Audio Database

The

ESS amt1b
a price -- unknown (one set, at the 1970s time?)

Description
 
The floor type speaker system which adopted the heil driver and the passive radiator.

In amt1b, the completely same unit and network as amt-monitor are adopted, a heil driver is carried in a high region and a 30cm corn type Woofer and a 30cm passive radiator are carried in low-pass.

The accordion pleats made from Teflon are placed into the powerful magnetic field, and the heil driver has the structure where the element (electric conduction belt) was embedded on the side of each pleat of a pleat.
If a signal is impressed to this element, current will flow, by motion of a pleat, air is compressed and sound is emitted to space.
In order that a voice coil may emit sound to space directly by this operation, the outstanding dumping characteristic and low distortion are realized.

It is as heterogeneous as the pulp developed by the engineer of BBC on the corn of the 30cm Woofer adopted as low-pass, and vectren of the polystyrene compound is used for it.

The passive radiator was arranged so that the Woofer might operate in series on the rear surface immediately, and it has improved the low-pass play.


Rating of a mode
System 2 ways, 2 speaker passive radiator system, and a floor type
Use unit For low-pass: 30cm corn type
For high regions: Heil driver (electrostatic type)
Passive radiator: 30cm corn type
Frequency response 35Hz-23kHz±3dB
Output sound pressure level 90dB/W
Allowable input 375W Clean Power
Crossover frequency 1kHz
Dimensions Width 413x height 895x depth of 413mm
Weight 39.6kg