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





Nakamichi IA-3

The Essential Features:
In the interest of musical resolution and sonic transparency only an input selector, a record output selector, a volume control, and a power switch are provided. Inputs are available for Tape, CD, Tuner and Aux.
The amplifier circuits are 100% discrete -  no ICs are used. All parts are of the finest quality. Voltage amplification is performed by a differential two-stage circuit.
The IA-3 power amplifier section is rated at 40 watts per channel (stereo) into 8 ohms. The oversized power supply and high-current output stage, however, result in considerable dynamic headroom, enabling the clear reproduction of demanding musical peaks.  The amplifier low-impedance drive capability is exceptional. Efficient dissipation of thermal energy is assured by heat sinks made of black almite.
Starting at the inputs, separate ground lines are maintained for the left and right channels, becoming common only at the speaker outputs. This through left/right ground isolation is especially important in the low-level stages and contributes to greatly enhanced stereo separation and imaging.

Conventional designs with monitor switches require a contact point in the signal path, and the constant load of a monitor output is detrimental to signal purity. The IA-3 takes a different approach the record output selector is not part of the main signal path and, hence, has no advers affect on sound quality.
The power supply section and audio circuits are on separate printed circuit boards to prevent any unwanted interaction.
The selectors, volume control, and input/output jacks are arranged to maintain the shortest possible signal path.
A heavy-duty chassis with a dual-plate bottom eliminates "ringing" and effectively shields the amplifier circuits from external interference.
The power transitors, volume control, and blocking capacitors are all high-grade components designed specifically for exacting audio applications.
The CD input jacks are gold-platted.
The front panel and the control knobs are made of heavy-gauge aluminum.
Screw-type terminals are provided for speaker connection.

Specifications:
Power Amplifier Section
Rated Power Output: 
40 watts per channel into 8 Ω (both channels driven, 20-20,000 Hz; 0,1%THD)
65 watts per channel into 4 Ω (DIN, both channels driven 1 kHz; 1%THD)
Dynamic Power Output:
57 watts per channel into 8 Ω
80 watts per channel into 4 Ω
Power Bandwitdth:  10 - 40,000 Hz
Frequency Response:  20 - 20,000 Hz +0, -1 dB; 10 - 60,000 Hz =0, -3 dB
Signal-to-Noise Ratio: 
better than 103 dB rated power (A-weighted,, input shorted)
better than 83 dB (A-weighted, input shorted , IHF-A-202)
Total Harmonic Distortion:  0,1% or less (8 Ω, rated power,, 20-20,000hz)
Peak Current Capability:  12 A
Preamplifier Section
Input Sensitivity/Impedance:  150 mV/20 k Ω
Output Level/Impedance:  150 mV/1 k Ω (Rec Out)
General
Power Requirement:  110, 120, 220, 240 V AC, 50/60 Hz
Power Consumption:  210 W max
Dimensions (W x H x D):  430 x 75 x 320 mm
Weight:  7 kg approx.

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