ESS amt1

Commentary

A floor-type speaker system equipped with a unique unit called the Hail driver.
Amt stands for "Air Motion Transformer".

The Hail driver is an electrokinetic type, based on the principle of "reproducing sound by compressing and radiating air" and was developed by Dr. Oscar Hail at the Hail Science Institute in the US.
This unit consists of an element placed in a magnetic field composed of a ferrite magnet of approximately 5.5 kg and a laminated pole piece. This element is composed of a polymer film with optimum damping characteristics and accordion pleats that can expand and contract freely.
Each of the pleats has a conductive band embedded in it. When a signal current flows, the opposite pleats pull together to compress and radiate air. The adjacent pleats spread out in reverse and inhale air from the opposite side. This movement is one half cycle, and the other half cycle works in reverse.
These pleats have 17 folds and an area of approximately 230 mm.²As a result, it has a higher efficiency than a horn speaker.
This structure gives the Hail driver excellent characteristics. In addition, the front and rear surfaces are completely symmetrical, and sound is diffused by the wide-angle pole piece, realizing wide directivity close to non-directional.
In addition, the element section has a structure made of a low-mass polymer film (0.012 mm), which realizes an extremely fast start-up time of 20 μ s at 5 khz.

A 25 cm cone type woofer is used for the low range.
It is designed with special emphasis on damping characteristics and low distortion factor so that it can respond to the characteristics of Hail drivers.

Equipped with a 3-stage switching attenuator to match the acoustic characteristics of the room.
Frequencies above 600 Hz can be switched to Bright, Normal or Soft in 2 dB steps.

The built-in fuse protects the speakers even if an unexpected abnormal input is applied during driving.

The woofer enclosure is made of high-density material and adopts a bass reflex system for damping and diffusion of low sound, and the lowest sound is damped by a sound absorbing material and radiated from a duct on the bottom of the cabinet to the back.
The exterior has a walnut finish and uses a unique Sa RUNNET that is covered on five sides with an emphasis on the directivity of Hail drivers.

Model Rating

Method	2-Way, 2-Speaker, Bass Reflex System, Floor Type
Units Used	For low band : 25 cm cone type High pass : Hail Driver
Frequency characteristic	45 Hz to 24 kHz ± 2 dB
Input impedance	4 Ω
Distortion factor (1m from SP at sound pressure of 90 dB)	600 Hz to 24 kHz : 0.5% 60 Hz to 600 Hz : 1%
Square wave rise time	20 μ s (5 kHz)
Allowable input	350W (peak input)
Crossover frequency	600Hz
External dimensions	Width 362x Height 787x Depth 362 mm