweeter level control. The high frequency performance of the LFT-8b is adjusted w

The LFT-8b is configured to allow bi-wiring or bi-amping with a minimum of trouble.Bi-wiring simply means connecting a single stereo amplifier (or two