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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





Marantz 1122DC amplifier

Stereo Console Amplifier Features:
Low TIM Design
DC Amplifier
Bas, Midrange and Treble Controls
Low and High Filters
Full Complementary Direct Coupled Output
Two Tape Monitors
Tape Copy Facilities

Shown in optional walnut veneer cabinet 
Technical Specifications
Amplifier Section
Rated Power Output (Min. Contiuous Average Power per Channel, both Channel Driven):  61 W (Power band:  20 Hz to 20 kHz; Total Harmonic Distortion:  0,03%; Load Impedance:  8 Ω)
Rated Power Output (Min. Contiuous Average Power per Channel, both Channel Driven):  77 W (Power band:  20 Hz to 20 kHz; Total Harmonic Distortion:  0,09%; Load Impedance:  4 Ω)
IM Distortion (IHF method, 60 Hz and 7 kHz mixed 4 : 1 rated power output)
At 8 Ω Load Impedance :  0,03%
At 4 Ω Load Impedance ;  0,09%
Damping Factor (at 20 Hz):  60
Sensitivity (at Main In):  1,5 V
Impedance (at Main In):  30 k Ω
Frequency Response (power Amp Only):  20 Hz to 20 kHz ±0,2 dB (at 1 watt output)
Signal-to-Noise Ratio (Main In "A" weighted):  110 dB
Preamplifier Section
Phono
Input Overload at 1 kHz:  200 mV
Equivalent Input Noise ("A" weighted):  0,48 µV
Dynamic Range:  109 dB
Input Sensitivity:  1,8 mV
Input Impedance:  47 k Ω
Frequency Response (RIAA 20 zh to 20 kHz):  ±0,3 dB
Signal-to-Noise Ratio ("A" weighted, at rated output and 7,75 mV input):  83 dB
High Level (Aux and Tape)
Input Sensitivity:  180 mV
Input Impedance:  20 k Ω
Frequency Response (includes power amp.):  5 Hz - 60 kHz ±0,1 dB
Signal-to-Noise Ratio ("A" weighted; ref.to rated output and 775 mV input):  93 dB
Output levels
Tape Out (ref. 7,75 mV at phono input):  775 mV
Pre Out (ref. 180 mV at Aux inputs):  1,5 V
(ref. 500 mV at Aux inputs, main amp disconnected):  4,2 V
Output Impedance
Tape Out :  330 Ω
Pre Out :  220 Ω
General
Power Requirements (USA only):  120 V AC, 60 Hz
Power Consumption (at rated output, both channels operating):  250 watts
Idling Power (Volume Control at zero):  50 watts
Dimensions (W x H x D):  416 x 146 x 312 mm (16-3/8" x 5-3/4' x 12-3/8")
Weight (Unit alone):  12,5 kg (27,5 lbs)
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