Specifications

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.

The mid-range panel design (shape and size) was chosen for good dispersion

and bandwidth.

For a given speaker design, there is a direct trade off between maximum sound

pressure level, bandwidth and efficiency. In the LFT-16, the mid-range panel

is usable from 100 Hz to about 40 kHz. However, there are problems if you

use the panel over its full frequency range.

At the upper frequency limit, the panel will beam because the wavelength

becomes much shorter than the panel is wide. This is also the reason the

speaker sounds best within the vertical axis of the mid-range panel.

At the lower limit, the panels free air resonance is 120 Hz. This resonance is

damped almost 100% with cloth on the back magnet channel assembly.

Around 120 Hz at high sound pressure levels, the excursion limit of the

diaphragm will be exceeded and it will slap against the magnet channel. A

crossover point of 180 Hz is chosen to achieve a good maximum sound

pressure level and still have the mid-range panel play vocal fundamentals and

mid bass which is desirable for a good blend with the woofer. Since the lower

crossover frequency is 6 dB per octave, the panel still has substantial output

below 100 Hz.

Near field response of the woofer 10Hz to 2Khz including the

crossover network. The near field measurement removes most of

the low frequency room modes.

Mid-Range

Panel

Design

LFT-16

Woofer

Specifications