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 SR-3E

 Stasis Amplification
Audiophiles who hear the SR-3E are amazed at its effortlessly transparent sound. Music has more detail, more impact, more realism - especially when reproduced on "difficult" top-quality speakers. The reason is our "Stasis" power amplifier - the same concept used in the PA-7 and PA-5 Power Amplifiers.
STASIS is a radically different and superior design in which two amplifiers drive the speaker; a high-quality low-power amplifier and a "Current-Mirror Bootstrap" to supply muscle. The low-power amplifier can be designed for virtually perfect performance, "global" feedback isn't needed as in ordinary power amps. Removing the overall  feedback ensures uniform output impedance and inherent stability, and, since the amplifier is stable, there's no need to isolate it from the speaker with a coil as is usually done. This permits the amplifier to control the speaker more preciselly and realize its full potential. The current bootstrap provides tremendous peak-current reserves - up to 25 ampers into low-impedance loads.
Power Amplifier Section
Continuous Average Output Power (IHF-A):  45 watts per channel (8 Ω, both channel driven, 20-20,000 Hz, no greater than 0,1% T.H.D.)
Dynamic Output Power (both channel driven): 
64 watts per channel into 8 Ω
80 watts per channel into 4 Ω
Dynamic Headroom (IHF-A):  1,5 dB
Power Bandwidth:  5 -40,000 Hz
Frequency Response (IHF-A):  5 Hz - 75 kHz  +0 -3 dB
Signal-to-Noise Ratio:  better than 105dB (rated power); better than 85 dB (IHF-A-202)
Total Harmonic Distortion (Rated Power, 8 Ω):  less than 0,1% (20 - 20,000 Hz)
Intermodulation Distortion (Rated Power, 8 Ω):  less than 0,15% (60 Hz :7 kHz = 4 : 1)
Headphone Rated Output (40 ohms):  105 mW
Output Current Capability:  18 A peak per channel
Preamplifier Section
Input Sensitivity (for Rated Output):
Phono MC (gain; 32/24 dB):  60/150 µV
Phonoo MM :  2,5 mV
CD, Tape, Video:  200 mV
Sensitivity (1 watt, IHF-A):
Phono MC (Gain; 32/24 dB):  8,9 / 24 µV
Phono MM :  0,37 mV
CD, Tape, Video :  30 mV
Input Impedance:
Phono MC :  100 ohms
Phono MM :  47 k Ω
CD, Tape, Video :  20 k Ω
Maximum Input Level (1 kHz):
Phono MC (gain; 32/24 dB):  3/8 mV
Phono MM :  140 mV
Record Output Level/Impedance:  200 mV/1 k Ω
Total Harmonic Distortion (20  20,000 Hz, to Rec Out at 1 V):
Phono MC :  less than 0,003%
Phono MM :  less than 0,002%
RIAA Deviation:  30 - 20,000 Hz ±0,5 dB
Signal-to-Noise Ratio (to speaker output, IHF-A):
Phono MC :  better than 73 dB (32 dB gain); better than 72 dB (24 dB Gain)
Phono MM :  better than 80 dB
Tone Control
Bass:  20 Hz ±10 dB
Treble:  20 kHz ±10 dB
 Loudness:  20 Hz +10 dB; 20 kHz +6 dB
Subsonic Filter (Phono only):  20 Hz, -12 dB/octave (cutoff Frequency)
FM Tuner Section
Frequency Range:  87,5 - 108 MHz
IHF Usable Sensitivity [mono]:  11 dBf (1,9 µV)
-50 dB Quieting Sensitivity [mono/stereo]:  21,0 dBf (6,1 µV) / 42,0 dBf (69,0 µV)
Signal-to-Noise Ratio at 65 dBf [mono/stereo]:  better than 74 dB / 69 dB
Muting Threshold:  30 dBf/17,3 µV
Frequency Response:  20 Hz - 15 kHz ±1 dB
Total Harmonic Distortion [mono/stereo]:  less than 0,12% / 0,20%
Capture Ratio:  2,0 dB
Alternate Channel Selectivity:  70 dB (±300 kHz)
Stereo Separation at 1 kHz:  better than 43 dB
Spurious Response Rejection:  better than 90 dB
Image Rejection:  better than 75 dB
IF Rejection:  better than 80 dB
AM Suppression:  better than 60 dB
AM Tuner Section
Frequency Range:  522 - 1611 kHz
Sensitivity:  53 dBµ/m
Signal-to-Noise Ratio (at 90 dBµ/m):  better than 52 dB
Total Harmonic Distortion (at 90 dBµ/m):  less than 0,3%
Selectivity:  better than 20 dB (±10 kHz)
Power Source:  110,120,220 or 240 V AC, 50/60 Hz
Power Consumption:  270 watts max
Convenience Outlets:  2 x switched; 1 x unswitched
Dimensions  (W x H x D):  430 x 100 x 370 mm (16-15/16" x 3-15/16" x 14-9/16")
Weight:  8,5 kg (18 lbs 12 oz)

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