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

Acoustic Research Tuner

Tuner Specifications
Sensitivity:  2,0 µV or better, for 30 dB of quieting (IHFM)
Signal-to-Noise Ratio:  65 dB (ASA "C" weighting)
IM and THD : 0,25% or less (mono)
IM and THD : 0,5% or less (stereo)
Frequency Response:  20 Hz to 15 kHz  ±1 dB (mono and stereo)
Capture ratio:  2,0 dB or less
Selectivity:  55 dB or better (alternate-channel)
AM Suppression:  55 dB or better
Spurious Response: 
Image Rejection : 70 dB or better
IF rejection : 100 dB or better
Other responses : 90 dB or better
35 dB minimum at 50 Hz
40 dB minimum at 1 kHz
30 dB minimum at 10 kHz
Output Level:  750 mV RMS minimum for 100% modulation (at max. setting of level control)
Output Impedance:  less than 1 k Ω, will drive loads of 10 k Ω or higher

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