Audio Database


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

The book shelf type speaker system which carries a heil driver.

In amt-bookshelf, 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.
Moreover, a 30cm passive radiator is mounted by the rear surface.

The network of 18 dB/oct is used for the crossover of a heil driver and a Woofer. It can carry out continuation variable [ of the inside loud sound beyond a 1kHz crossing point ] to "+3dB - -infinity."

Rating of a mode
System 2 ways and 2 speaker passive radiator system
- Book shelf type
Use unit For low-pass: 30cm corn type
For high regions: Heil driver (electrostatic type)
Passive radiator: 30cm corn type
Frequency response 40Hz-23kHz±3dB
Output sound pressure level 90dB/W
Allowable input 375W Clean Power
Crossover frequency 1kHz
Dimensions Width 356x height 610x depth of 356mm
Weight 29.5kg