Esoteric AZ-1 User manual

Esoteric’s new model AZ-1, a “Class D” integrated digital amplifier
combined with a master clock sync generator, is powered by a “WB”
wound core transformer
A WB* power transformer is a wound core type transformer, a new technology which offers
highly efficient and outstanding performance for its size dimension.
The WB power transformer incorporates a very unique “reversed” design concept to its coil
and core structure in that the steel core is wound to the coil.
*WB = Wound Core type Transformer with Coil Bobbin
1. High speed, consistency and highly efficient power supply ability.
The WB transformer incorporates a wound steel core that surrounds the coil. This innovative
design ensures the maximum performance of the steel core.
Fig.1 below shows a simplified model of the magnetic paths of WB and conventional
transformers.
The WB design ensures the shortest magnetic path from the coil (because the coil surface
and the core surface are at a constant distance at the same radius) and the magnetic path
generated from the coil fully magnetizes the steel core without any loss. This creates a
power output supply is more constant than other designs.
From an audiophile perspective, the end result is similar to the high end sonic characteristics
achieved by tube equipped integrated power amplifiers.
Thanks to this magnetically efficient design, the WB transformer responds directly to the
requirements of current need, as requested by the drive circuit. This results in lossless power
output, high speed response and ultra efficient power supply ability.

fig.1
WB transformer Conventional transformer
2. Small size dimension
Thanks to the magnetically efficient design, the WB transformer can draw larger current
compared to conventional transformers of the same size.
3. Low leakage of magnetic flux, vibration and noise
The WB transformer incorporates a very smooth core surface without any cutting surface or
joint. This core design keeps the leakage of magnetic flux, vibration and noise extremely low
(compared to conventional transformers where the core is composed of several parts).
4. The bottom line for the Esoteric AZ-1
The WB transformer and audio output stage design, unique to Esoteric’s model AZ-1,
provides “tube like” audio performance from a “Class D,” integrated digital amplifier. The WB
transformer enables ultra efficient power output, high speed response time and greatly
reduced potential for noise, magnetic flux leakage and vibration.
With the added feature of a WORD clock output signal, timing between a compatible DAC
and transport can be re-synchronized to +/- 1ppm. The AZ-1 includes inputs for up to 6
digital devices and 3 line level inputs, including magnetic phono. The product is truly unique!
For more information on the AZ-1 amplifier/master clock please visit:
http://www.teac.com/esoteric/AZ-1.html
Coil Coil
Steel core
Magnetic path
Magnetic loss