What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Teac A-BX10

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.

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

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