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





Infinity 2000AXT (1973 - 1978)


With its all new drivers and enclosure, coupled with 5dB added efficiency over the 2000 A, we at Infinity feel that the 2000 AXT is the standard against which all others near the price range will be compared.
While it can be driven, with most of today's receivers (20 -25 watts RMS/channel minimum), it also easily accomodates the super power amplifiers which are becoming more popular in today's market.

The tweeter section.
The wave transmission line tweeter is probabyly Infinity's most stunning achievement. It's not a cone or piston drive, not an electrostatic, not a ribbon and not an ionic device. In fact, it really doesn't appear in any textbooks on acoustics.
This Walsh tweeter, acting as a vertical, pulsating cylinder, is a purely coherent source of sound radiation - directly analagous to the light emitted by a laser beam. It, therefore, is transient perfect - a feat which no other speaker has achieved.
The drive mechanism of the tweeter in this case is a voice coil in a very intense magnetic field. This drive mechanism was selected for its simplicity and inherent reliability, although any other drive system could be used inasmuch as the cone is only plucked at the base.
Sound velocities much higher than the speed of sound in air are propagated up the metallic cone. Sound is emitted on various parts of the cone corresponding to the temporal and spatial scheme of Figure 1. Thus,each bit of audio information fed into the device is emitted intact at the same instant of tome. This is true around the entire device, so that 360° coherent rediation is a reality.
This new WTLT tweeter was developed and manufactured by Infinity under license from Ohm Acoustics, and is a newly engineered extension of the Walsh patent No. 3424873.


The midrange section.
the midrange speaker is a very high efficiency 4,5" cone utilizing a large Alnico V magnet, the cone of which is treated for five times the stiffness to massratio of conventional speakers. The resulting clarity and transparency is startling.
The bass section.
The bass driver is a 12" woofer with a full one inch movement capabillity. Its cone is treated twice - once to increase the stiffness to mass ratio by a factor of five, while the second treatment ensures proper cone damping to complement the added stiffness. The woofer is loaded into the "Infiniy transmission line" enclosure for superb bass transients. it accurately reproduces the very lowest fundamental bass frequencies.



SPECIFICATIONS
1 x Walsh WTL Tweeter
1 x EMiT Tweeter
1 x 4" Midrange
1x 10" Q-Woofer
Frequency response: 30 Hz to 21 KHz ± 3,5 dB
Crossover frequencies: 500 Hz, 5000 Hz
Nominal impedance: 8 ohms
Maximum amp power: 200 watts channel program
Minimum amp power: 20 watts RMS channel
Dimensions: 27¾ x 20 x 14 Inch (63,5 x 36,8 x 30,5 cm)
Price: 299,00 $

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