High-Power
Drive Capability
Although the
average power output required for normal living-room listening sistuations is
only a few watts, musical peaks can demand much higher outputs for brief
periods. If the required power is not available, the music loses its dynamic
vitality, sounding flat and dull. In this respect many amplifiers perform well
when connected to 8 Ω speakers, but faced with 6 Ω or 4 Ω loads - far more
common than 8 Ω speakers in the real world - they lose the ability to deliver
that all-important musical punch and impact.
Although
they have different maximum power outputs, TEAC integrated amplifiers deliver
outstanding dynamics power performance. All four models feature
"over-designed" power supplies with heavy-duty shielded power
transformers - the A-BX10 utilizes a toroidal transformer - and large
capacitors, plus parallel-connected output-stage power transistors. They will
respond to the demands of the most dynamic music without a trace of strain even
when driving low-impedance loads.
Straightforward
Circuit Configuration.
In an audio
amplifier greater sophistication is not the way to achieve better sound
quality. Each and every electronic part has some affect on the sound, and the
sum total can mean degraded performance. While it is relatively easy to achieve
mediocre. Performance with complex electronics, it is actually much more
difficult to design and build the kind of straightforward circuitry needed to
deliver pure transparent sound TEAC integrated amplifiers prove that it can be
done. Careful design coupled with painstaking parts selection and layout bring
you an audible sound-quality advantage.
Fully
Balanced Circuit Configuration
Another
significant TEAC amplifier design concept is the fully balanced circuit
configuration, used in the A-BX10 amplifier. The unbalanced analog signal is
instantly converted to a balanced signal in which the signal appears as the
difference between two identical amplifier circuits. This is contrary to the
unbalanced configuration where one amplifier circuit has the ground plane as
its reference. The balanced configuration cancels out power supply noise and
hum fieelds. Most importantly however, the ground plane only acts as the DC
reference for the output stage and is not included in the signal path.
Inside the
A-BX10
Source
selection is achieved by electronically controlled relays placed close to the
input terminals at the rear panel. The volume potentiometer is placed just
behind the relays. This configuration gives an extremely short signal path.
Furthermore,, the main PCB is of the double layer type, where the second layer
is mainly used to shield the sensitive low level inputs , so called
"Ground Plane"
Low NFB
Circuit Configuration
It is
commonly known that low overall feedback offers better stability and more
dynamic sound than high feedback, although the distortion level will be higher.
TEAC has chosen to design the amplifier circuits with very low overall feedback
and to limit the distortion through a number of local feedback and distortion
canceling techniques. The input stage is built using FETs with a voltage gain
of only two times and hih common mode rejection. For the large voltage
amplifier cell, an enhanced cascode with very low distortion is used. In the
output stage, uneven distortion is reduced by lowering the non-feedback output
impedance. Finally, the balanced output stage cancels out the even-harmonic
distortion. The is an amplifier with both low feedback and low distortion.
Specifications:
Continuous
Power Output (RMS):
100 W + 100
W at 8 ohms (20 - 20,000 Hz)
160 W + 160
W at 4 ohms (20 - 20,000 Hz)
Dynamic
Power Output:
120 W + 120
W at 8 ohms
220 W + 220
W at 4 ohms
Total
Harmonic Distortion (Continuous rated Output Power):
0,04% at 8
ohms (20 - 20,000 Hz -1 dB)
0,06% at 4
ohms 920 - 20,000 Hz -1 db0
Input
Sensitivity/Impedance:
Balanced
(XLR) : 1V/20 k Ω
CD, Aux
: 300 mV/20 k Ω
Tuner, Tape
: 300 mV/20 k Ω
Signal-to-Noise
Ratio (IHF-A): 106 dB
Frequency
Response:
Balanced
(XLR): 20 -40,000 Hz -1 dB
CD, Aux
: 20 - 40,000 Hz -1 dB
Tuner, Tape
: 20 - 40,000 Hz -1 dB
Dimensions (W x H x D):
443 x 1-3 x 381 mm
Weight
(net): 11,8 kg