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Eminent Technology LFT-8b

Eminent Technology LFT-8b

The Eminent Technology LFT-8b is a hybrid, with push-pull, dynamic planar loudspeaker elements for the midrange and tweeter and a conventional cone loudspeaker for bass. The planar section is in a sense, 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.

The Eminent Technology LFT-8b, ETI's first hybrid loudspeaker using the highly acclaimed Linear Field Planar Magnetic Transducers combined with a low Q 8" woofer in a sealed inclosure.

The magnetic drive principle developed by Eminent Technology for the LFT speaker series is unique to the industry. As the diaphragm of the speaker moves between the magnets following an audio signal, the magnetic field remains constant. 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 the diaphragm.

In order to obtain a uniform driving force over the entire surface area of the diaphragm, a low mass foil/mylar diaphragm is used with conductor traces etched (like a circuit board) with high resolution. The large surface area of the midrange driver gives excellent power handling capacity. A thin lightweight diaphragm is utilized for the high frequency driver.

The LFT-8b minimum recommended amplifier is 50 watts/channel. The maximum recommended power is 200 watts/channel. The speaker is moderately efficient and its impedance averages 8 ohms.

The low frequency woofer was carefully designed to blend seamlessly with the mid-range and high-frequency drivers. The design uses a very low crossover frequency (180Hz) between the woofer and midrange. The woofer has a very high complince and operates with a near critically damped system Q of .58. This tuning insures excellent transient response.

The panels are attached to a rigid steel frame to prevent resonances. The woofer is mounted in a rigidly braced enclosure.

The LFT-8b is biampable and uses the Edison Price Music Post. The standard finish is oak with black grills (shown), optional finishes are available for an additional charge.

Hifi World February 2010 side 1 side 2 side 3 side 4

LFT-8b General Specifications:Power Requirements 75 Watts Minimum

Sensitivity 83 dB (pink noise, 20 - 20kH)
at 1 watt/1 meter (2.83 V)

Frequency Response 25 Hz-50 kHz ±4 dB (typical
room)

Phase Accuracy ± 20deg 100 Hz-31 kHz

High Frequency Level Flat, - 6dB, -12dB at 20kHz
smooth rolloff

Impedance Nominal 8 Ohm Rating

Maximum SPL 105 dB at 1 meter

Dimensions 13" Width by 60" Height by 1" Depth

Shipping Weight 65 lbs. Each

Warranty 3 Years Parts, 1 Year Labor

Finish Oak Standard, Black Painted Oak or Walnut Optional

LFT-8b Panel SpecificationsMagnet Type Ceramic 8

Mid-Range Diaphragm Area 126 sq in

Foil Thickness .00033

Mylar Thickness .0005

Laminate Adhesive Thickness .00015

Gap Between Conductors .03

Peak-to-Peak Diaphram .180
Displacement

Tweeter Diaphragm area 10 sq in

Tweeter Peak to Peak .050
Displacement

LFT-8b Woofer Driver SpecificationsBox Volume 23 Liters
1403 in3
.812 ft3

Speaker Diameter 8 inch

Magnet Weight 1lb. 2oz

Impedance 8 Ohms

DC Resistance 6.65 Ohms

Inductance 2.27 mH

Free Air Resonance 18 Hz ±15%