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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





Luxman M-03



 "Luxman M-03 power amplifier is rated at 200 Watts per channel into 8 ohms and is suitably massive, with huge vaned heat-sinks, each weighing 15kg, running along both ends of the chassis, and a power supply based around two 15,0001.tF block capacitors for each channel. There is provision for combined (bridged) mono operation when the power rating becomes 480 Watts into 8 Ohms. This mode is called BTL (Balanced Transformerless) and must be deliberately selected on the rear panel, where a security plate has been fixed at the factory to hold the switch in its normal stereo position."


 "Separate left and right channel attenuators are situated on the front panel and there is also a two-channel digital display of peak power level in Watts. A switch gives a choice of 1 or 3 seconds hold-time for the peak reading to make for easier monitoring under various programme conditions or, if you find the display distracting, it can be switched off. The power reading is related to the nominal loudspeaker impedance value selected on a three-position switch on the rear panel (4, 6 or 8 Ohms). Heavy duty terminals are fitted for two pairs of loudspeakers and front panel switches select speakers A, B, A + B or both off. "

 "M-03 power amplifier handbook shows how it would be possible to operate the C-03 preamplifier into two M-03 power amps each in the BTL mono mode to provide a hefty 480 Watts-per-channel (neighbours, ears and loudspeakers permitting)."
Gramophone ,   august 1988
Specifications M-03
Power Output (8Ω, 20-20,000Hz, 0,03% THD):  200 W
Max Power Output (at 1% THD, 4Ω, 1kHz):  250 W
Input Sensitivity/Impedance (1kHz):  1V/45 KΩ  ±20%
Frequency Response:  20 - 20,000 Hz +0 -0,3 dB (5Hz - 100kHz -0 -1 dB, +0,5 -2 dB)
S/N Ratio (input Terminal Shorted):  110 dB
Total Harmonic Distortion (at 200W Output, 8Ω, 20-20,000Hz):  0,03%
Residual Noise:  120 µV
Cross Talk:  1 kHz, 70 dB (10 kHz, 55 dB)
BTL Section
THD (at 450W, 8Ω, 20-20,000Hz):  0,1%
Max Power Output:  450 W (at 1% THD, 8Ω, 1kHz)
Input Sensitivity (1kHz):  0,75 V  ±20%
S/N Ratio (Input Terminal Shorted):  96,5 dB
Power Supply:  AC 120/220/240 V  50/60 Hz
Power Consumption:  120V, 10 A
Semiconductors:  11 ICs, 74 Transistors, 4 FETs, 47-49 Diodes, 6-8 Zener Diodes
Dimensions (W x H x D):  438 x 166 x 420 mm
Weight:  23,6 kg


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