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

Kenwood KA-4000

 Kenwood 120 Watt Solid State Amplifier Model KA-4000
120 watts of IHF standard total music power enough to drive even low efficiency Hi-Fi speaker
The wide power bandwidth of 13 Hz to 30,000 Hz with very low IM distortion
Lever type -20 dB muting switch of quick response for momentary quietness during telephone call, etc.
2 dv step type tone controls
Blue light indicators for input selector switch
Lever type high and low filter switches
Pre-amplifier outputs for use with other power amplifier or multichannel system.
Main amplifier inputs for the use with pther pre-amplifier, tuner and tape recorder with pre-amplifier, and also these inputs enable you to drive the main amplifier directly
Speakers terminals for 2 sets of stereo speakers and front panel speaker selector switch (A, B, A & B and Phones)
Large Volume/Balance controls knob located in center of front panel.
Exclusive blow-out proof automatic circuit breaker protects power transistors

Power Output (continous power; at any frequency from 20 -20,000 Hz):
Total Music Power (IHF):  120 watts at 4 Ω;  100 watts at 8 Ω load
Continuous Power:
Each channel driven:  53/53 watts at 4 ohms load;  40/40 watts at 8 ohms load.
Both channels driven;  41/41 watts at  4 ohms load;  32/32 watts at 8 ohms load.
Power bandwidth (IHF):  13 Hz to 30,000 Hz
Harmonic Distortion:  Less than 0,5% at rated output from 20 to 20,000 Hz
Intermodulation Distortion (60 Hz & 7,000 Hz, 4:1): 
Less than 0,3% at rated output or at any level of less than rated output;
Less than 0,1% at -3 dB rated output
Frequency Response:
Main Amp. only;  18 Hz to 50,000 Hz ±1 dB
High Level Input;  20 Hz to 50,000 Hz ±1 dB
Sensitivity (fro rated output at 8 ohms load):
Phono 1;  2 mV
Phono 2:  2 mV
Tape Head:  2,3 mV
MIC: 2 mV
AUX:  200 mV
Tuner:  200 mV
Tape Play:  200 mV
Main Amp Input:  100 mV
Input Impedance (at 1,000 Hz):
Phono 1 :  50 Kohms
Phono 2 :  50 Kohms
Tape Head :  100 Kohms
MIC :  100 Kohms
AUX,Tuner,Tape Play :  100 dB
Main Amp. Input :  300 kohms
Signal-to-Noise Ratio (below rated output):
Phono 1 :  65 dB
Phono 2 :  65 dB
Tape Head :  63 dB
MIC :  67 dB
AUX, Tuner, Tape Play :  77 db
Noise at minimum volume control: 1mV at 8 ohms or 0,0125 milliwatts.
Output Impedance (at speaker terminal):
0,29 ohm at 1,000 Hz
0,52 ohm at 50 Hz
0,29 ohm at 10,000 Hz
Damping Factor (at 1,000 Hz):
55 at 16 ohms load
27,5 at 8 ohms load
Low Filter (for rumble):  80 Hz Cutoff, 12 dB per Octave
High Filter (for scratch ):  8,000 Hz Cutoff, 12 dB per octave
Bass control:  ±10 dB at 1000 Hz with 2 dB step switch
Treble Control;  ±10 at 10,000 Hz with 2 dB stepswitch
Power Requirement/Consumption:
AC 110-120/220-230 volts, 50/60 Hz
18 watts quiescent. 190 watts at full power
Dimensions:  16⁵/₁₆"  x  5 ⁵/₃₂"  x  11 ¹/₃₂" (W x H x D)

Weight: 17,6 lbs

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