JVC A-X55 Service Manual

2.
Technical
Explanation
of
‘‘Dynamic
Super-A”’
2-(1)
Basic
Configuration
of
‘‘Dynamic
Super
A’’
Power
Amplifier
This basic configuration is as shown below.
Newly
developed
‘‘isolate
drive
circuit’’
and
‘‘wave
correction
circuit’’
are
added
to
the
conventional
Super
A
bias
circuit.
In
addition,
newly
developed
IC
exclusive
for
Dynamic
Super
A
is
employed
in
the
Super
A
bias
circuit.
Function:
Effect:
Isolate Drive Circuit
Purpose:
amplification stages.
Idealizes the interface between the voltage and power
Drives the power stage at low impedance by FET independent
of the output impedance of the voltage amplification stage.
speaker impedance.
1. Always drives at low distortion without the influence of the
2.
Improves
the
absorption
ability
of
the
speaker
counter
electromotive force.
Input
Dynamic Super A
Voltage
amp. stage
Isolate
drive circuit
Wave correction
processor
Power
amp. stage
Output
Purpose:
Function:
Effect:
Wave Correction Processor
Reduces the non-linear distortion of the
transistors in the power stage.
Corrects the signal to the power stage in
advance.
Reduces the distortion by 20-40 dB more
than the conventional processor. Thus,
this amplifier can be said to be the non-
feedback amplifier.
\
New Super A IC
Newly developed monolithic IC exclusive
for Dynamic Super A which improves fur-
ther the current linearity and high-speed
response ability as compared with the
conventional Super A IC.
Fig. 1 Block Diagram of Dynamic Super A
A-X55
No. 2589

JVC A-X55 Specifications

General

Brand	JVC
Model	A-X55
Category	Amplifier
Language	English