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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





IMF TLS80 II loudspeakers

Based upon the world acclaimed Reference Standard Professional Loudspeakers, the Monitor TLS80 fulfills the need of the dedicated audiophile for a speaker of comparable quality, but tailored for home use.

Full transmission line loading incorporates new damping materials. Acoustic foam, as used in anechoic chambers, is "sculptured" to produce a wedge effect where the maximum surface area is exposed to damp the line, yet presenting the minimum of restriction. A separate midrange line is similarly terminated whilst standing waves are progressively absorbed by long hair wool. Both a tweeter and a super-tweeter are employed to ensure power handling conducive with wide dispersion and extended response beyond the limits of human hearing. Only a transmission line can provide the dynamic impact experienced in the concert hall. Bass is reproduced within the listening room rather than in a box. If there were a better method of loading, we would have employed it.

The whole system is integrated by a complex crossover, developed as the result of research in depth into the problems of phase correction, impulse response and amplifier matching. A three position "Tilt" control enables the energy response to be modified from nominally flat to "Rise" or "Fall", compensating for the location, the characteristics of ancillary equipment, or even personal preference.

 

 Like the Reference Standard, the speakers are designed to be used on the stands provided. These ensure that the loudspeakers are supported off the floor, reducing room colouration components. Importantly they slightly tilt the speakers back, maintaining a substantially flat response both axially and hemispherically.

 


 There is very little that need be said about the Monitor, which is both neutral yet exciting. Supplied in matched "mirror image" pairs the stereo presentation is stable, portraying great detail with the uncanny ability to reproduce the acoustic environment of the original performance. We suggest that you audition these speakers with the finest ancillary equipment. In the tradition of our monitoring approach to loudspeaker design the TLS 80 is capable of providing greater satisfaction over a wider range of programme material.

 


Specifications

Drive Units

Bass :  300 x 210 mm (11,75" x 8,25") flat polystyrene bass unit loaded by transmission line

Mid :  150 mm (6") plastic cone midrange in separate line

High :  45 mm (1,75") diaphragm high gauss tweeter; 20 mm (0,75") chemical dome super-tweeter

Crossover:  Electrical four way at 350 Hz, 3 kHz and 13 kHz

Frequency Range:  20 Hz to beyond audibility

Control:  Tilt

Matching Impedance:  4 - 8 Ω

Efficiency (Measured via Pink Noise at 1 m for 40 W):  98 dB (dependent on Control setting)

Driving Power Requirement:  40 - 100 watts

Dimensions (W x H x D):  460 x 980 x 410 mm(18" x 38,5" x 16")

Overall height on stand: allow 1070 mm (42")

Weight (Net/ Gross):  37 kg / 45 kg

Stands Weight (Net/Gross):  7 kg (each)/ 20 kg (pair)


 

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