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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





Audio Research SP-10

 Four Critical Performance Areas
The SP-10 have been widely acclaimed as representing the state-of-the-art. In music reproduction and each of these preamplifiers can provide the critical listener with true reference sound quality in the four critical areas of performance.
Clarity - Providing a clarity of sound that immediately impresses the listener. Audio Research preamplifiers are totally absent of the "heaviness" or "veiling" of sound present in other designs. There is also a notable lack of "hardness", "edge" and "grain" that masks fine detail in other preamplifiers.
High Definition _ While other preamplifiers obscure important musical information, Audio research preamplifiers reproduce all of the subtle colors, shadings and ambient detail that create the illusion of a "you are There" performance. The SP-10 effortlessly sort through complex musical material placing every instrument and voice onto the proper acoustic stage. This High Definition quality is a hallmark of all Audio Research products.
Harmonic Integrity - Audio Research preamplifiers provide the listener with a unique sense of "harmonic rightness". Delicate harmonic structures essential to musical accuracy remain wholly intact, creating a musical performance with a sense of "aliveness".
Dynamic Expression - Audio Research preamplifiers ecel in reproducing a musically accurate dynamic range. Highly stable power supplies and essentially overload-proof output sections result in preamplifiers that reproduce the guietest notes to the loudest and most complex musical passages. Separation of instruments and voices remains intact at every level without "smearing" or collapse of sound field.

Features
Automatic muting for continuous protection
Front panel muting for repeat settings, interruptions, etc.
Front panel power switch for activating 1600 watt capacity back-chassis, plug-in power receptacles.
Selectable front panel impedance matching for optimizing moving coil and moving magnet cartridge performance
Front panel gain selection for matching low output or high output cartridges
Front panel "bypass" switch for optimizing performance
Sonically selected components and near military grade construction
Specifications
Frequency Response:
High Level :  + .25 dB; 5 Hz - 30 kHz
Magnetic Phono :  + ,25 dB of RIAA, 30 Hz - 40 kHz
Harmonic Distortion:  less than ,01% at 2V RMS output, 20 Hz -20 kHz
Input Impedance: 
High Level :  50 k Ω, all inputs
Magnetic Phono :  10,30, 100, 10 k, 47 k Ω (selectable)
Noise:
High Level :  250 µV RMS maximum residual unweighted wideband noise
Magnetic Phono :  2 µV  RMS above 1 kHz
Dimensions (W x Hx D):  19" x 5,25" x 10,25"

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