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





Sherwood S-9400

 Sherwood Model S-9400 Solid State Stereo/Dynaquad Amplifier
The perfect match for the S-2400 tuner. Model S-9400 represents true superiority in features, flexibility and specifications. Inputs for two phonos, microphones, two auxiliary inputs, tape deck plus 4-channel decoder (or a second tape deck). Power output of 100 watts RMS (8 ohms, both channels driven at 1 kHz) is outstanding. And built-in Dynaquad Four-Channel matrixing circuit offers thrilling 4-channel sound. Distinctive styling matches the S-2400 tuner (the walnut  case is included at no extra charge)

Design Features
160 watts of power (IHF) at 8 ohms, 50 + 50 watts (RMS) at 8 ohms (at 1 kHz); 40 + 40 watts from 20 - 20,000 Hz. Direct coupled output circuitry. 3 stage preamp section with FET for improved overload equalization accuracy. Instant overload protection (power monitoring relay electronically disconnects speakers if any D.C. potential is detected thus eliminating any damage to amplifier or speakers.)
 Control Features
Master on/off volume control which automatically adds bass at low volume settings. Five position program source selector with complementary indicator lights. High and low filters for eliminating high frequency hiss and low frequency rumble. Linear balance control. Speaker selector switch for controlling 2 sets of speakers, individually or simultaneously. Tape monitor switch for tape playback or direct tape monitoring while recording. Front panel tape jacks for headphones and tape-to-tape dubbing. Loudness switch for defeating automatic bass compensation in loudness control. Full mode switch for monitoring each channel separately, stereo, stereo reverse, or mono.

Four Channel Features
Special individual inputs and outputs for a four channel decoder (may also be used as a second tape monitor) - controllable with front panel "four channel" switch. Built-in Dynaquad four channel matrixing circuit - merely add 2 additional speakers for thrilling four channel sound.
Specifications
Power Output:  Total music power 160 watts (IHF)
RMS Power Output (both channel driven):
2 x 60 watts at 4 Ω, 1 kHz
2 x 50 watts at 8 Ω, 1 kHz
2 x 40 watts at 8 Ω, 20 - 20,000 Hz
Harmonic Distortion:  0,8% (at 8 Ω rated output; 0,10% at 10 watts)
Intermodulation Distortion:  0,6% (at 8 Ω reted output; 0,25% at 10 watts)
Speaker Output Impedance [stereo, mono]:  4, 8 or 16 Ω
Stereo Headphone Output: High or Low output
Stereo Recording Output:  230 mV, 2 k Ω
Power Bandwidth:  5 - 45 kHz -1% Dist.
Frequency Response:
Aux :  20 - 20,000 Hz ±½ dB
Phone :  RIAA standard ±1,0 dB
Damping Factor:  40 : 1 at 8 Ω
Bass Control :  ±12 dB at 100 Hz
Treble Control :  ±12 dB at 10 kHz
Input Sensitivity (for rated output):
Phono :  1,8 mV
Aux :  200 mV
Mic :  2,1 mV
Input Capability (for 1% Dist.):
Phono :  80 mV
Aux :  Infinite
Mic :  60 mV
Hum and Noise (IHF):
Phono :  -60 dB
Aux :  -85 dB
Vol. Control Min. :  -90 dB
Crosstalk:  -45 dB at 1 kHz
Mic. Input Impedance:  50,000 Ω
Power Requirements:  115 - 125 V, 50/60 Hz;  20 -200 watts fused
AC Outlets:  Switched (2 total) 180 watts; unswitched (1 total) 200 watts
Dimensions (W x H x D):  17½" x 5½" x 14"
Weight (shipping):  29 lbs

Cabinet :  walnut case included

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