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 KR-9400

Kenwood KR-9400 AM/FM Stereo Receiver
Thr Kenwood KR-9400 stands as one of the truly great stereo receivers of the world, meeting the demands of th emost critical purist with the power, performance, and flexibility usually found only in the most expensive of separate components. The KR-9400 is the culmination of years of research and development on the part of Kenwood's engineering team, who have designed this very special unit with but one purpose in mind; to achieve the highest possible performance, regardless of cost.

A masterpiece of engineering with features never before incorporated in a stereo receiver.
Unique Kenwood Triple-Function Meter converts from Signal Strength Meter to Multipath detector to Deviation Meter at the touch of a button.
New Tape-Through Circuit permits tape-to-tape dubbing while you listen to another program source
New kenwood Injection Circuit mixes sound from any source into tape-to-tape dubbing
Triple Tone Controls provide full Bass, Treble, and Mid-range tonal compensation, with Defeat Switch for completely flat response.
Phase-Lock-Loop MPX Circuit; delivers exceptional FM-stereo separation for vivid directionality
Dolby FM Switch ; provides for the addition of a Dolby FM Adapter for best reception of Dolbyized FM broadcasts.

The Tuner Section
Famous the world over for the exceptional performance of its tuners, Kenwood outdoes its own reputation with the superb performance of the AM,FM and FM-stereo tuner section of the KR -9400
The FM Front End. To achieve the theoretical limit in FM sensitivity (1,7 µV), the KR-9400 incorporates an insulated dual-gate MOS-FET, combined with four separate tuned circuits. The extremely linear input of the r.f. stage is virtually impervious to cross-modulation and other forms of overload distortion.
The FM-IM Section. The high alternate channel selectivity (*) dB) and the remarkable capture ratio (1,3 dB) of the KR-9400 are the direct result of the permanently aligned solid state i.f. filter, a multi-function IC and five bi-polar transistors in the i.f. stage.
The Phase-Lock Loop Stereo Multiplex Decoder Section.
The kR-9400 provides extremely high FM-stereo separation throughtout the audio spectrum, thanks to the newly  developed phase-lock-loop IC circuit incorporated in the stereo FM decoder section, achieving more than 45 dB separation at 1 kHz; better than 35 dB at all frequencies from 30 Hz to 10 kHz.

The amplifier Section
The KR-9400 is the most powerful stereo receiver Kenwood has ever built, delivering a minimum of 120 watts of contiuous power per channel into 8 ohms speakers, both channels driven, 20 Hz to 20 kHz, with no  more thn 0,1% Total Harmonic Distortion
Direct-Coupled, Pure Complementary Symmetry Output Circuit
Kenwood;s advanced engineering eliminates the coupling capacitor between  output and speakers, so no distorting element stands  between you and the music. As a result you enjoy flat frequency response from ultra-lows to highest highs, a high damping factor (50 at 8 ohms), faithful bass response throughout the audio spectrum.
Large Power Transformer, Oversize Heat Sinks. A cool-running power transformer and massive heat sinks form the heart of a dual positive-negative power supply to the high-output transitors stages. This nocompromise design assures safe, cool operation even under continuous full-power output.
ASO protection Circuit. Kenwood 's "Area of Safe Operation" protection circuit will not interrupt your listening as long as the KR-9400 is operating within safe limits.shopuld those limits be exceeded, however, the sensitive electronic circuit with relay instantly disengages speakerrs.
Unique " Tape-Through" Circuit. The double tape monitoring facilities of the KR-9400 permit recording simultaneously onto two tape decks or dubbing from ona deck to the other. A unique "Tape-Through" cicruit carries recording convenience a step further by permitting the dubbing process to continue uninterrupted, even while the KR-9400 is being used to play another program source. Its's like owing two stereo systems in one.
The Preamplifier Section
The precision  equalizer-phono preamplifier section of the KR-9400 uses low-noise metal-encapsulated transistors to deliver an exceptionally high Signal-to-Noise ratio and assure utmost circuit reliability. Up to 300 mV (P-P) of input signal can be accomodated at less than 0,1% total harmonic distrotion, from a mere 2,5 mV phono input sensitivity.

FM Tuner Section
Usable Sensitivity (IHF):  1,7 µV
Quieting Slope ( at 5 µV / 10 µV / 50 µV):  56 dB / 63 dB/ 72 dB
Signal-to-Noise Ratio:  72 dB
Capture Ratio (IHF):  1,3 dB
Selectivity Alt. Ch (IHF):  80 dB
Stereo Separation ( at 1 kHz / 10 kHz):  45 dB / 35 dB
Total Harmonic Distortion:
Mono :  0,3%
Stereo :  0,5%
Image Rejection Ratio:  80 dB
IF RejectionRatio:  100 dB
Harmonic Spurious Rejection:  90 dB
AM Suppression:  55 dB
Sub-Carrier Suppression:  62 dB
Antenna Impedance:  300 Ω balanced; 75 Ω unbalanced
AM Tuner Section
Uasble Sensitivity (IHF):  15 µV
Signal-to-Noise Ratio:   50 dB
Selectivity (IHF):  35 dB
Image Rejection Ratio:  70 dB
IF Rejection Ratio:  70 dB
Main Amplifier Section
Power Output: 120 watts per channel
Intermodulation Distortion:  0,1%
Preamplifier Section
Input Sensitivity/Impedance
Phono 1 and 2:  2,5 mV / 50 k Ω
Aux, Tape Play A, B:  150 mV/50 k Ω
MIC :  2,5 mV / 50 k Ω
Hum and Noise
Phono 1 and 2 :  70 dB
Aux and Tape :  93 dB
Mic :  65 dB
Output Voltage/Impedance
Tape Rec A, B
PIN :  150 mV/ 100 Ω
DIN :  30 mV/80 k Ω
Tone Controls
Bass :  ±10 dB at 100 Hz
Midrange :  ±10 dB at 800 Hz
Treble :  ±10 dB at 10 kHz
At 100 Hz :  8 dB
At 10 kHz :  5 dB
High Filter:  12 dB/oct turnover 7 kHz
Low Filter:  12 dB/oct turnover 100 Hz
Power Requirements:  110/120 V 50/60 Hz
Power Consumption:  415 watts at full power; 60 watts at no signal
Dimensions (W x H x D):  21-15/16" x 6-9/16" x 15-9/16"
Weight:  45,4 lbs

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