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 TSW 910 (1987)

The TSW 910 and 810

These two flagship models represent the best in stereo loudspeakers. Dual woofers - one on the front and one on the rear - provide bass power down to the limits of audibility and because the woogfers are on different cabinet surfaces, room effects which can cause cancellations in the critical mid-bass region are virtually eliminated. These superior models also incorporate the most advanced dome tweeter AR has used to date. A 1" titanium dome with its own specially designed Tetra-helix mounting plate and acoustic lens produces teh most accurate harmonic structure and sense of spaciousness ever offered in an AR loudspeaker. The TSW 910 has bi-wire capability for those who wish to maximize the performance of thier sound system.


Even tweeter mounting plates can degrade the sound if they have a regular shape. In the TSW Series we have avoided this problem by emploing a special computer designed tweeter face plate called a Tetra-helix. The Tetra-helix is shaped to broadly distribute and minimize any re-radiation so that no single frequency is affected by edge diffraction. The result is a much smoother response and more natural treble.

Polypropylene cones.

The carbon-loaded polypropylene cones used in AR woofers and midranges in the TSW Series have all been designed for low coloration, natural sound and superior power handling for realistic dynamics, particularly with modern digital CD and high-quality analog source material. Polypropylene is an ideal cone material and offers unrivalled sonic naturalness and reliable production consistency. in the TSW Series our twelve, ten, eight and six inch woofers and six inch midrange have all been designed for excellence. The woofers generate clean, deep natural bass,while the midrange unit has controlled dispersion for optimum stereo imagery

Acoustic Suspension

Acoustic Suspension is a system invented by Acoustic Research which makes deep clean bass possible from enclosures of all sizs. Its revealing naturalness is ideal for compact disc and analog alike. Indeed,it could be said that Acoustic Suspension has now fully come into its own with digital recording.

FEATURES

Acoustic Blanket™: eliminates cabinet & grill reflections that blur stereo image

Tetra-helix mounting plate: eliminates hi-frequency coloration

Extended bass response: for greater realism

Resonance dissapation grooves: reduce midrange coloration caused by cabinet resonance

Multi-way system: 6" midrange for controlled dispersion & precise imaging

Separate midrange enclosure: for less midrange coloration

Added internal bracing: further reduces cabinet resonances for clearer sound

1" Titanium dome tweeter: increases power handling

Dual woofer, front & rear: to eliminate wall dip

Separate inputs for woofers & upper range drivers: to accomodate bi-wiring/bi-amping


SPECIFICATIONS 910

SYSTEM TYPE: Floorstanding columnar acoustic suspension 4-way system with 5 drive-units in a vertical array with Acoustic Blanket™ for precise stereo imaging with an additional rear firing woofer to eliminste wall dip effects. Also featuring a split crossover network on the woofers and upper midranges for smooth frequency response.

DRIVE UNITS: Two 12" (300 mm) filled polypropylene cone acoustic suspension woofers - one front-firing, one rear-firing. One 8 " (200 mm) filled polypropylene cone acoustic suspension lower midranges, in its own sub-enclosure. Two 6½ " (165 mm) filled polypropylene cone acoustic suspension midranges, each inits own sub-enclosure. One 1" titanium dome liquid-cooled tweeter with tetra-helix mounting plate and acoustic lens.

SENSITIVITY: 90 dB SPL

AMPLIFIER REQUIREMENTS: 400 watts maximum (35 watts minimum per channel)

FREQUENCY RESPONSE: -3 dB (half-power) points at 28 Hz and 32,000 Hz (with an effective Q. of 4 at resonance

IMPEDANCE: 4 ohms nominal (3,2 ohms minimum point)

CROSSOVER FREQUENCT: 200 Hz, 550 Hz, 5500 Hz

CABINET, INTERNAL, VOLUME: 124 litres (4,4 cu.ft)

DIMENSIONS: 1341 x 400 x 470 mm

FINISH: RealAmerican hardwood top and bottom (walnut or oak) with cloth covered and black vinyl veneer cabinet and black cloth space-frame grille

WEIGHT: 63,6 kg (140 lbs.), 69,5 kg (153 lbs.)

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