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 AR 10 π (1977)

The Acoustic Research 10π is a new speaker system from Acoustic Research that addresses itself to these considerations. Under actual listening conditions, the AR-10π delivers as flat an energy response as the state of the art permits. And it is able to maintain this response characteristic under a great variety of conditions of use. The result is a further significant improvement in the degree of realism with which music can be heard in the home.

The AR-10π - is designed to reproduce music in the home as accurately as the state of the art permits. Its ability in this respect represents a number of significant evolutionary improvements over previous designs. Further the AR-10π - is intended to offer an unprecedented degree of flexibility without any sacrifice in accuracy. The combination of these characteristic, we believe, represents a significant step forward in loudspeaker design.

 The AR 10π is a no-compromise 3 way speaker system with excellent dispersion and even energy output all across the audible spectrum. A pair of 3 position switches allows the owner to adjust the mid and high-range drivers to the "liveliness" of the room while the 3-position woofer environmental control allows the owner to adjust the low-end response to speaker placement. This allows the owner to place the speakers on the center of the wall, on the floor against the wall or away from the wall.

Drive units:
Low-Frequency:  300 mm (12 in.) acoustic suspension woofer,
Mid-Frequency:  38 mm (1-1/2 in.) hemispherical dome midrange,
High-Frequency:  19 mm (3/4 in.) hemispherical dome highrange.
Crossover Frequencies:  525 Hz, 5000 Hz
Frequency Range:  27 Hz-30 kHz
Impedance:  4 - 8
Sensitivity:  9 watts
Three 3-position switches for woofer environmental control and for midrange and highrange level control
4 to 8 nominal, depending on switch positions, highest impedance in π and -6 dB switch positions, lowest in 4π and 0db
1 watt will produce 86 dB SPL on axis at 1 meter.
Amplifier Power Requirement:
25 watts (into one speaker only) will produce 100 dB SPL in a 3000 cu π room of average reflectivity (energy absorption coefficient of 0,15), 50 watts (25 watts per channel) will produce 103 dB SPL in the same room.
Power Handling Ability:
May be used with amplifiers capable of delivering up to 150 watts continuous power per channel being driven to clipping 10 % of the time, on normal music material source
Nominal Power Handing: 100 watts (max, 250)
Crossover Network:
Half-section LC network on each driver using air-core chokes and computer grade bi-polar electrolytic capacitors. acoustic output of midrange and highrange drivers as well as the normalizing of woofer output for the three basic environments accomplished via an autotransformer and individual switching networks
Driver Resonance Frequencies:
Woofer 18 Hz (free air), midrange 400 Hz, highrange 400 Hz
System Resonance Frequency:  42 Hz
System Low Frequency Response:  -3 db at 35 Hz
Effective System Q:  0.75
Flux Density:  Woofer 9800 gauss, midrange 13000 gauss, highrange 14000
Volume of Enclosure:  41.9 liters (1.48 cu. ft.)
Cabinet Dimensions:  354 x635 x 273 mm deep (13-15/16 x 25 x 10-3/4 in.)
Weight:  unpacked 24.9 kg (55 lb.)

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